************************************************************************ * * * # # ##### ### ### ### * * # # # # # # # # # XZ80Q * * # # ### # # # # Documentation * * # # # # # # # # ## * * # # ##### ### ### #### * * # * * including documentation for: [sections] * * XZ80Q catalogue [ 1 to 16] * * XZStarNames [17 to 18] * * XZDoubles catalogue [19 to 24] * * XZDoubles Discoveries catalogue [25 to 27] * * XZVariables catalogue [28 to 30] * * XZ Cross-reference lists [31] * * * * together with: * * * Part of the documentation for XZ80P * * * Historical notes concerning the XZ catalogue, * * from the documentation for XZ80N * * * Historical notes concerning the XZ94 * * versions of the XZ catalogue * * * Historical notes concerning the related * * catalogues B+M, C, E, J, K, L * * * * D Herald, Canberra, Australia * * November 2003 * ************************************************************************ ======================================================================== XZ80Q catalogue ======================================================================== 1. Introduction The XZ80Q has been developed from XZ80P, which was created by Mitsuru Soma. The notes to the XZ80P catalogue setting out the changes and corrections made, are included below as part of this documentation. This revision of the XZ80 catalogue is for the following purposes: * to replace the XZ positions obtained from the Tycho-1 catalogue with positions from the Tycho-2 catalogue; * to identify all other XZ stars contained in the Tycho-2 catalogue, (other than those where the XZ80P position was taken from the Hipparcos catalogue) and replace the position with the Tycho-2 position; * to expand the XZ80 catalogue to include a complete coverage of all ecliptic stars of visual magnitude brighter than 12.00 - using the Tycho-2 catalogue; and * to replace the coordinates all stars in the expanded catalogue with coordinates from the UCAC2 catalogue, where available. [Note: the UCAC2 catalogue does not include stars brighter than about magnitude 10.] * to give a more complete coverage of faint stars for lunar eclipse occultations. In the process, various errors - such as duplicate entries - have been identified and corrected as detailed below. In addition, the double star information for use with the XZ catalogue has been completely reworked. See sections 19 to 27 below. A file containing detailed variable star information for use with the XZ catalog has also been created. See sections 28 to 30 below. The Names of stars have been removed from the main catalogue and put into a separate file, with a complete revision of content and formatting (section 31 below). Finally, cross- references have been generated to XZ80Q for a number of special catalogues used in the 1980's and 1990's for occultation predictions of special fields - such as lunar eclipse fields, and rich star regions. XZ80Q is comprised of the following files: MAIN FILES XZ80Q.dat The main catalogue XZDoubles.dat Double star details XZDoubles Discoveries.dat Occultation discoveries of doubles XZVariables.dat Variable star details XZStarNames.dat Names of stars CROSS-REFERENCE FILES AGK3 to XZ80Q.dat Sorted list of AGK3 stars in XZ80Q PPM to XZ80Q.dat Sorted list of PPM stars in XZ80Q SAO to XZ80Q.dat Sorted list of SAO stars in XZ80Q ZC to XZ80Q.dat Sorted list of ZC stars in XZ80Q B_XZ.dat XZ80Q numbers for stars in the "B+M" catalogue C_XZ.dat XZ80Q numbers for stars in the "C" catalogue E_XZ.dat XZ80Q numbers for stars in the "E" catalogue J_XZ.dat XZ80Q numbers for stars in the "J" catalogue K_XZ.dat XZ80Q numbers for stars in the "K" catalogue L_XZ.dat XZ80Q numbers for stars in the "L" catalogue P_XZ.dat XZ80Q numbers for stars in the "P" catalogue Q_XZ.dat XZ80Q numbers for stars in the "Q" catalogue This revision has identified numerous errors in XZ80P and previous versions of the XZ catalogue, and resolved a number of long-standing problems. As a result of this revision, it is believed that all uncertainties about the validity of entries have been resolved. However there should be no implied criticisms of the authors of the previous versions, as the detection and elimination of errors is not a simple matter. It would be far too presumptive of me to suggest that this version is error-free. Indeed, the release of a beta-version of the catalogue (while waiting for the release of the UCAC2 catalogue) led to the discovery of a small number of errors in this compilation, as well as some errors from XZ80P that had not been previously detected. At most I hope that the incidence of errors is extremely small - although that is an assessment that will have to await the effluxion of time. 2. Methodology Historically, the XZ catalogue was created as a compilation of stars from a variety of catalogues. [Some historical notes are given at the end of this file.] The extent of that compilation was increased with Zimmerman's expansions with the XZ94 versions of the catalogue. Unfortunately the inhomogeneous nature of the source catalogues caused a variety of errors. In creating this new expanded version of the XZ catalogue, I have endeavoured to reduce (if not eliminate) these historical problems, by starting with a single catalogue - the Tycho-2 catalogue - as the basis for the catalogue. Ultimately the ordering of the original XZ catalogue has been maintained. However the underlying methodology has been to base the new catalogue on the Tycho-2 catalogue; to compare the existing XZ catalogue with that catalogue; and to investigate the reasons why an XZ star is not in that catalogue. The actual methodology used was: a. An ecliptic subset of the Tycho-2 catalogue was created - limited to visual mag 12.00, and stars with an ecliptic latitude of less than 6d 40'. This subset was sorted by J2000 Right Ascension. b. The XZ catalogue was sorted by J2000 Right Ascension. Stars with an ecliptic latitude greater than 7d were identified - for subsequent flagging as being outside the ecliptic. [6d 40' is the actual limit of the region that the moon can cover. The limit of 7d was maintained for existing XZ stars in part to allow for the effects of stellar proper motion over historical epochs. For example, the star Pollux cannot now be occulted, but it could before 60BC.] c. Each star in the sorted XZ catalogue was matched to all stars in the Tycho-2 ecliptic subset having a difference in position <15", AND to any other XZ star <8". Matches were listed giving both separation distance, and magnitude difference. In practice, the largest 'true match' distance was 8.4", and only a small number were larger than 3". Large match distances were usually associated with an erroneous large proper motion in one or both of the XZ cordinates. d. When more than one Tycho-2 star matched, the match was usually allocated to the brighter Tycho star, unless the fainter star matched better than about 0.5" and the brighter star >1". [In subsequent work with the double star file, it became apparent that occasionally the brighter Tycho-2 star did not correspond with the 'A' component of the double star.] e. The list of matches was visually inspected (using a spread-sheet to readily sort by different parameters) to check all matches with separation >3.0" (~75 stars), and to investigate all instances where a Tycho-2 star was matched to more than 1 XZ star. Several erroneous matches in XZ80P to Tycho were identified in this process. Also one bad match to Tycho-2 was identified, arising from erroneous proper motions in XZ80P. f. A list of all stars in XZ that did not have a match in Tycho-2 was created. All stars with magnitude <9.5 were investigated - with causes being identified with variability, and (more commonly )with erroneous coordinates. Where a match was identified, the star was entered in the list of matched stars, or a list of duplicate entries. g. Steps a, c to f were repeated by extracting a Tycho-2 subset of stars fainter than 12.00 within 6d 40', and of all Tycho-2 stars between 6d 40' and 7d. Stars which matched in coordinates but had a large magnitude difference (generally >2) were excluded as a match. [This whole step was included merely to ensure that existing XZ stars would have Tycho-2 coordinates rather than the previous coordinates; stars fainter than 12.00, and >6d 40' from the ecliptic, are not otherwise added to the catalogue. Note that most of the present XZ stars fainter than 12.00 are in the region of the Pleiades.] h. The XZ80Q catalogue was created using the list of matches to control whether the Tycho-2 data was used to replace an XZ position with the Tycho-2 data, or to add a new star to the XZ catalogue. This update process did not replacing existing Hipparcos-based positions in XZ (except for two erronoeus identifications), but over 400 Hipparcos stars were added to the catalogue. Existing stars identified as erroneous, duplicate entries, or having a latitude greater than 7d, were marked. In this process, magnitudes derived from Tycho-2 were used in place of any existing magnitudes (except for Hipparcos stars). The Tycho-2 magnitudes were converted to Visual (Mv) and Photographic (Mp) magnitudes using: Mv = 1.09 * VT - 0.09 * BT Mp = 0.76 * BT + 0.24 * VT where VT and BT are the Tycho magnitudes of that label. If either VT or BT was not given then: Mv was set to whichever of VT or BT was given; and Mp was set to BT (if given), or left blank. i. BD/CD/CPD numbers were added. To do this, the BD, SD, CD and CPD catalogues were accessed from the electronic version available from the Astronomical Data Centre on the CD 'Selected Astronomical Catalogs Volume 2'. The entries were precessed (from 1855 or 1875, as required) to 2000, and a subset of all entries within 7d of the ecliptic created. All BD etc nos in XZ80P were then flagged in this subset, following which it was sorted into Right Ascension order for J2000. For all entries in XZ80Q that did not have a BD etc number, a search in the subset for a match was conducted - with a match being indicated where the coordinates agreed to better than 1.0 arc min in both RA and Dec (with the star not being already included in XZ80P). Where more than one match meeting this criterion was found, the closest match was taken to be the match. The average match distance was 0.3', and there were 24,706 matches. These BD numbers were then added to the XZ80Q file. Where the same BD number was matched to more than one XZ star, the codes 'p' and 's' were added [consistent with their use in XZ80P.] j. The newly created XZ file was compared to the UCAC2 catalogue. XZ positions taken from Hipparcos were not replaced. Tycho-2 positions were replaced if the UCAC2 position was within 1" and the magnitude difference <2.5. (No magnitude limit was placed on the UCAC2 catalogue when searching for a match.) Positions sourced from other catalogues were replaced if the UCAC2 position was wihin 10", and the magnitude difference <2.5. If under these criteria a UCAC2 star was matched to more than one star, it was not used to replace the coordinates of either star. Note that the UCAC2 catalogue was used only to replace coordinates; no magnitudes were taken from that catalogue. k. The catalogue was extended beyond the Tycho-2 coverage for faint stars that might be observed during a lunar eclipse. This extension is limited to an ecliptic latitude of +/- 1.5 deg, and is based upon the UCAC2 catalogue. It includes all stars in that catalogue brighter than mag 12.50 - noting that the UCAC2 magnitude is uncertain by ~0.2 mag, and is somewhat redder than V. A UCAC2 star was not added if (i) it had been matched in step (i) with an XZ80Q star, or (ii) it was within 10" of an XZ80Q star. The eclipse extension is added as a separate block at the end of the Tycho additions, starting at number 187165. l. The field for star names was reduced to a single character flag for the existence of star names, with all star names being moved to a separate file. m. The catalogue was compared with XZ80N, to identify stars that had been incorrectly matched when XZ80P was created - and the cross-references to other catalogues for those stars adjusted. n. Finally, cross-reference lists into the XZ catalogue were generated for SAO, ZC, PPM and AGK3 stars. Also, cross-references lists were generated for certain catalogues specially created during the 1980's and 1990's for lunar eclipses and passages lunar passages through rich star fields. 3. Statistics The XZ80Q catlogue has 244051 stars and 244437 records. The number of stars by source catalogs are given in the following table. Source catalogue Number ------------------------------- UCAC2 169261 UCAC2 eclipse ext. 57265 Hipparcos 12255 Tycho-2 3337 Tycho-2, no pm 384 Tycho-2 supplement 1102 Tycho-2, mean pm 365 PPM main 16 PPM Supplement 8 Pleiades 54 ACRS1 2 Lick Voyager 1 AGK3 1 null/deleted entry 386 =============================== Total 244437 =============================== The 82 residual XZ stars sourced from 'old' catalogues are: a. PPM stars 758 3267 3974 4906 5857 8820 10222 13417 13419 32772 37954 39450 41627 44527 52058 53358 b. PPM Supplement stars 43724 44423 44483 46456 46553 46901 47445 48276 c. ACRS stars 38762 45070 d. Pleiades stars 33118 33119 33124 33126 33138 33144 33147 33151 33154 33160 33162 33165 33166 33169 33170 33172 33176 33181 33182 33199 33201 33205 33207 33216 33217 33223 33224 33229 33230 33239 33244 33247 33262 33286 33287 33291 33296 33299 33300 33306 33310 33317 33329 33349 33379 33431 33437 33445 33480 33483 33497 33508 33514 33526 e. Other catalogues 33721 (AGK3) 37032 (Lick Voyager) More details concerning these stars are given in section 15. The numbers of stars in half-magnitude ranges ENDING on the specified Mv magnitude are given in the following table. The line 'Main' refers to the catalogue excluding the lunar eclipse extension. The line 'Ext' is for the entire catalogue. =========================================================================== 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 Ext 0 2 3 2 2 14 10 27 55 89 132 248 --------------------------------------------------------------------------- 6.5 7.0 7.5 8.0 8.5 9.0 9.5 10.0 10.5 11.0 11.5 12.0 Main 419 720 1190 2010 3234 5268 8597 13916 22117 33490 50701 44200 Ext 419 720 1190 2010 3234 5268 8599 13926 22239 34584 56786 62311 --------------------------------------------------------------------------- 12.5 13.0 13.5 14.0 14.5 15.0 15.5 Main 103 99 80 36 9 2 1 Ext 31952 99 80 36 9 2 1 =========================================================================== Note that there are 2 stars in XZ80Q with no visual magnitude. They are 38762 and 51171. These statistics show that stars sourced only from UCAC2 are in the magnitude range 9.1 to 12.5, with most being fainter than 11.0. These statistics are consistent with the catalogue being 'complete' in the sense of containing almost all stars, to about mag 11.8, with a sharp cut-off at mag 12 (or mag 12.5 for the eclipse extension). By way of contrast, XZ80P is 'complete' to about mag 9.5. However, it does not have a sharp magnitude cut-off, and has a significant number of stars up to about 11.5. 4. Format of the Catalogue The format of the catalogue has been maintained almost unchanged from that of XZ80P. The principal differences are: a. Deleting the character "X" from the first column, and using that column for an extra digit in the star number; b. Using only column 18 for a double star code, and using column 19 for a variable star code; c. Formatting the number for Tycho stars (columns 118-129) as per the recommended Tycho format; d. Including a code and number format in columns 117-129 for stars in the UCAC catalogue; and e. New codes in columns 178 & 179 for Tycho source catalogue details; and f. Replacement of the 25 character field for the star name with a single character field for a flag for the existence of a star name. The catalogue is formatted with a fixed record length of 182 characters, with characters 181/182 being a Carriage Return / Line Feed sequence. A record exists for all possible XZ numbers, so that the record number is the same as the XZ number. A byte-by-byte description of the XZ80Q catalog is given below. The Format column gives the field format in Fortran notation, as for XZ80P. For stars of numbers beyond X32221, the sources of magnitudes, parallax, etc., and the information that was not included in XZ94F (e.g. HD numbers) are not indicated (the bytes for them are all blank)unless it was available in the Tycho-2 catalogue. Byte(s): (Format) Description 1- 6: (I6) [1-244437] XZ number 7- 8: (A2) [BD,SD,CD,CP] Durchmusterung (DM) identifier ("X " for deleted stars, see Sect. 11) 9- 17: (A1,I2,I5,A1) DM zone and number (alternative XZ number for deleted stars, see Sect. 11) 18: (A1) [CcDdWwMS] Double star code (DSC), with the following meaning C = double, component in XZ80Q, Separation <1" c = double, component not in XZ80Q, Separation <1" D = double, component in XZ80Q, Separation <10" d = double, component not in XZ80Q, Separation <10" W = double, component in XZ80Q, Separation >10" w = double, component not in XZ80Q, Separation >10" M = multiple system, all components in XZ80Q S = multiple system, some but not all in XZ80Q 19: (A1) [EeVvSs] Variable star code, with the following meaning E = eclipsing-type variable, magnitude variation >0.5 mag e = eclipsing-type variable, magnitude variation <0.5 mag V = other variable, magnitude variation >0.5 mag v = other variable, magnitude variation <0.5 mag S = suspected variable, magnitude variation >0.5 mag s = suspected variable, magnitude variation <0.5 mag 20- 24: (F5.2) V magnitude 25: (A1) [ THX] V magnitude source flag (blank= Johnson V from HIP, T= Johnson V computed from VTmag and BTmag from TYC, H= Hpmag from HIP, X= visual from XZ80N, U= Internal UCAC2 magnitude (red bandpass)) 26- 36: (I2,I2,F7.4) Right ascension (hms), epoch and equinox J2000.0, ICRS for HIP and ACT stars, FK5 for others 37- 44: (F8.4) Proper motion in right ascension (s/cy) 45- 55: (A1,I2,I2,F6.3) Declination (d'"), epoch and equinox J2000.0, ICRS for HIP and ACT stars, FK5 for others 56- 63: (F8.3) Proper motion in declination ("/cy) 64- 66: (F3.0) Trigonometric parallax (mas) 67: (A1) [ X] Trigonometric parallax source flag (blank= from HIP, X= from XZ80N) 68- 73: (F6.1) Radial velocity (km/s) 74: (A1) [ X] Radial velocity source flag (blank= form HIC, X= from XZ80N) 75- 78: (F4.0) Standard error in RA*cos(Dec) at source epoch (mas) 79- 82: (F4.0) Standard error in PM in RA at source epoch (mas/cy) 83- 86: (F4.0) Standard error in Dec at source epoch (mas) 87- 90: (F4.0) Standard error in PM in Dec at source epoch (mas/cy) 91- 97: (F7.2) Source epoch (yr) 98-102: (F5.2) B magnitude 103: (A1) [ B] B magnitude source flag (blank= Johnson B from HIP, B= Johnson B computed from VTmag and BTmag from TYC, T= BT from TYC) 104-115: (A12) Spectral type 116: (A1) [ X] Spectral type source flag (blank= from HIP, X= from XZ80N) 117-129: HIP number and flags, TYC ID, or UCAC1 ID For HIP stars 117: (A1) 'H' 118-123: (I6) [1-120416] HIP number 125: (I1) [1-4] Sequential number for the same HIP number given in HIP double/multiple systems annex [5-8] 5 = 1+2; 6 = 1+3; 8 = 2+3 126: (I1) [1-4] Number of stars with the same HIP number given in HIP double/multiple systems annex (bytes 125-126 are given for stars of byte 127=C) 127: (A1) [CGOVX] Double/multiple systems flag indicating further details are given in HIP annex: C= solutions for the components G= acceleration or higher order terms O= orbital solutions V= variability-induced movers X= stochastic solution 128: (A1) [FIL] Type of solution: F= fixed double or multiple system (identical proper motions and parallaxes), I= individual parallaxes and linear (relative) motion (possible optical double star) L= linear double or multiple system (may have different proper motions but assumed to have same parallax) 129: (A1) [ABCDS] Double/multiple star solution quality (A=good, B=fair, C=poor, D=uncertain, S=suspected non-single) For TYC stars 117: (A1) 'T' 118-129: (A12) TYC ID [rrrr-nnnnn-c] where rrrr is the GSC region, nnnnn is the GSC number in the region, and c is the component number. For UCAC stars 117: (A1) 'U' 118: (I1) UCAC version number 121-128: (I8) UCAC sequence number 130-139: (A10) CCDM identifier 140-141: (A2) CCDM component identifiers 142-147: (I6) SAO number 148-151: (I4) ZC number 152-157: (I6) PPM number 158-166: (A1,I2,I5,A1) AGK number 167-172: (I6) HD number 173-177: Flags for HIP and TYC stars For HIP stars (these are not given for components of double/multiple stars) 175: (A1) [CDMPRU] Variability type: C= no variability detected ("constant") D= duplicity-induced variability M= possibly micro-variable (amplitude < 0.03mag) P= periodic variable R= V-I color index was revised due to variability analysis U= unsolved variable which does not fall in the other categories 176: (A1) [12] Additional data about variability given in HIP annex For TYC stars 173: (A1) [ X] Reference flag for astrometry: blank= a recommended astrometric reference star X= a dubious astrometric reference star in TYC 174: (I1) [1-9] Astrometric quality flag: 1 through 5= very high to medium quality; probably single stars 6= perhaps non-single 7= low astrometric quality 8= perhaps non-stellar 9= very low astrometric quality 175: (A1) [GN] Known variability from GCVS/NSV: G= star in General Catalogue of Variable Stars, 4th Edition N= star in New Catalogue of Suspected Variable Stars 176: (A1) [UVW] Variability from TYC: U= apparent variability in TYC data; may be due to duplicity V= strong evidence of variability in the TYC data W= variability suspected in the TYC data 177: (A1) [DRSYZ] Duplicity from TYC: D= duplicity clearly indicated (BTmag and VTmag refer to combined light) R= duplicity weakly indicated, combined with indication of variability S= duplicity suspected Y= investigation of duplicity made, no indication of duplicity Z= no investigation of duplicity was performed 178-179: (I2) Source code for position and proper motion: 01= HIP 06= PPM 07= ACRS1 09= Others (P70, K, AGK3, PCAT, LV, SAO90, L, CBSC, GC) 11= Tycho-2 12= Tycho-2 - with proper motion being for the mean position of a close pair 13= Tycho-2 - with no proper motion. Position is for epoch 14= Tycho-2 Supplement 1 15= UCAC 180 : (A1) [N] Flag for existence of names for the star in XZStarNames.dat blank= no star name N= star name(s) in XZStarNames.dat file 5. Latitude limit of the XZ80 catalogue The maximum ecliptic latitude for which a star can be occulted by the moon as seen from somewhere on the Earth, is 6deg 40'. This value was used for selecting the extra Tycho stars to be added to the catalogue. [However, the coordinates of stars with a latitude in the range 6d 40' to 7d were replaced with Tycho-2 coordinates.] The latitude limit applied for the creation of the XZ94F catalogue was 7deg 0'. At an earlier development of the XZ catalogue a number of stars having a latitude much greater than 7deg (up to 11 degrees) were erroneously included. The catalogue was scanned to identify and remove all stars having a latitude greater than 7 degrees. These stars have been marked as deleted by the entry consisting of just the XZ number, an "L" in the first location of the DM number [to indicate the record is empty because of (L)atitude], the visual magnitude set to 40.0, and a declination of -90 deg. The stars that have been deleted are: * Ecliptic latitude north of +7d 0'[6 stars] 32995 33062 33565 33820 33860 33888 * Ecliptic latitude south of -7d 0' [162 stars] 1260 1272 1290 1316 1331 1352 1361 1366 1429 1443 1456 1497 1508 1517 1525 1529 1540 1542 1555 1594 1596 1600 1625 1629 1640 1641 1643 1678 1679 1722 1723 1764 1765 1767 1784 1808 1840 1849 1868 1876 1895 1897 1909 1958 1996 2018 15769 15784 15810 15813 15822 15879 15910 15920 15930 15932 15941 15945 15964 15971 15989 15999 16026 16035 16038 16039 16046 16049 16053 16065 16087 16091 16099 16117 16123 16125 16133 16134 16147 16149 16158 16165 16169 16178 16184 16208 16212 16215 16228 16233 16236 16246 16248 16254 16256 16258 16274 16290 16312 16315 16317 16337 16343 16356 16363 16364 16368 16369 16387 16389 16395 16396 16402 16409 16411 16421 16423 16425 16429 16433 16439 16448 16453 16477 16490 16505 16514 16527 16560 16568 16569 16570 16586 16592 16597 16599 16603 16616 16637 16640 16651 16684 16694 16696 16697 16718 16719 16752 16770 16775 16824 16853 37787 37854 40012 40261 42003 42078 42484 44742 46319 50486 6. False entries The following 5 stars were sourced from a version of the Perth70 catalogue - but their Right Ascension at 1950 was 0hrs exactly. The stars do not exist in other catalogues, and are clearly false entries. They have been marked as empty by the entry consisting of just the XZ number, an "E" in the first location of the DM number [to indicate the record is an (E)mpty record], the visual magnitude set to 40.0, and the declination set to -90 deg. 32338 32339 32340 32341 32342 The following stars have also been deleted as non-existent - see section 15(g) below. 32998 33035 33617 54008 7. Empty entries The XZ catalogue has a number of entries that have never contained data. These entries were not included in either XZ80P or XZ94F. In this version, the empty records are included. Such entries have been marked as empty by the record consisting of just the XZ number, an "E" in the first location of the DM number [to indicate the record is (E)mpty], the visual magnitude set to 40.0, and a declination of -90 deg. The empty records are: (i) the gap between the original XZ80 catalogue, and the additions made in XZ94 - XZ numbers 32222 to 32300 [But note section 8 below, for some entries transferred to 32222 to 32225.] (ii) stars sourced from the "J" catalogue only, added in XZ94A, but subsequently removed in XZ94E (and not included in XZ94F and XZ80P) 32463 32922 32990 33611 33774 33806 33831 33840 33842 33949 33958 33994 34013 34075 34078 34107 34284 34310 34551 34764 34779 34780 34782 34784 34785 34788 34789 34792 34793 34794 34796 34801 34802 34803 34804 34806 34807 34813 34814 34821 34823 34825 34828 34831 34833 34843 34843 34845 34846 34847 34853 34858 34860 34861 34862 34864 34868 34869 34873 34874 34875 34880 34882 34883 34888 34889 34891 34896 34898 34901 34905 34908 34924 35490 43298 43852 47858 48663 53999 54000 54010 54059 8. Misidentification of Hipparcos stars in XZ80P Four misidentifications were identified in the matching of the Hipparcos catalogue to XZ80. They all involve a Hipparcos star which is a close double, and two entries in the XZ catalogue having a separation of about 1 arcmin - with both stars having a separate entry in the SAO catalogue. In each instance, XZ80P has identified one star as being a close companion of the other - but that star is now found to have a separate entry in Tycho-2. Occultations of these stars have not yet occurred since the distribution of the XZ80P catalogue. 6037 was incorrectly identified as a component of the system of 6040 (= H21881) with a separation 0.2". In fact 6037 is around 50" north of 6040. The XZ80P Hipparcos-based entry of 6037 was moved to the previously empty entry 32222, and Tycho-2 was used for 6037. [The last series of occultations of this star ended in Sept 1993; the next series starts in May 2002.] 6607 was incorrectly identified as a component of the system of 6608 (= H24047) with a separation 0.5". In fact 6607 is around 75" north of 6608. The XZ80P Hipparcos-based entry of 6607 was moved to the previously empty entry 32223, and Tycho-2 was used for 6607. [The last series of occultations of this star ended in August 1991; the next series starts in September 2004.] 7633 was incorrectly identified as a component of the system of 7631 (= H27241) with a separation 0.1". In fact 7633 is around 90" south of 7631. The XZ80P Hipparcos-based entry of 7633 was moved to the previously empty entry 32224, and Tycho-2 was used for 6037. [The last series of occultations of this star ended in March 2001.] 8448 was incorrectly identified as a component of the system of 8446 (= H29224) with a separation 0.6". In fact 8448 is around 34" north of 8446. The XZ80P Hipparcos-based entry of 8448 was moved to the previously empty entry 32225, and Tycho-2 was used for 8448. [The last series of occultations of this star ended in April 1989; the next series starts in February 2005.] The investigation of the double star catalogue led to the identification of the following mis-identification. However, the XZ80P positions have been retained. 629 was incorrectly identified as a component of the system of 628 with a very small separation. The star corresponding to 629 in XZ94 and previous versions of XZ80 is now 55740. The following stars involve the incorrect identification of a Hipparcos star with an XZ star, with no other star in XZ80P corresponding to the incorrectly allocated star. A star added in the creation of XZ80Q corresponds to the star that was listed in XZ80N. The star allocation made in XZ80P has been retained for these stars, but the cross-reference stars have been moved to the XZ80Q star corresponding to the XZ80N star. The stars, and the cross-reference stars, are: | Xref data moved to the XZ80Q star XZ80P XZ80Q | SAO ZC PPM AGK3 HD 1348 57193 | 144157 +09 82 5901 2226 59230 | 144789 +07 177 9817 3549 62926 | 93035 118412 +14 238 16497 3591 63046 | 118448 +18 205 16694 8163 81874 | 95295 +24 598 250757 22139 135756 | 159763 231334 145502 9. Mis-identification of Tycho stars in XZ80P The following identifications involve incorrect identification of a Tycho star with an XZ star, with another XZ star in XZ80P corresponding to the incorrectly allocated Tycho star. They typically arose from a 'poor' match with Tycho-1, with the 'proper' match being in Tycho-2. The XZ number that properly corresponds to the incorrectly allocated Tycho number is given in brackets. 16361 = TYC 0852-00927-1 [ 54020 = TYC 0852-00660-1] 22473 = TYC 6800-01672-1 [ 41235 = TYC 6800-00626-1] 24471 = TYC 6850-02660-1 [ 43260 = TYC 6850-03214-1] 25309 = TYC 6869-00065-1 [ 44032 = TYC 6869-00453-1] 25562 = TYC 6862-00252-1 [ 44291 = TYC 6862-00206-1] 26323 = TYC 6290-01734-1 [163523 = TYC 6290-02567-1] 26558 = TYC 6874-00285-1 [165346 = TYC 6874-00239-1] 26894 = TYC 6301-01955-1 [ 46854 = TYC 6301-01599-1] 27535 = TYC 6312-00585-1 [ 46854 = TYC 6312-00761-1] 31706 = TYC 5251-00874-1 [ 53581 = TYC 5251-00106-1] The following stars involve the incorrect identification of a Tycho star with an XZ star, with no other star in XZ80P corresponding to the incorrectly allocated star. A star added in the creation of XZ80Q corresponds to the star that was listed in XZ80N. The star allocation made in XZ80P has been retained for these stars, but the cross-reference stars, and any XZ80N spectral type, has been moved to the XZ80Q star corresponding to the XZ80N star. The stars, the cross-reference stars, and the spectral type, are: | Xref data moved to the XZ80Q star XZ80P XZ80Q | SAO ZC PPM AGK3 HD Spec 5182 68280 | 76363 93130 +25 384 A2 6623 72875 | 120672 +16 438 K5 7606 77961 | 77564 879 94877 +20 565 7797 79349 | 94957 121533 +18 514 B9 7881 79958 | 77731 95096 +25 582 K0 7922 80220 | 121633 +18 524 F8 8425 83672 | 95504 +24 618 8448 83853 | 78048 95524 +29 670 42033 8809 86321 | 95787 +23 649 255134 A0 9262 89501 | 78474 96127 +20 696 G5 10860 100101 | 79269 97343 +24 822 F2 11248 102419 | 79478 97631 +27 817 F5 11672 104763 | 79686 97948 +20 891 F0 11786 105330 | 97306 124514 +17 823 11832 105636 | 98086 +25 914 A 12975 110425 | 97932 125444 +18 877 13065 110725 | 97987 125511 +12 1055 F 13376 111713 | 98135 125763 +19 909 G5 15552 118080 | 156766 +07 1424 F8 21165 131945 | 183368 2188 264092 136032 A2 21798 134510 | 183903 264831 K0 23103 139979 | 160304 232652 F8 24130 145447 | 185888 267460 B8 24319 147237 | 186043 267614 A5 24370 147758 | 160985 233894 K 24633 150153 | 186312 267891 B5 24658 150395 | 186335 267917 313828 B5 24846 152429 | 186482 268068 G5 25015 154366 | 161282 234311 M2 25411 157772 | 186913 A2 25481 158201 | 186970 268578 G5 25776 159947 | 187204 268822 K0 26997 168110 | 162623 235997 K 27125 168757 | 188227 269893 A0 31785 186161 | 146822 207786 G2 10. Duplicate entries The following duplicate entries were identified. Those marked [Z] were seperately identified by Wolfgang Zimmerman [the author of the XZ94 versions of the XZ catalogue]. Those marked [L] have a latitude greater than 6d 40' and less than 7deg. Those marked [G] were found following a comparison with the Guide Star Catalogue of stars not matched in Tycho-2 or UCAC. The star in the first column has been marked in XZ80Q as the duplicate, by giving the XZ number of the correct star in the BD column, and setting the declination to -900000.0. 31264 = 31265 32385 = 64 32728 = 1195 33185 = 33184 Z 33658 = 72279 G 33663 = 72495 G 33683 = 73403 G 33686 = 73438 G 33689 = 73575 G 33692 = 73663 G 34313 = 16397 37102 = 37101 Z L 54001 = 1036 Z 54003 = 2432 54005 = 3943 [But both entries retained. See notes] 54006 = 4534 54007 = 6721 Z 54009 = 8083 Z 54011 = 10337 Z 54012 = 10963 Z 54014 = 12009 Z 54015 = 12393 54016 = 12632 54021 = 16801 54022 = 34356 54029 = 18886 54034 = 21252 Z 54041 = 22339 Z 54044 = 23014 Z 54045 = 23278 54056 = 43153 Z L 54057 = 43153 Z L 54061 = 25154 Z 54066 = 26057 Z 54070 = 26523 Z 54083 = 28737 Z 54084 = 28741 Z 54087 = 30683 54093 = 31955 Z 54094 = 32159 Z Notes: 31264 = 31265 : This pair is mentioned in the Notes to XZ80P under 'PPM Numbers'. Although the stars are close, the pair is not in WDS2001, nor Tycho-2. Positions are coincident (to 0.2") at 1945, the epoch for 31264. Spectral type is listed as K0 for both stars. GSC has only one entry : G524200765 10.9 23 5 46.224 - 0 31 10.60 which is consistent with 31265. Difference in positions at 2000 corresponds to difference in proper motions as between AGK3 and PPM. 33658 = 72279 : XZ94/XZ80P proper motions of -0.977s, -881" in error 33663 = 72495 : XZ94/XZ80P proper motions of -1.801s, -878" in error 33683 = 73403 : XZ94/XZ80P proper motions of -66.124s, -1" in error 33686 = 73438 : XZ94/XZ80P proper motions of -65.261s, -4" in error 33689 = 73575 : XZ94/XZ80P proper motions of +.562s, -883" in error 33692 = 73663 : XZ94/XZ80P proper motions of -1.922, -11" in error 54005 = 3943 The star is a close double [0.1"], with each component being in Tycho-2. While the original XZ positions were for the same star, the Tycho-2 positions have been allocated against the two numbers. 54015 = 12393. 12393 is a close double and variable. 54015 appears to be a low-precision reference to 12393. 54045 is a low-precision position of the bright double 36 Oph. 54087 = 30683. 30683 is a close double (with faint ternary) and variable. 54087 appears to be a low precision reference to 30683. 11. Special matches The following stars were matched only after detecting improbably high proper motions. 33032 = TYC 1783-01060-1, XZ94/XZ80P proper motion in Dec in error (34"/cy) 33735 = TYC 1866-01143-1, XZ94/XZ80P proper motion in Dec in error (175"/cy) 33822 = TYC 1332-00472-1, XZ94/XZ80P proper motion in Dec in error (-32"/cy) 33836 = TYC 1892-00085-1, XZ94/XZ80P proper motions of -27.394, -14" in error 33937 = TYC 1922-00176-1, XZ94/XZ80P proper motion in Dec in error (121"/cy) 34183 = TYC 0829-01136-1, XZ94/XZ80P proper motion in RA in error (38s/cy) 16894 = TYC 0274-00473-1 The documentation for XZ80P states for this star: "X16894. This is AG+03 1526, but the Dec was given as -03 deg at J2000 in XZ80N. The PMs in RA and Dec were also erroneous (very large). It was not in AGK3, but was in AGK2. The data in XZ80P were obtained from the AGK2 data by assuming zero PMs in RA and Dec, and 9.999"/cy was assigned to the errors in PMs." It can additionally be noted that AGK2 did not extend to -3 deg. The identification for this star was made using the AGK2 position given in XZ80P. The Tycho star has high proper motion (-4.3s, -21") which gives the AGK2 position of the star at the AGK2 epoch. The Tycho magnitudes are consistent with the spectral type M2 listed in XZ (from AGK2?). The out-of-sequence location of the XZ number is due to the erroneous position used in XZ80N. No explanation for the erroneous XZ80N position is apparent. 12. Correction of PPM and AGK3 entries 1195 and 2392 are both doubles with the companion being in the PPM. XZ94 incorrectly identified these stars in the PPM, with the 'correct' star being added - as 32728 and 32876 respectively. XZ80P corrected the entries for 1195 and 2392 - but not for 32728 and 32876 (which appear as duplicate entries in XZ80P). These entries have been corrected to insert the PPM position for 32728 and 32876. The correct identifications (consistent with XZ80N) are: 1195 = PPM 144044 = TYC 0605-00669-1 ; 32728 = PPM 144043 2392 = PPM 144907 = TYC 0035-00076-1 ; 32876 = PPM 144906 The catalogue was checked for the existance of duplicate entries of the cross-references to the SAO, ZC, PPM, and AGK3 catalogues. One duplicate entry was found: AGK3 +01 121 was allocated in XZ80P to both 1439 and 32772. The correct AGK3 number for 1439 is +01 122. 13. Correction of BD numbers XZ No. BD in XZ80P Correct BD Notes 45070 CD-2713379 CD-2713381 (26120=CD2713379) 14. Matching to the UCAC2 catalogue The UCAC2 catalogue does not contain stars brighter than about mag 10. It also does not include stars where positional information is suspect - for example, for close double stars. The criteria for replacing coordinates in XZ catalogue with UCAC2 coordinates are as follows: a. No Hipparcos positions were replaced; b. If a Tycho position was available, the UCAC2 position must agree to <1" in position, with a magnitude difference of <1. c. If the XZ position was derived from another catalogue, the position must agree to <3", with a magnitude difference <2.5 [in recognition of likely inaccuracies in the proper motions and magnitudes of the source catalogues used in XZ.] d. If a UCAC2 star was matched to more than 1 XZ star (including Hipparcos- based entries), the UCAC2 position was not used for either star. e. The UCAC2 magnitude was not used to replace the magnitude for any star - but was used when no other magnitude was available. The duplicates identified at step (d) were caused by either (i) close stars with separate entries in Tycho-2, or (ii) close stars with separate Hipparcos and Tycho-2 positions. This latter group may constitute duplicate (or erroneous) entries in Tycho-2 - but no attempt has been made to remove either entry from the XZ catalogue. All stars that had not been matched to either Hipparcos, Tycho-2, or UCAC2 were individually compared manually against the UCAC2 catalogue. The following XZ stars were matched to a UCAC2 star following allowance for proper motion errors, or large magnitude differences. (The UCAC2 magnitude has NOT been inserted.) 5126 5667 8659 18209 20056 20501 34356 34364 45115 45433 48551 15. Investigation of stars not matched to Hipparcos, Tycho-2 or UCAC2 As a final check for validity of the entries in the catalogue, all 82 stars sourced from catalogues other than Hipparcos, Tycho-2, or UCAC2 were matched against the Guide Star catalogue (v1.1), with the following results. These stars were also checked against the files of historical occultation observations - with the stars that have been reported in an occultation (1623 - 2000) being marked with an asterisk (*). a. Double star, with or without the companion being in XZ (16 stars) 758* 3267 3974* 4906* 5857 8820 10222 13417* 13419* 32772* 33262 33299* 33349* 33508* 38762* 39450 Notes: 38762 Companion to 20817. Not given in GSC. Proper motions [+.301s, +12.48"] compared to PM for 20817 [-0.7249s, -6.153"] are inconsistent with double star measurements from 1831 to 1968 [STF1894 AB] which show little change [PA constant at 39d, Sep increasing from 19.5 to 19.8] The one observed event involving this star was reported as R2141 (and was matchd to X38762 because of bad residuals). b. Faint stars in the Pleiades region - present in the GSC (48 stars) 33118 33119 33124 33126 33138 33144* 33147 33151 33154* 33160* 33162 33165 33166 33169 33170 33172* 33176* 33181 33182 33199* 33201* 33205 33207* 33216* 33217* 33223 33224* 33229 33230* 33239* 33244 33247 33286* 33287* 33291 33296 33306 33310 33317 33329 33379 33431 33437* 33480 33483 33497 33514 33526 c. Faint stars in the Pleiades region - NOT present in the GSC (2 stars) 33300 33445 d. Variable star (not in the GSC) (1 star) 33721 = GPTau SRB 11.2 to 11.7 period 90 days, spectral type M7 e. Star is present in the GSC, but is flagged as possibly non-stellar. Inspection of Palomar Sky Survey plates indicates double star (7 stars) 44423 44483 44527 46553 46901 48276 52058 f. Star is present in the GSC (8 stars) 37032 = Lick Voyager L11132 = G497400358 (mag 13.5 XZ=13.4) 37954 = PPM 197533 = G556300364 (mag 11.8 XZ=9.5) 41627 = PPM 266119 = G623001209 (mag 10.8 XZ=10.7) 43724 = PPM 733857 = G685601761 (mag 10.2 XZ=9.9) 45070* = ACRS1 1192751 = G686801592 (mag 9.6 XZ=9.7) 46456 = PPM 720840 = G630700088 (mag 10.1 XZ=10.1) 47445 = PPM 721401 = G631801324 (mag 12.5 XZ=9.7) 53358 = PPM 241528 = G582500968 (mag 11.3 XZ=9.5) g. Star is NOT present in the GSC. No star visible in Palomar Sky Survey at the position of the star. Star deleted. (4 stars) 32998 Curiously, the position is (to 0.12 sec in RA and 0.8" in Dec) half-way between the Tycho stars 1229-01154-1 and 1229-01752-1 (10.4, 10.7 Separation approx. 3 arcmin). The star is sourced in AGK3, but is not in PPM. 33035 star is sourced from AGK3, but is not in PPM. 33617 star is sourced from AGK3, but is not in PPM. 54008 . 16. Some odd triplets. When reworking the double star data, several instances were identified where three stars were listed as close together, in a straight line, and with similar magnitudes. In toe of the instances there was a match in UCAC2 to two of the stars in the triplet. In the third, there was no match in UCAC2. In some of these instances there is a corresponding WDS2000 entry for the star, showing it as a double, not triple. It would seem possible that these triple entries are instrumental errors, and that one of the XZ entries is a false entry. These XZ triplets, with the stars not matched in UCAC2 marked with an '*', are (in order of RA): 63263* 63264 63265* 102648* 102652* 102653* 170438* 27435 170439* ============================================================================ XZStarNames.dat ============================================================================ 17. Star names The predecessor XZ catalogues included a 25-character field for any names of the star. The names included proper names, Bayer letters, Flamstead numbers, variable identifiers, and the numbers in the catalogues of Bode, Gould, and Hevelius. For many stars the size of this field was insufficient for the information. This 25-character field has been replaced with a single character field used to indicate the existence of a name for the star, and a separate file - XZStarNames.dat - containing the star names. ************** Acknowledgement: Eric Limburg provided valuable assistance in revising the names for XZStarNames.dat. ************** Where a star has one or more names in XZStarNames.dat, that fact is indicated in column 200 with the character 'N'. XZStarNames.dat has been created on the following basis: a. The star names were taken from the XZ80N (or from XZ94F for stars beyond X32221). b. The presentation of the name has been made more regular - with the use of upper/lower case for proper names and constellation names, lower case only for greek letters, full spellings, and commas to separate multiple names. c. Where there was more than one name for the same star, the names were put in the order: - Proper name (where multiple proper names existed for the same star, the first proper name listed in the "Yale Bright Star Catalog, 5th Revised Edition" was used); - Bayer greek letter; - Flamsteed number (but only if there is no Bayer greek letter); and - Variable identifier Note that in some instances the same proper name is allocated to more than one star. This is consistent with the name attribution in the Yale Bright Star Catalogue. d. Where a star has both a name and a variable identifier (other than an NSV number) the variable identifier is included after the name. NSV numbers are specified as such, as the name is independant of the constellation. e. Some stars include two constellation names. The constellation name corresponding to the pre-IAU defined constellation boundaries is given in brackets. [Note: the constellation in which the star is located is given without brackets. However the Flamsteed number is based on the constellation attribution prior to the 1930 IAU revision of constellation boundaries, and can only be properly specified by reference to that pre-revision constellation.] f. The names of variable stars listed in this field were compared with the file of variable stars. All variable names in XZVariables.dat were included. In addition, numerous deletions and some corrections were made. For details, see section 30 below. f. All Bayer Roman letter designations, B. (Bode), G. (Gould), H. and H1. (Hevelius) numbers have been deleted. [Those catalogues are not readily available, and the numbers are of little contemporary relevance.] The B., G., H., and H1. numbers that have been deleted are: XZ XZ XZ 43 80 B. Piscium 122 19 B. (Ceti) 150 24 B. (Ceti)/Psc 167 25 B. (Ceti)/Piscium 266 72 G. Piscium 277 93 B. Piscium 306 98 B. Piscium 309 42 B. (Ceti)/Piscium 320 44 B. (Ceti)/Piscium 451 54 B. (Ceti)/Piscium 501 87 G. Piscium 543 115 B. Piscium 569 64 B. Ceti 579 116 B. Piscium 664 91 G. Piscium 744 127 B. Piscium 847 136 B. Piscium 959 104 B. Ceti 1036 147 B. Piscium 1077 123 B. Ceti 1122 155 B. Piscium 1266 167 B. (Piscium)/Ceti 1284 169 B. Piscium 1320 171 B. Piscium 1405 180 B. Piscium 1512 192 B. Piscium 1559 198 B. Piscium 1631 210 B. Piscium 1654 212 B. Piscium 1745 222 B. Piscium 1877 235 B. Piscium 1910 242 B. Piscium 1915 241 B. Piscium 1917 243 B. Piscium 2001 254 B. Piscium 2021 117 G. Piscium 2049 263 B. Piscium 2134 268 B. Piscium 2169 269 B. Piscium 2224 122 G. Piscium 2241 278 B. Piscium 2264 281 B. Piscium 2336 288 B. Piscium 2496 300 B. (Piscium)/Arieti 2656 133 G. Piscium 2769 26 B. Arietis 2779 311 B. Piscium 2818 136 G. Piscium 2830 12 H1.Arietis 2845 34 B. Arietis 2856 35 B. Arietis 2879 39 B. (Arietis)/Pisciu 2936 47 B. Arietis 2963 20 H1.Arietis 3046 59 B. Arietis 3360 398 B. Ceti 3459 92 B. Arietis 3545 421 B. (Ceti)/Arietis 3612 434 B. (Ceti)/Arietis 3708 45 H1.Arietis 3714 114 B. Arietis 3827 124 B. Arietis 3937 134 B. Arietis 4037 145 B. Arietis 4068 147 B. Arietis 4123 151 B. Arietis 4170 3 B. (Tauri)/Arietis 4218 161 B. Arietis 4405 8 B. Tauri 4460 175 B. (Arietis)/Tauri 4594 26 B. Tauri 4670 30 B. Tauri 4687 14 H1.Tauri 4702 33 B. Tauri 4810 22 H1.Tauri 4938 104 B. Tauri 4940 105 B. Tauri 4982 133 B. Tauri 4992 14 H. Tauri 5022 142 B. Tauri 5054 148 B. Tauri 5090 150 B. Tauri 5220 162 B. Tauri 5227 163 B. Tauri 5229 161 B. Tauri 5236 164 B. Tauri 5303 173 B. Tauri 5370 179 B. Tauri 5373 180 B. Tauri 5422 188 B. Tauri 5458 193 B. Tauri 5466 192 B. Tauri 5497 194 B. Tauri 5609 85 H1.Tauri 5622 219 B. Tauri 5638 224 B. Tauri 5673 227 B. Tauri 5701 234 B. Tauri 5758 247 B. Tauri 5784 250 B. Tauri 5805 258 B. Tauri 5813 264 B. Tauri 5817 269 B. Tauri 5862 119 H1.Tauri 5865 275 B. Tauri 5906 282 B. Tauri 5917 284 B. Tauri 5946 129 H1.Tauri 6009 5 B. (Aurigae)/Tauri 6101 300 B. Tauri 6123 302 B. Tauri 6178 305 B. Tauri 6252 17 B. (Aurigae)/Tauri 6269 309 B. Tauri 6305 312 B. Tauri 6330 315 B. Tauri 6351 318 B. Tauri 6483 330 B. Tauri 6487 38 B. (Aurigae)/Tauri 6510 333 B. Tauri 6514 332 B. Tauri 6594 47 B. (Aur.)/Tauri 6760 61 B. Aurigae 6796 351 B. Tauri 6819 352 B. Tauri 6836 354 B. Tauri 6840 353 B. Tauri 6842 73 B. Aurigae 7077 167 H1.Tauri 7110 372 B. Tauri 7174 107 B. (Aurigae)/Tauri 7216 112 B. (Aurigae)/Tauri 7278 116 B. Aurigae 7387 175 H1.Tauri 7437 394 B. Tauri 7606 191 B. (Orionis)/Tauri 7612 399 B. Tauri 7710 406 B. Tauri 7747 408 B. Tauri 7799 203 B. Orionis 7908 154 B. Aurigae 7921 412 B. Tauri 8032 231 B. Orionis 8068 415 B. (Tauri)/Aurigae 8203 7 B. Geminorum 8280 183 B. Aurigae 8444 14 B. Geminorum 8596 19 B. (Geminorum)/Orio 8622 124 H1.Orionis 8747 26 B. Geminorum 8779 287 B. Orionis 8851 211 B. Aurigae 8867 292 B. (Orionis)/Gemini 8982 34 B. Geminorum 9013 36 B. Geminorum 9188 228 B. Aurigae 9439 52 B. Geminorum 9723 69 B. Geminorum 9812 74 B. Geminorum 9958 86 B. Geminorum 9962 87 B. Geminorum 10046 93 B. Geminorum 10104 98 B. Geminorum 10312 110 B. Geminorum 10316 41 H1.Geminorum 10337 109 B. Geminorum 10583 120 B. Geminorum 10758 55 H1.Geminorum 10798 134 B. Geminorum 10988 143 B. Geminorum 11090 149 B. Geminorum 11245 162 B. Geminorum 11417 171 B. Geminorum 11441 176 B. Geminorum 11473 181 B. Geminorum 11513 187 B. Geminorum 11584 192 B. Geminorum 11807 209 B. Geminorum 11862 212 B. Geminorum 11980 2 B. Cancri 12049 217 B. (Geminorum)/Canc 12056 5 B. Cancri 12172 10 H. Cancri 12360 30 B. Cancri 12431 35 B. Cancri 12540 23 H1.Cancri 12593 49 B. Cancri 12934 84 B. Cancri 13001 90 B. Cancri 13052 94 B. Cancri 13123 98 B. Cancri 13150 102 B. Cancri 13168 107 B. Cancri 13182 109 B. Cancri 13205 110 B. Cancri 13327 125 B. Cancri 13439 138 B. Cancri 13440 139 B. Cancri 13660 176 B. Cancri 13664 177 B. Cancri 13855 194 B. Cancri 13905 209 B. Cancri 13990 90 H1.Cancri 14088 222 B. Cancri 14168 227 B. Cancri 14257 9 B. Leonis 14280 12 B. Leonis 14355 15 B. Leonis 14496 35 B. Leonis 14582 43 B. Leonis 14624 47 B. Leonis 14678 53 B. Leonis 14705 57 B. Leonis 14739 10 B. (Sex)/Leo 14914 25 B. Sextantis 14925 79 B. Leonis 14975 83 B. Leonis 15020 89 B. Leonis 15160 104 B. Leonis 15199 107 B. Leonis 15414 128 B. Leonis 15458 137 B. Leonis 15547 149 B. Leonis 15574 155 B. (Leonis)/Sextant 15636 84 B. Sextantis 15654 162 B. Leonis 15696 167 B. Leonis 15743 173 B. Leonis 15897 78 H1.Leonis 16136 210 B. Leonis 16288 227 B. (Leonis)/Sextans 16293 228 B. Leonis 16332 237 B. Leonis 16522 262 B. Leonis 16633 283 B. Leonis 16711 291 B. Leonis 16738 295 B. Leonis 16803 300 B. Leonis 16890 308 B. Leonis 17012 123 H1.Leonis 17112 358 B. Leonis 17116 359 B. Leonis 17187 376 B. Leonis 17224 388 B. Leonis 17272 398 B. Leonis 17389 419 B. Leonis 17423 424 B. Leonis 17469 431 B. (Leonis)/Virgini 17514 438 B. (Leonis)/Virgini 17560 451 B. (Leonis)/Virgini 17698 9 B. Virginis 17701 10 B. Virginis 17739 13 B. Virginis 17783 16 B. Virginis 17825 20 B. Virginis 17853 24 B. Virginis 17875 18 G. Virginis 17878 26 B. Virginis 17892 27 B. Virginis 17933 31 B. Virginis 17989 36 B. Virginis 18011 41 B. Virginis 18028 44 B. Virginis 18041 46 B. Virginis 18082 52 B. Virginis 18133 64 B. Virginis 18152 65 B. Virginis 18156 39 B. Virginis 18199 76 B. Virginis 18205 78 B. Virginis 18274 98 B. Virginis 18276 42 G. Virginis 18372 127 B. Virginis 18376 129 B. Virginis 18469 162 B. Virginis 18470 163 B. Virginis 18515 190 B. Virginis 18519 193 B. Virginis 18539 200 B. Virginis 18583 218 B. Virginis 18620 237 B. Virginis 18638 250 B. Virginis 18642 71 G. Virginis 18658 261 B. Virginis 18742 298 B. Virginis 18786 319 B. Virginis 18825 339 B. Virginis 18854 343 B. Virginis 18893 91 G. Virginis 18902 370 B. Virginis 18917 385 B. Virginis 18928 96 G. Virginis 18944 99 G. Virginis 19127 439 B. Virginis 19226 474 B. Virginis 19265 487 B. Virginis 19320 496 B. Virginis 19322 497 B. Virginis 19328 499 B. Virginis 19410 519 B. Virginis 19433 534 B. Virginis 19503 550 B. Virginis 19552 559 B. Virginis 19588 562 B. Virginis 19651 176 G. Virginis 19662 566 B. Virginis 19682 568 B. Virginis 19686 571 B. Virginis 19717 575 B. Virginis 19723 186 G. Virginis 19816 598 B. Virginis 19832 600 B. Virginis 19833 601 B. Virginis 19869 608 B. Virginis 19873 607 B. Virginis 19895 614 B. Virginis 19956 623 B. Virginis 19958 621 B. Virginis 19971 214 G. Virginis 20004 672 B. Virginis 20030 633 B. Virginis 20064 40 H. Virginis 20125 43 H. Virginis 20143 229 G. Virginis 20148 652 B. Virginis 20149 231 G. Virginis 20162 654 B. Virginis 20171 235 G. Virginis 20178 236 G. Virginis 20238 668 B. Virginis 20261 2 G. Librae 20275 4 G. Librae 20281 6 G. Librae 20310 7 G. Librae 20322 8 G. Librae 20408 9 G. Librae 20447 6 B. Librae 20474 8 B. Librae 20529 11 B. Librae 20597 17 G. Librae 20613 18 G. Librae 20626 22 B. Librae 20689 28 G. Librae 20786 43 B. Librae 20799 47 B. Librae 20888 64 B. Librae 20939 47 G. Librae 20995 50 G. Librae 21036 88 B. Librae 21043 90 B. Librae 21090 97 B. Librae 21123 64 G. Librae 21244 130 B. Librae 21299 137 B. Librae 21369 147 B. Librae 21386 150 B. Librae 21407 11 H. Librae 21420 153 B. Librae 21513 169 B. Librae 21521 172 B. Librae 21527 100 G. Librae 21532 175 B. Librae 21536 174 B. Librae 21546 177 B. Librae 21586 182 B. Librae 21618 185 B. Librae 21622 190 B. Librae 21701 23 B. Scorpii 21725 194 B. Librae 21764 195 B. Librae 21794 31 B. Scorpii 21795 32 B. Scorpii 21846 202 B. Librae 21854 203 B. Librae 21867 204 B. Librae 21871 10 G. Scorpii 21889 40 B. Scorpii 21971 49 B. Scorpii 21975 48 B. Scorpii 21982 50 B. Scorpii 22018 56 B. Scorpii 22027 57 B. Scorpii 22063 24 G. Scorpii 22067 65 B. Scorpii 22084 27 G. Scorpii 22105 73 B. Scorpii 22106 71 B. Scorpii 22170 83 B. Scorpii 22171 41 G. Scorpii 22188 84 B. Scorpii 22194 88 B. Scorpii 22195 85 B. Scorpii 22212 91 B. Scorpii 22218 90 B. Scorpii 22227 51 G. Scorpii 22228 93 B. Scorpii 22255 98 B. Scorpii 22256 58 G. Scorpii 22307 107 B. Scorpii 22397 116 B. Scorpii 22479 120 B. (Scorpii)/Ophi. 22480 121 B. (Scorpii)/Ophi. 22507 123 B. (Scorpii)/Ophi. 22519 126 B. (Scorpii)/Ophi. 22523 131 B. (Scorpii)/Ophi. 22552 88 G. Scorpii 22562 134 B. Scorpii 22572 135 B. Scorpii 22689 63 B. Ophiuchi 22743 68 B. Ophiuchi 22768 70 B. Ophiuchi 22798 74 B. Ophiuchi 22811 78 B. Ophiuchi 22829 81 B. Ophiuchi 22903 90 B. Ophiuchi 22905 88 B. Ophiuchi 23014 165 B. (Scorpii)/Ophi. 23022 108 B. Ophiuchi 23031 109 B. Ophiuchi 23056 116 B. Ophiuchi 23066 118 B. Ophiuchi 23104 125 B. Ophiuchi 23152 132 B. Ophiuchi 23196 93 G. Ophiuchi 23197 137 B. Ophiuchi 23201 95 G. Ophiuchi 23252 142 B. Ophiuchi 23293 150 B. Ophiuchi 23329 157 B. Ophiuchi 23370 164 B. Ophiuchi 23388 166 B. Ophiuchi 23419 125 G. Ophiuchi 23488 192 B. Ophiuchi 23489 190 B. Ophiuchi 23497 191 B. Ophiuchi 23523 193 B. Ophiuchi 23537 136 G. Ophiuchi 23623 151 G. Ophiuchi 23647 226 B. Ophiuchi 23760 158 G. Ophiuchi 23769 2 B. (Sagittarii)/Oph 23855 163 G. Ophiuchi 24002 4 G. Sagittarii 24043 285 B. (Ophiuchi)/Sgr. 24055 5 G. Sagittarii 24092 6 G. Sagittarii 24116 290 B. (Ophiuchi)/Sgr. 24144 11 B. Sagittarii 24211 305 B. (Ophiuchi)/Sgr. 24224 11 G. Sagittarii 24233 10 G. Sagittarii 24298 210 B. (Scorpii)/Sgr. 24312 14 B. Sagittarii 24349 16 G. Sagittarii 24424 21 G. Sagittarii 24451 24 B. Sagittarii 24554 27 G. Sagittarii 24623 30 G. Sagittarii 24650 32 G. Sagittarii 24651 38 B. Sagittarii 24669 42 B. Sagittarii 24780 39 G. Sagittarii 24932 64 B. Sagittarii 24985 48 G. Sagittarii 24986 62 B. Sagittarii 24988 6 B. (Scuti)/Sagittar 24998 52 G. Sagittarii 25011 66 B. Sagittarii 25034 67 B. Sagittarii 25037 17 H1.Sagittarii 25116 55 G. Sagittarii 25130 70 B. Sagittarii 25140 58 G. Sagittarii 25154 72 B. Sagittarii 25316 68 G. Sagittarii 25317 66 G. Sagittarii 25322 69 G. Sagittarii 25324 85 B. Sagittarii 25329 84 B. Sagittarii 25348 86 B. Sagittarii 25383 95 B. Sagittarii 25418 100 B. Sagittarii 25535 108 B. Sagittarii 25539 110 B. Sagittarii 25549 80 G. Sagittarii 25577 82 G. Sagittarii 25608 115 B. Sagittarii 25610 116 B. Sagittarii 25620 117 B. Sagittarii 25627 121 B. Sagittarii 25650 87 G. Sagittarii 25732 89 G. Sagittarii 25775 92 G. Sagittarii 25788 126 B. Sagittarii 25807 128 B. Sagittarii 25828 130 B. Sagittarii 25880 133 B. Sagittarii 26010 140 B. Sagittarii 26098 155 B. Sagittarii 26112 154 B. Sagittarii 26174 162 B. Sagittarii 26235 127 G. Sagittarii 26267 168 B. Sagittarii 26288 172 B. Sagittarii 26305 171 B. Sagittarii 26308 173 B. Sagittarii 26334 176 B. Sagittarii 26415 187 B. Sagittarii 26423 183 B. Sagittarii 26443 189 B. Sagittarii 26449 190 B. Sagittarii 26457 191 B. Sagittarii 26458 145 G. Sagittarii 26498 195 B. Sagittarii 26571 199 B. Sagittarii 26594 201 B. Sagittarii 26654 208 B. Sagittarii 26772 217 B. Sagittarii 26811 222 B. Sagittarii 26813 221 B. Sagittarii 26840 224 B. Sagittarii 26841 226 B. Sagittarii 26924 234 B. Sagittarii 27035 246 B. Sagittarii 27077 248 B. Sagittarii 27117 253 B. Sagittarii 27217 260 B. Sagittarii 27240 203 G. Sagittarii 27263 266 B. Sagittarii 27279 267 B. Sagittarii 27364 274 B. Sagittarii 27423 281 B. Sagittarii 27455 283 B. Sagittarii 27560 292 B. Sagittarii 27704 308 B. Sagittarii 27732 247 G. Sagittarii 27820 322 B. Sagittarii 27859 329 B. Sagittarii 27898 337 B. Sagittarii 27903 336 B. Sagittarii 27936 341 B. Sagittarii 27940 340 B. Sagittarii 28001 347 B. (Sagittarii)/Cap 28007 1 B. Capricorni 28023 349 B. (Sagittarii)/Cap 28042 353 B. (Sagittarii)/Cap 28275 16 B. Cap 28342 21 B. Capricorni 28380 26 B. Capricorni 28448 374 B. (Sagittarii)/Cap 28472 30 B. Capricorni 28474 31 B. Capricorni 28477 29 B. Capricorni 28478 35 B. Capricorni 28480 34 B. Capricorni 28485 36 B. Capricorni 28531 27 G. Capricorni 28563 41 B. Capricorni 28566 40 B. Capricorni 28593 45 B. Capricorni 28633 47 B. Capricorni 28650 48 B. Capricorni 28677 35 G. Capricorni 28686 52 B. Capricorni 28737 56 B. Capricorni 28747 61 B. Capricorni 28914 73 B. Capricorni 28946 81 B. Capricorni 28964 84 B. Capricorni 29001 87 B. (Capricorni)/Aqu 29007 86 B. Capricorni 29013 16 B. Aquarii 29017 59 G. Capricorni 29028 88 B. Capricorni 29045 90 B. Capricorni 29101 94 B. Capricorni 29124 95 B. (Cap.) Aquarii 29195 35 B. Aquarii 29289 105 B. Capricorni 29298 107 B. Capricorni 29304 43 B. Aquarii 29312 74 G. Capricorni 29384 47 B. Aquarii 29441 113 B. Capricorni 29450 51 G. Aquarii 29465 114 B. Capricorni 29488 53 B. Aquarii 29550 120 B. Capricorni 29610 64 G. Aquarii 29704 96 G. Capricorni 29719 72 B. (Aquarii)/Capr. 29743 128 B. Capricorni 29756 73 B. (Aquarii)/Capr. 29782 75 B. (Aqr)/Cap. 29805 131 B. Capricorni 29902 136 B. Capricorni 29927 137 B. Capricorni 29993 143 B. Capricorni 30024 117 G. Capricorni 30106 151 B. Capricorni 30114 152 B. Capricorni 30134 154 B. Capricorni 30156 129 G. Capricorni 30163 96 B. (Aquarii)/Capr. 30187 156 B. Capricorni 30236 106 B. Aquarii 30305 161 B. (Capricorni)/Aqu 30359 122 B. Aquarii 30417 128 B. Aquarii 30441 134 B. Aquarii 30461 135 B. Aquarii 30471 138 B. Aquarii 30502 143 B. Aquarii 30542 150 B. Aquarii 30609 162 B. Aquarii 30635 170 B. Aquarii 30683 145 G. Aquarii 30742 182 B. Aquarii 30765 186 B. Aquarii 30766 187 B. Aquarii 30769 58 B. Aquarii 30795 192 B. Aquarii 30860 167 G. Aquarii 30881 204 B. Aquarii 30890 207 B. Aquarii 30907 209 B. Aquarii 30931 213 B. Aquarii 30993 231 B. Aquarii 31063 243 B. Aquarii 31097 252 B. Aquarii 31123 255 B. (Aqr.)/Psc 31125 197 G. Aquarii 31135 6 G. Piscium 31160 257 B. Aquarii 31172 260 B. Aquarii 31189 263 B. Aquarii 31270 272 B. Aquarii 31331 282 B. Aquarii 31396 290 B. Aquarii 31406 293 B. Aquarii 31442 303 B. Aquarii 31484 316 B. Aquarii 31496 317 B. Aquarii 31507 319 B. Aquarii 31540 22 B. Piscium 31616 336 B. Aquarii 31625 37 B. Aquarii 31656 342 B. Aquarii 31679 34 G. Piscium 31729 351 B. Aquarii 31739 352 B. Aquarii 31767 252 G. Aquarii 31939 376 B. Aquarii 32064 60 B. Piscium 32163 70 B. Piscium 32164 71 B. Piscium 32213 74 B. Piscium 32617 126 B. Piscium 32749 168 B. Piscium 32858 276 B. Piscium 33013 300 G. Ceti 33545 143 B. Tau 33604 1 B. (Aurigae)/Tauri 33679 58 B. Ori 34219 51 H1.Leonis 35218 249 B. Virginis 37796 658 B. Virginis 38450 15 G. Librae 39753 16 B. (Sco)/Librae 40511 64 B. Scorpii 41503 48 G. Ophiuchi 42165 161 B. Ophiuchi 45363 181 B. Sagittarii 46077 243 B. Sagittarii 51506 133 B. Aquarii 53099 13 B. Piscium The Bayer Roman letter designations that have been deleted are: 5300 A Tauri 13246 A1 Cancri 13342 A2 Cancri 15249 A Leonis 17687 A1 Virginis In the final catalogue, 2311 entries have a name identifier. Of the names given in XZ80P, 188 variable star designations, and 681 catalogue identifications (as immediately above) have been deleted - resulting in name entries for 744 stars being completely deleted. 18. Format of XZStarNames.dat XZStarNames is formatted using a variable-length record. The field definitions are: Column Format Meaning 01 - 07 nnnnnn_ XZ number 08 - X xxxxxxx Star name(s). The names are: * separated by commas * given in the order: - proper name - Bayer letter or Flamsteed number - Variable identifier X+1 - X+2 xx CR/LF sequence. ============================================================================ XZDoubles.dat AND XZDoubles Discoveries.dat ============================================================================ 19. Introduction The double star information for the XZ series of catalogues was held in a file called dsFile. That file, created in the 60's, held the information in a single-line entry which was limited to 3 components. In addition there were several associated files maintaining data. However in recent years it has been recognised that the dsFile data was in serious need of a complete revision - taking into account modern observational data, and better correlating the data with the XZ Catalogue. The files XZDoubles.dat and XZDoubles Discoveries.dat are the conclusion of that revision. 20. Construction of XZDoubles.dat The construction of the new file used WDS2001 as the basic catalogue on which to build the new XZDoubles.dat file. To make the catalogue complete, information was added from dsFile; a scan of XZ80Q was conducted to identify all close (<10") stars in the catalogue, which were added to the catalogue; and all ecliptic stars the in the USNO Sixth Catalog of Orbits of Visual Binary Stars (Hartkopf & Mason 2001) were added. Finally, the data in the Fourth Catalogue of Interferometric Measures of Double Stars was scanned to identify further double stars, and to provide confirmation designations for stars that had been identified in occultations as doubles. The methodology used was: a. Extract all ecliptic stars (Latitude less than 6d 40') from WDS2001, where the magnitude of the primary was <13.0; b. Match the primary stars with the XZ catalogue. Discard faint entries with no match in XZ80Q to make the basic XZDoubles file, unless they are part of a system that has an XZ entry. c. With the dsFile, identify entries that relate to discovery observations, and create a file (XZDoubles Discoveries.dat) that contains information about the discovery, and allocate a new identifier (OCCnnnn). [Details about this file are given in sections 25 to 27 below.] Using the information in the dsFile, create records in the format of WDS2001, and merge the dsFile data with the basic XZDoubles data, removing obviously duplicated records; d. For each entry, identify any matches in XZ80Q to the secondary component. Also, check the XZ number allocation to make sure that the separation and position angle corresponds to the double star information; e. Scan XZ80Q to identify every instance where there are two stars within 10" of each other. Create records in the format of WDS2001 using the XZ80Q data, and merge with the XZDoubles data - removing obviously duplicated records. f. Sort data by RA, declination, and component identifier. g. Manual edit of the file, to identify and remove duplicate records. h. Extract all ecliptic stars from the USNO Sixth Catalog of Orbits of Visual Binary Stars. Create records in XZDoubles for a small number of stars that had no entry. Add the orbital elements to the XZDoubles file. i. Scan the Fourth Catalogue of Interferometric Measures of Double Stars to extract data for pairs not found in the preceding process, and also to give confirmation identifiers to the stars listed in XZDoubles Discoveries.dat. 21. Format of XZDoubles.dat. The file is formatted using a fixed-length record of length 200. The fields are as used in WDS, and the USNO Sixth Catalog of Orbits of Visual Binary Stars, with extra space allocated to position angles (to give 1 decimal place where needed), and separations (to give 3 decimal places where needed). The field definitions are: Column Format Meaning 01 - 07 nnnnnn_ XZ number of the primary (if any) 08 - 14 nnnnnn_ XZ number of the secondary (if any) 15 - 21 nnnnnn_ XZ number of the principle star in the system 22 - 26 hhmmm Right Ascension (2000) in WDS format 27 - 31 +ddmm Declination (2000) in WDS format 32 - 39 _xxxxxxx Double star discoverer identifier 40 - 45 _xxxxx Double star component identifier 46 - 50 _yyyy Year of first observation 51 - 55 _yyyy Year of last observation 56 - 58 _nn Number of observations 59 - 64 _ppp.p Position angle at first observation 65 - 70 _ppp.p Position angle at last observation 71 - 78 _ddd.ddd Separation at first observation [But see Notes column, for '6'] 79 - 86 _ddd.ddd Separation at last observation 87 - 92 _mm.mm Magnitude of primary 93 - 98 _mm.mm Magnitude of secondary. If no magnitude is given for the primary, this magnitude will usually be a differential magnitude. 99 - 108 _xxxxxxxxxx Spectral type of primary 109 - 113 _+xxx Proper motion in RA (arc secs/1000yrs) 114 - 118 _+xxx Proper motion in Declination (arc secs/1000yrs) 119 - 127 _+xxyyyyy BD/CD/CPD number 128 - 131 _NNN Notes from WDS2001 D: Delta Magnitude given. N: Notes found in the Notes table. O: Orbit. Where motion has exceeded 360 degrees, no values are listed in the position angle and separation columns. Orbits may be found in the "Fourth Catalog of Orbits of Visual Binary Stars" (Worley and Heintz, 1983), and in the Information Circulars published by Commission 26 of the IAU, as well as in the literature. P: 100 year proper motion in right ascension. Q: 100 year proper motion in declination. R: 100 year proper motion in right ascension and declination. a: Pair appears in an appendix list, not part of the discoverer's regular numbering system. p: Coordinates and proper motions from the ACRS, PPM, IRS, and FK5 catalogs. r: Pair was listed, but in a "rejected" list, not part of the discoverer's regular numbering sequence. s: Pair has other discoverer's designations and num- bers in the literature due to duplicate discovery. We have given credit to the earliest discovery observation (and correct identification) reported in the literature. The List of Synonyms follows the List of Additional Discoverers. 6: Separation given in minutes of arc rather than seconds. XZ: Double identified from scan of XZ80Q for stars within 10" of each other. 132 - 142 _yyyy.yyyyy Orbital period, in years 143 - 152 _xx.xxxxxx Semi-major axis, in arc secs. 153 - 161 _xxx.xxxx Inclination (degrees) 162 - 170 _xxx.xxxx Node (degrees) 171 - 181 _yyyy.yyyyy Date of periastron 182 - 189 _0.xxxxx Eccentricity 190 - 198 _xxx.xxxx Periastron (degrees) 199 - 200 xx CR/LF The stars are sorted in the files in order of * Right ascension; then by * Decreasing declination; then by * Component identifier, with - A preceding B, and - lower case preceeding upper case (except where the lower case is used for a primary component.) Where a system includes several stars with identifiers, and one or more components without identifiers, the components without identifier may appear either before or after the other components. 22. Notes In the USNO Sixth Catalog of Orbits of Visual Binary Stars, and stars in the Fourth Catalogue of Interferometric Measures of Double Stars the naming convention for some stars was inconsistent with the WDS2001 naming convention. So that certain names would fit in the relevant field, the following changes were made: - Stars identified as SAO nnnnnn were renamed as Snnnnnn. There is potential ambiguity with the stars labelled S nnn. The four instances of SAO numbers are: SAO 76196, 92318, 93962, 119113. In all instances, only orbital elements are given for these stars. Similarly, stars in the interferometric catalogue identified as PPM nnnnnn were renamed Pnnnnnn - Stars with Bayer identification were brought within the field limit (if needed) by removing spaces in the name. Eg "the 2 Tau" => "the2Tau" - Five stars identified as GC nnnnn were reformatted to GCnnnnn. Two stars identified as LTT nnnn were reformatted to LTTnnnn. Many of the OCC stars must be presumed as being somewhat uncertain regarding whether the star is a double star, or whether the observer saw the effect of either stellar diameter, or Fresnel diffraction. Fresnel diffraction is a possible cause for bright stars; stellar diameter is a possible effect for stars of spectral type G, K, or M. However the fact that an OCC star falls into these categories does not mean the star is not double; many OCC stars falling into these categories have subsequently been confirmed as being double. A number of entries have no discoverer identifier, and no dates. These entries have come from dsFile, with dsFile not recording discovery details for those entries. For most systems involving more than two stars, a 'minimal' set of data is given. For example, for a system involving three stars, the entries will typically give the data for the components AB and AC, but will not give data for the pair BC. However, in a small number of instances such 'redundant' data is provided. These are limited to instances where the data was given in the WDS, and for about 10 triple systems added as a result of the scan of the XZ80Q catalogue for close stars. 23. Problem entries In the course of compiling the data, it was necessary to manually remove a significant number of duplicate records. While every effort has been made to remove such duplicates, it is almost inevitable that a small number of duplicate entries remain in the data. There is a small concern about the stars added to the XZ80Q catalogue from the Tycho2 catalogue. There are several instances where there are three stars listed as close together, in a straight line, and with similar magnitudes. In some of these instances there is a corresponding WDS entry for the star - as a double, not triple. It would seem possible that these triple entries are instrumental errors, and that one of the XZ entries is a false entry. These are discussed in section 16 above. The following problem entries are noted. bet Sco = XZ 22017, 16054-1948 The USNO Sixth Catalog of Orbits of Visual Binary Stars gives an orbit for the pair AB, and a separate orbit for 'bet Sco'. The semimajor axis for beta Sco is given as 1.4", while the period is given as about 7 days. Presumably this orbit is for a spectroscopic companion, and the semimajor axis is in error. XZ 3039 = 02130+0851, MCA 5 The semimajor axis is given as a negative value. It is an astrometric orbit from Hipparcos. XZ 10907 has two entries. STF1066 A is an astrometric orbit for the brighter component. XZ 25958 and XZ 25968 There is a remarkable similarity of the data for two nearby stars - but they are different systems. XZ 43245 is allocated to two systems XZ 84011 Is allocated to three separate WDS entries, with only one being correct. - POU1096, POU1098, and POU1099. The following is a list of all OCCnnnn stars where more than one close component is reported for an XZ star. In some instances the likelihood of there in fact being more than one close companion may not be great. OCC 20 OCC 20 [1923] OCC 160 OCC 160 [1932] OCC 231 OCC 231 [1966] OCC 255 OCC 255 [1972, 1995] OCC 259 OCC 259 [1972] OCC 331 OCC 331 [1974] OCC 396 OCC 396 [1975, 1993] OCC 418 OCC 418 [1975] OCC 424 OCC 424 [1976, 1988, 1990] OCC 500 OCC 500 [1977] OCC 536 OCC 536 [1977] OCC 894 OCC 957 [1996] [1966] OCC 996 OCC 996 [1997] A number of the OCCnnnn stars have incomplete information regarding the date of the discovery observations, typically missing the day, or month and day. Those OCC stars are: 205 223 230 231 254 255 294 295 296 297 298 299 300 302 336 341 353 373 374 396 406 425 436 437 442 472 473 481 514 690 One OCC star - OCC1014 = XZ 13809 - has an ambiguity in the date. Dates suggested in dsFile are 1998 May 26, 1989 May 26, or 1985 Sep 26. However the star was not occulted on any of these dates. While the star was occulted in 1998 and 1999, there were no occultations on the 26th of any month, and the two occultations in May 1998 (03 and 30) do not seem likely events. There were no occultations on May 25, 26 or 27, or Sep 25, 26 or 27, in 1971/2/3, 1979/80, 1990/1/2, and 1997/8/9. This suggests that the star has been incorrectly identified. Alternative discoveries are suggested for the following stars: OCC 396 (=XZ 9470) R SANDY on 1975 April 17 ON 1,8,73 OCC 341 (=XZ30890) H POVENMIRE on 1973 Oct 9 ON 1,2,14 The following OCC star has been identified from reported observations: OCC 788 = XZ117924. Reported ID of +08 2343 in error. Report of event found in file of RGO observations - 1990 May 30 21h 39m 10.9s, with a reported unidentified component. The following OCC star has not been definitively identified: OCC 597 = XZ6281? Reported id is +16 0633, which corresponds to XZ70402. However this star was not occulted at the location on the reported date. The star SAO94187 was occulted on the reported date, at a PA corresponding to the reported PA of the double, and has similar double star parameters. Several stars are listed in dsFile for suspect observations, giving a date. However no occultation occurred on the relevant date, suggesting that the discoveries were by traditional means. No OCCnnnn number has been allocated to these stars. The stars with code WI or MI are from Mt Wilson; FF is F Fekel. All these stars are included in XZDoubles. The stars are: XZ Code reference WDS ID Comment XZ 8178 FF ON 1 13 140 = MCA 24 (ON comment: Spectroscopic binary added for close pair) XZ 13894 WI ON 1 2 14 = WRH 16 1937 Apr. XZ 13918 WI ON 1 2 14 = WRH 17 1940 Jan. XZ 15234 WI ON 1 2 14 = WRH 18 1940 Jan. XZ 24651 MI ON 1 2 14 MI 1940 Jan. (ON comment: doubtful) XZ 25814 MI ON 1 2 14 MI 1940 Jan. (ON comment: some doubt) XZ 7710 is listed in ON I 2 5 to "Correct error; 12 mag component of ADS". This relates to a wide pair, BU 1054. But also listed here (and in dsFile) is a component: PA 270, Sep 0.01, mags 5.9 and 7.2. This pair, which apparently is in ADS, is not listed in WDS - suggesting that it has been deleted as being non-existant. No entry for this component is included in XZDoubles. 24. Accessing the data in XZDoubles The XZDoubles file is intended to be maintained as a live record of double stars that are included in the XZ catalogue. The relationship between the data in XZDoubles and the XZ80Q catalogue is potentially complex. For any specified XZ star, there may be: * a single entry, with the component not in the XZ catalogue * a single entry, with the component in the XZ catalogue - with the component being the only other component in the system, or the component itself having separate entries covering other components in the system * one of several entries in a system, some or all of which have separate entries, and some of which may not have a separate entry * may have a component which is not in the XZ catalogue, and that component itself having a companion which is also not in the XZ catalogue. To provide a simple data structure, the WDS approach of limiting each entry to a pair of stars is maintained. To facilitate searching, the data is maintained in right ascension order. To facilitate linking of the various components that make up a system, the first three columns in XZDoubles provide: * the XZ number of the primary star in the pair. A number is given for most entries. However there are a small number of entries where neither star in the pair is in the XZ80Q catalogue, but one of those stars is a companion to a star that is in the XZ80Q catalogue. * the XZ number of the companion star in the pair. This number is given for about 15% of the entries. * the XZ number of the principle star in a system. This number is given for all entries. To access the data for a specified XZ number, a possible approach would be: * derive the 2000 RA of the XZ star, put in the WDS format (hhmmm), reduce by 0.2m (to allow for a lack of correspondance between the 'official' WDS identifier for RA, and the value calculated using the precise coordinates of the star), and conduct a binary search on the RA field to obtain the first entry >= the reduced RA. * perform a linear search through the successive fields, extracting the data in the following manner: * to find all pairs directly involving the star, look for the XZ number in either the first or second column. (Note: there could be multiple instances, so the scan should not exit merely when a pair is found.) * to find information for every star in the system, first find an entry with the XZ number in the first or second column. Secondly, read the XZ number of the principal component from the third column. Then repeat the scan looking for all entries where the principle star is listed in the third column. Construct the system using the component identifiers to relate the pairs to each other. * the search can be concluded when the RA has exceeded the initial value by more than 0.2m (again to allow for differences in the coordinates). If the star has been found, the search can also be aborted when the XZ number in the third column changes from that given in the entry where a match is found. ============================================================================== XZDoubles Discoveries.dat ============================================================================== 25. Introduction As part of the overhaul of the DSFile information, data in that file system relating to stars discovered as double during a lunar occultation was extracted and combined into a single file. For ease of reference, and compatibility with the WDS2001 format, each discovery observation was allocated a unique reference number, using the format OCCnnnn. 26. Format of XZDoubles Discoveries.dat Column Format Meaning 01 - 07 OCCnnnn Identifier for occultation discoveries. The number was allocated in order of discovery date when this file was created - but this need not be continued for new discoveries. 08 - 13 XZ number of the star. 15 - 19 hhmmm Right Ascension (2000) - in WDS format 20 - 24 +ddmm Declination (2000) - in WDS format 26 - 33 yyyymmdd the date of the discovery observation 35 - 58 Discoverer's name 60 - 83 Reference for the discovery observation. [ON = Occultation Newsletter] 85 - 92 yyyymmdd the date of the first confirmation observation 94 -101 yyyymmdd the date of the second confirmation observation 103 -110 yyyymmdd the date of the third confirmation observation 112 -119 yyyymmdd the date of the fourth confirmation observation 121 -132 NNNnnnn cccc Double star identifier, and component identifier, in WDS. An entry here indicates that the star has been confirmed as double, usually by other techniques. 134 -141 +ddnnnnn BD/CD number 143 -149 iiyyMdd Discoverer identifier in the former dsFile. [Format = iiyyMdd, where ii= observer's initials, yy = year; M = Month (1-9, O,N,D); dd=day] 150 -151 CR/LF sequence 27. Construction of the file The initial construction of this file was based on dsFile data that was contained in several files in the dsFile system. The data was extracted in the following manner. a. All entries in dsFile.dat (30 Oct 2000 version) where the field identifying the Discoverer number or date [columns 91-97] indicated a discovery date (ie an occultation discovery) were extracted. b. The file dsFile.cfm (a file in the dsFile system) was scanned to obtain the dates of any confirmation observations for any stars identified in step 1. c. The data for the extracted stars were reformatted, had J2000 identifying coordinates added, sorted by discovery date, and allocated an OCCnnnn sequential number. d. The data was compared against the WDS. Where the WDS included the component pair, the WDS identifier was added. Where the dsFile data included a ternary component, one of the components in dsFile typically corresponded to a previously known wide component. In these cases, an identification was included only if it related to the close components. A significant number of entries in dsFile.cfm related to stars that were not included in dsFile.dat with discovery details, and relate to stars in XZDoubles that have identifiers from WDS2001. ======================================================================== XZVariables Catalogue ======================================================================== 28. Variable star data Historically the XZ catalogue has not maintained detailed information about any variable stars contained in the catalogue. This situation has been rectified with the creation of a file - XZVariables.dat - containing detailed variable star information for any variables occuring in the XZ80Q catalogue. The file of variable stars was generated by matching stars in XZ80Q with the coordinates given in the General Catalogue of Variable Stars (4th Edn) as provided in machine readable form from the Sternberg State Astronomical Institute. [http://www.sai.msu.su/groups/cluster/gcvs/gcvs]. The file versions were those available at the end of May 2002. The files used were: vol1.dat - Volume 1 of the GCVS [Constellations up to and including Crucis, with all coordinates revised to J2000] iii.dat - The consolidated GCVS as at end of 2001, with a mixture of B1950 and J2000 coordinates. Used for constellations after Crucis NSV.dat - New catalogue of Suspected Variable stars. B1950 coords. Stars indicated as "variability doubtful or erroneous to the compilers" were not extracted NSVS.dat - New catalogue of Suspected Variable stars - Supplement. Both B1950 and J2000 coordinates for virtually all stars. The methodology used was: - create an ecliptic subset (using a 7d latitude limit), with all cordinates referred to J2000, sorted by right ascension. In this process, the data extracted from each catalogue was put into a uniform format. - match the stars against XZ80Q, using a match distance corresponding to the coordinate accuracy flag in the GCVS. The match distance criterion used were: GCVS flag Distance none 7" : 20" * or ' 70" [The average match distance was 1.8". The average magnitude difference was 0.0, with a standard deviation of 0.9.] - manually check the list of matches to (i) resolve any instances of duplicate matches; (ii) check all instances where the magnitude at maximum was significantly different from the XZ80Q magnitude; and (iii) check all instances where the match distance was more than a few arc secs. - Check with previous versions to identify any anomalous stars that have been missed for some reason [esp from not allowing for high proper motions when converting GCSV 1950 positions to 2000 - adversely affecting the coordinates when matching: 8 stars identified in this step, including alpha Tau] - create the file of variable stars from the edited list. The ecliptic subset contained 11,758 stars. Of these 1,896 were nominally matched to one or more XZ80Q stars. After removing erroneous and duplicate matches, 1825 GCVS stars were matched with XZ80Q stars. Of these, 854 (or about 45%) are from the New Suspected Variable catalogues. When doing the manual check: - where the GCVS star was fainter than mag 12 at max, generally a high corelation in coordinates was required to record a matched. Also, for the stars to be matched with a maximum magnitude fainter than 13.0, the XZ80Q catalogue needed to indicate that the star was quite red; - for GCVS stars (other than novae) where the maximum mag was brighter than about 9, the required correlation in coordinates was reduced; and - for a number of stars it was apparent that the variable was the component of a double star, with the variable component not having a separate entry in XZ80Q. Such instances were treated as a non-match. - the following variable stars were added following a comparison of the variable names given in XZ80P with the variables identified by the above process: 20056 Z Vir 35805 RV Vir 37342 AK Vir 40720 V894 Sco 41171 KV Sco 41313 TV Oph 41524 GU Sco 42032 V1541 Oph 42057 V1625 Oph 42108 V517 Oph 43924 V355 Sag 44789 V1216 Sag 45115 BU Sag 45808 AL Sag 47084 V524 Sag The data extracted from the GCVS has exactly the same meaning as in the GCVS. It is held in order of XZ number - for retrieval using a binary search on the XZ number. In the XZ80Q file, all stars listed in this file are indicated in column 19 with the following code: E = eclipsing-type variable, magnitude variation >0.5 mag e = eclipsing-type variable, magnitude variation <0.5 mag V = other variable, magnitude variation >0.5 mag v = other variable, magnitude variation <0.5 mag S = suspected variable, magnitude variation >0.5 mag s = suspected variable, magnitude variation <0.5 mag 29. Format of XZVariables.dat The data is stored in a file with a fixed record length file of 94 characters. The content of each record is as follows: Columns Format Meaning 1 - 7 xxxxxx_ XZ Catalogue number ******************************** 8 -13 xx____ or | Variable name - as taken from the GCVS. Usually Vnnnn_ | either two letters, or a V number. For some | stars the Bayer Greek letter is given - truncated | in the GCVS to 3characters [spelling is sometimes | unusual] 14 -17 CCC_ | Constellation Abbreviation ******* OR ********************* 8 -17 NSV_nnnnn_ } NSV number. NSV numbers are in the range 1 to 14811. } The numbers from the NSV Supplement catalogue start } at 15000, with the last number at the time of } creating this file being 26206. ******************************** 18 -28 xxxxxxxxxx_ Variable type - taken directly from the GCVS. see below for a list of the codes. 29 -34 mm.mm_ Maximum magnitude 35 -40 Smm.mm_ Minimum magnitude, or magnitude range S: ( = value is the amplitude of variability < = brighter limit of minimum 41 -43 _xx Photometric system of the magnitudes [U_, B_, V_, R_, I_, K_. Hp= Hipparcos] 44 -57 24nnnnn.nnnnnn Julian date of maximum (or minimum for certain variable types) 58 -71 nnnn.nnnnnnnnn Period (days) 72 -75 _nnn Eclipse duration (for eclipsing stars); or Rise-time for other stars. Units are fraction of the period. That is: _10_ = 10%; _45_ = 45%; _075 = 7.5% 76 -92 xxx........ Spectral type 93 -94 CR/LF sequence The following [taken from the 'ReadMe' file of the NSV Supplement] is an abbreviated explanation of the variable star Type codes. ACV, ACVO Alpha2 Canum Venaticorum ACYG Alpha Cygni BCEP, BCEPS Beta Cephei BE Be BL BL Lacertae BY BY Draconis CEP Cepheid CST constant CW W Virginis DCEP Delta Cephei DSCT, DSCTC Delta Scuti E eclipsing EA Algol (Beta Persei) EB Beta Lyrae EW W Ursae Majoris ELL ellipsoidal FKCOM FK Comae Berenices FU FU Orionis GAL galaxy GCAS Gamma Cassiopejae I irregular IA, INA white irregular IB, INB red irregular IN irregular in a nebula IT, INT irregular of the T Tauri type IS, ISA rapid irregular L slow LB slow red LBV long-period pulsating B star M Mira (Omicron Ceti) type N Nova NL nova-like NR recurrent Nova QSO quasistellar object RR RR Lyrae RS RS Canum Venaticorum RV RV Tauri S rapid SN supernova SR, SRA, SRB, SRD semiregular SXARI SX Arietis SXPHE SX Phoenicis UG U Geminorum UGSS SS Cygni UV UV Ceti VAR variable WR Wolf-Rayet star XM X-ray system with a strong magnetic field XNA X-ray nova-like ZAND Z Camelopardalis ZZA, ZZO ZZ Ceti 30. Corrections to XZ variable star names XZ80P carried over the star names from XZ94F, and included variable star names. The names of all variables in XZVariables were added. In addition, the following revisions and deletions have been made. a. The following variable star identifications have been corrected. XZ Incorrect ID 33116 = V1084 Tau (V631 Tau) 33123 = NSV 15752 (V512 Tau) 33170 = NSV 01268 (V787 Tau) 33182 = V1041 Tau (OT Tau) 33232 = NSV 15769 (V527 Tau) 33364 = NSV 15783 (V458 Tau) 33390 = NSV 15785 (V757 Tau) 42920 = NSV 23937 (V3964 Sgr) 30309 = DX Aqr (30310 <> DX Aqr) b. The following variable star identifications have been deleted. [It may be noted that for the majority of these stars the maximum magnitude was considerably less than the catalogue magnitude (even allowing for different photometric systems) and the positional correlation was poor - especially in right ascension.] 33112 V629 Tauri 33115 NT Tauri 33120 MW Tauri 33128 MX Tauri 33134 NY Tauri 33139 V634 Tauri 33142 V442 Tauri 33148 V441 Tauri 33152 V744 Tauri 33156 V519 Tauri 33158 V521 Tauri 33174 V516 Tauri 33191 V523 Tauri 33193 V790 Tauri 33217 PQ Tauri 33246 PX Tauri 33250 V530 Tauri 33259 V449 Tauri 33264 PT Tauri 33266 V535 Tauri 33269 V713 Tauri 33280 FL Tauri 33297 V752 Tauri 33307 QV Tauri 33309 V654 Tauri 33316 QT Tauri 33337 V793 Tauri 33340 V541 Tauri 33346 V338 Tauri 33349 V794 Tauri 33351 V653 Tauri 33359 V542 Tauri 33363 V754 Tauri 33385 V349 Tauri 33389 V795 Tauri 33404 V759 Tauri 33416 V463 Tauri 33421 V758 Tauri 33432 V796 Tauri 33433 V551 Tauri 33436 V797 Tauri 33445 V467 Tauri 33467 V468 Tauri 33479 V667 Tauri 33484 V668 Tauri 33497 V361 Tauri 33501 II Tauri 33511 V369 Tauri 33514 V669 Tauri 33522 V469 Tauri 33533 V373 Tauri 33536 V555 Tauri 35392 BV Virginis 38379 SX Librae 39806 VV Librae 39834 CQ Librae 39980 DI Librae 39991 DK Librae 40128 DS Librae 40183 EO Librae 40210 FG Librae 40396 TY Scorpii 40480 V865 Scorpii 40615 TW Scorpii 40723 UY Scorpii 40783 GO Scorpii 41024 BO Scorpii 41551 EE Scorpii 41620 CL Ophiuchi 41680 V1124 Ophiuchi 41736 DT Ophiuchi 41752 BO Ophiuchi 41782 V1201 Ophiuchi 41813 QU Ophiuchi 41819 V1246 Ophiuchi 41820 V1264 Ophiuchi 41828 V1279 Ophiuchi 41863 V1298 Ophiuchi 41865 V1309 Ophiuchi 41876 V1314 Ophiuchi 41898 V1337 Ophiuchi 41917 V1358 Ophiuchi 41925 V352 Ophiuchi 41928 V1379 Ophiuchi 41939 V1405 Ophiuchi 41958 V1426 Ophiuchi 41959 V1431 Ophiuchi 41960 V1424 Ophiuchi 41989 V2101 Ophiuchi 42002 KL Ophiuchi 42005 V1497 Ophiuchi 42008 V1512 Ophiuchi 42009 V1523 Ophiuchi 42040 V1566 Ophiuchi 42060 V1614 Ophiuchi 42077 V1654 Ophiuchi 42090 V1680 Ophiuchi 42101 V1690 Ophiuchi 42109 V1719 Ophiuchi 42176 V1829 Ophiuchi 42179 V1843 Ophiuchi 42187 V1849 Ophiuchi 42188 V1855 Ophiuchi 42194 V1869 Ophiuchi 42214 V1886 Ophiuchi 42226 V1898 Ophiuchi 42256 V1948 Ophiuchi 42257 V1941 Ophiuchi 42297 V2001 Ophiuchi 42301 V2013 Ophiuchi 42336 BB Ophiuchi 42520 V537 Ophiuchi 42693 V546 Ophiuchi 42713 V549 Ophiuchi 42795 V556 Ophiuchi 43054 V780 Sagittarii 43095 VV Sagittarii 43134 V2421 Sagittarii 43170 V2461 Sagittarii 43222 V1317 Sagittarii 43225 V1323 Sagittarii 43229 V1324 Sagittarii 43231 V1328 Sagittarii 43244 V1380 Sagittarii 43266 V1435 Sagittarii 43286 V1478 Sagittarii 43290 V1513 Sagittarii 43294 V1772 Sagittarii 43295 V1773 Sagittarii 43303 V1789 Sagittarii 43305 V1769 Sagittarii 43307 V1787 Sagittarii 43322 V1548 Sagittarii 43582 V2303 Sagittarii 43672 V3921 Sagittarii 43715 V1591 Sagittarii 43739 V1592 Sagittarii 43771 V3800 Sagittarii 43964 GY Sagittarii 43969 V2546 Sagittarii 43980 V1299 Sagittarii 43994 V930 Sagittarii 44050 HS Sagittarii 44083 V3832 Sagittarii 44086 V2352 Sagittarii 44106 V1618 Sagittarii 44134 V2573 Sagittarii 44138 V4054 Sagittarii 44230 V1692 Sagittarii 44241 V1914 Sagittarii 44245 V2006 Sagittarii 44263 V913 Sagittarii 44264 V2009 Sagittarii 44270 V1629 Sagittarii 44311 IZ Sagittarii 44395 V3718 Sagittarii 44526 V1929 Sagittarii 44533 V2609 Sagittarii 44563 V2032 Sagittarii 44585 MV Sagittarii 44622 MY Sagittarii 44801 V808 Sagittarii 44883 V1023 Sagittarii 44902 V2057 Sagittarii 45000 V1031 Sagittarii 45110 V831 Sagittarii 45117 V1044 Sagittarii 45198 V2090 Sagittarii 45213 V2093 Sagittarii 45289 V2100 Sagittarii 45303 QY Sagittarii 45505 V1098 Sagittarii 45640 V1258 Sagittarii 45641 V2409 Sagittarii 45698 V878 Sagittarii 45732 V1259 Sagittarii 45753 V1122 Sagittarii 45822 V2136 Sagittarii 45851 V1265 Sagittarii 45962 V2143 Sagittarii 45969 V438 Sagittarii 49164 BX Aquarii 49803 VY Capricorni 49889 CR Aquarii 51529 AN Aquarii 54055 V752 Sagittarii ======================================================================== XZ Cross-reference lists ======================================================================== 31. Cross-reference lists While occultations have usually been predicted on the basis of Robertson's Zodiacal Catalogue and the USNO XZ catalogue (in its various versions), a number of other 'special purpose' catalogues were used during the 1980's and 1990's - mainly lunar eclipse fields, and for rich areas of the ecliptic. Apart from the P catalogue, the purpose of these catalogues was generally to facilitate the making of observations, rather than providing the precise positions needed for the reduction of those observations. Thus for many stars no proper motions were given, and the epoch could be quite old (especially when the position was taken from the Astrographic Catalogue.) To facilitate analysis of any observations reported using these special catalogue identifiers, cross-reference lists have been generated for each of these catalogues, giving the XZ number in XZ80Q for each star in the respective catalogue. Those catalogues, and the file names for the cross-reference lists, are: Catalogue XRef File #Entries #Cross-referenced B+M B_XZ.dat 555 455 C C_XZ.dat 15726 13929 E E_XZ.dat 1538 971 J J_XZ.dat 6421 5525 [Full version had 9030 records] K K_XZ.dat 948 948 [The K catalogue had a total of 7764 records, but the majority of records are null entries.] L L_XZ.dat 24936 22778 P P_XZ.cat 506 505 (the Pleiades) Q Q_XZ.dat 7179 2450 The cross-reference files use a fixed record length of 19 characters, with the following format: Columns Format Meaning 1 A1 Catalogue identifier [BCJKLPQ] 2 - 6 A5 number in the catalogue 7 - 11 A5 " = XZ" 12 - 17 A6 XZ number 18 - 19 A2 CR/LF sequence Thus the cross reference of L5905 to XZ106107 is formatted as: L 5905 = XZ106107 * For the B+M catalogue, the catalogue identifier is "B" * For the K catalogue, only non-null entries in the K catalogue are given. For all other catalogues, an entry is given for each record in the catalogue. * Where a star is not identified in XZ80Q, only the catalogue number is given. The remainder of the record is blank. To make the cross-reference lists, the stars were matched using the following criterion. * magnitude difference <2 (except for P, <1) * separation <10" * closest star that meets the previous two criteria. No attempt has been made to remove duplicate identifications - that is identification of an XZ star with more than one star in the catalogue. In some instances, the duplication arises from what are ultimately duplicate entries in the catalogue. For others, the catalogue properly has two entries with only one star properly in XZ80Q, with the match criteria insufficient to distinguish. David Herald August 2003 ****** ======================================================================== ======================================================================== ******************************************************************* * Following is that part of the documentation for XZ80P that sets * * out the changes and corrections made when XZ80P was created. * ******************************************************************* ======================================================================== ======================================================================== XZ80P documentation 1. Introduction The XZ94 series were created based mainly on the positional data in PPM, and the HIP data were incorporated into XZ94F, but they contained many misidentifications, which caused some complicated problems in reducing the past occultation observations and in predicting the future occultations. Since most of the stars of the past occultation observations (through 1993) were identified with XZ80N, we had to go back to it for the creation of a new version of XZ. The present XZ80P catalog was created by replacing the positional data in XZ80N with HIP, ACT, and PPM data where available. The identifications with ZC, SAO, BD, SD, CD, and AGK3 were checked with the original catalogs, and the errors of them were corrected. XZ80N contained 32221 stars. Since the occultations of stars of the XZ numbers beyond 32221 were also predicted for 1999 by IOTA, they were added in XZ80P from XZ94F without checking errors of the identifications or consistency with the stars up to the XZ numbers of 32221 (for example double star code D means "primary of double; secondary has separate XZ entry", but if the secondary's XZ number is beyond 32221, the code D is not given for the primary). The explanations in this documentation apply to the stars of the XZ numbers up to 32221, unless otherwise noted. The numbers of stars by source catalogs are given in the following table. Source No.<= No.> Catalog 32221 32221 Total ---------------------------------- HIP 10905 905 11810 ACT 19456 0 19456 PPM 1817 20171 21988 ACRS1 0 60 60 ZZ87 6 7 13 Others 23 569 592 Deleted 14 0 14 ---------------------------------- Total 32221 21712 53933 4. HIP numbers and TYC IDs For HIP stars, the HIP numbers are given at bytes 117-123 beginning with "H". The CCDM identifiers from HIP are given at bytes 130-139. If the star was identified with one of the components of double or multiple stars given in the HIP double/multiple systems annex, the sequential number (1-4) of the same HIP number in the annex is given at byte 125. The component can also be identified with the CCDM component identifier, which is given at byte 140. For example X 243 is the first component of HIP 1189, and its CCDM component identifier is 00148-0018 A. If the star's data were obtained by combining those of two components of the HIP star, the byte for the sequential number is filled with number 5 (for 1+2), 6 (for 1+3), or 8 (for 2+3), and both of the CCDM component identifiers are given at bytes 140-141. For example the data for X 4 were obtained by combining the data for the first and second components of HIP 223, and their CCDM identifiers are 00028+0208 A and B. For ACT stars, the TYC IDs are given at bytes 117-129 beginning with "T", but zeros are embedded for blanks as in ACT. For example X 4489's TYC ID is " 656 1180 1", but it is given as " 65600118001". 5. DM numbers There were 48 stars whose supplemental designations a and b were missing in XZ80N (47 a's and 1 b) because there was no space for them. A list of those stars is given below. These were all corrected in XZ80P. XZ No. Correct BD XZ No. Correct BD XZ No. Correct BD 443 BD+06 32a 6344 BD+26 765a 13811 BD+18 2117b 483 BD+03 40a 8618 BD+17 1181a 14950 BD+17 2153a 611 BD+02 62a 9220 BD+21 1270a 15110 BD+17 2163a 701 BD-01 66a 9731 BD+17 1377a 15457 BD+04 2308a 1460 BD+04 171a 10296 BD+29 1438a 15620 BD+07 2300a 1833 BD+02 191a 10521 BD+22 1590a 15763 BD+15 2214a 2838 BD+15 298a 11026 BD+22 1665a 16069 BD+01 2473a 3015 BD+08 339a 11390 BD+17 1620a 16111 BD+04 2379a 3109 BD+19 339a 11889 BD+22 1807a 16435 BD+08 2435a 3313 BD+12 336a 11892 BD+22 1808a 16494 BD+06 2374a 3554 BD+09 345a 12803 BD+21 1842a 16638 BD+03 2452a 3824 BD+18 368a 12811 BD+16 1732a 16706 BD+01 2520a 4418 BD+13 544a 12940 BD+16 1758a 16981 BD+06 2428a 5678 BD+21 638a 13018 BD+18 1990a 17061 BD+00 2770a 5919 BD+18 658a 13666 BD+19 2135a 17192 BD+04 2464a 6276 BD+16 663a 13804 BD+18 2117a 18201 BD-00 2550a Note that BD+21 1842a is a supplemental star added to BD by Becker (1951), but we could not find a corresponding star at the place indicated (RA 8h19m56.2s, Dec +21d00.7', Eq 1855). We assumed that the declination was in error, the correct one being +22d00.7', as AGK3 and PPM did, and identified it with X12803. The DM identifiers BD (Bonner Durchmusterung, +89d - -01d), SD (Southern Durchmusterung, -01d - -23d), CD (Cordoba Durchmusterung, -22d - -89d), and CP (Cape Photographic Durchmusterung, -18d - -89d) were not given in the original XZ80 catalogs. They were added in the XZ80N catalog distributed from the Astronomical Data Center of NASA Goddard Space Flight Center, but the identifiers for the zone -00 deg were all in error: "SD-00" should have been "BD-00". There were 412 stars which had such errors. I tried to retain the DM numbers in XZ80N unless they were obviously erroneous, but when more than one XZ stars had the same DM number, they were distinguished by suffixes added to the DM numbers. The suffixes p, s, and t were added in the order of magnitudes (p is the brightest; if the magnitudes were the same, the order was determined from the distances of the stars' positions from the position given in DM). So if one wants one-to-one correspondences between XZ and DM, I would recommend that the stars having the suffix p should be selected. There are 772 XZ80P stars which have the suffix p, s, or t (348 p's, 348 q's, and 4 t's for BD; 22 p's and 22 q's for SD; 14 p's and 14 q's for CD). For example, the DM numbers of both X 11 (9.4 mag.) and X 14 (10.0 mag.) were given as BD+06 5237, so the DM number of X 11 was given as BD+06 5237p and X 14 as BD+06 5237s. Note that the suffixes were added based on the magnitudes and positions given in XZ80N, so they may be inconsistent with the new magnitudes and positions in XZ80P. The following is noted: X 8425 may be BD+24 1125, but BD+24 1126 given in XZ80N is retained so that X 8425 = BD+24 1126s and X 8426 = BD+24 1126p. BD+24 1125 was not given in XZ80N. X10220 may be BD+17 1466a, but BD+17 1465 given in XZ80N is retained so that X10214 = BD+17 1465p and X10220 = BD+17 1465s. BD+17 1466a was not given in XZ80N. X10924 may be BD+24 1623, but BD+24 1625 given in XZ80N is retained. BD+24 1623 was not given in XZ80N. X12541 may be BD+17 1816, but BD+17 1815 given in XZ80N is retained. BD+17 1816 was not given in XZ80N. X17897 may be BD+00 2871, but BD+00 2870 given in XZ80N is retained. BD+00 2871 was not given in XZ80N. X23745 may be CD-2913809, but CD-2913812 given in XZ80N is retained. CD-2913809 was not given in XZ80N. X26068 may be CD-2213406, but CD-2213408 given in XZ80N is retained. CD-2213406 was not given in XZ80N. X26135 may be CD-2613616, but CD-2613617 given in XZ80N is retained. CD-2613616 was not given in XZ80N. The following table gives the DM number errors in XZ80N, which were corrected in XZ80P. XZ No. BD in XZ80N Correct BD Notes 190 BD-00 15 BD-00 14 (X 191 = BD-00 15) 251 BD-01 1218 BD-01 17 625 SD-01 9 719 BD+01 94 BD+01 95 1555 SD-02 163 2316 BD+07 256 BD+07 255 (X 2319 = BD+07 256) 2862 BD+12 275 BD+12 276s (X 2860 = BD+12 275) 2981 BD+15 309 BD+15 308 (X 2980 = BD+15 309) 3255 BD+17 360a 3289 BD+07 382 BD+07 383 (X 3290 = BD+07 382) 3316 BD+08 377 3543 BD+08 407 BD+08 406 (X 3544 = BD+08 407) 5315 BD+19 655 BD+19 656 (X 5314 = BD+19 655) 5398 BD+22 639 BD+22 640 7880 BD+20 1171a 8642 BD+16 1055 BD+16 1054 (X 8644 = BD+16 1055) 9263 BD+18 1250 BD+18 1251 10665 BD+27 1335 11130 BD+21 1604 BD+20 1811 (X11127 = BD+21 1604) 11253 BD+26 1581 12331 BD+19 1939 15197 BD+11 2163s 15540 BD+06 2297 15727 BD+07 2310 15765 BD+15 2215p 15795 BD+08 2377 16649 BD-00 2402a 16697 BD-01 2482 BD-01 2484 (X16696 = BD-01 2482) 17281 BD-01 2533 17419 BD+09 2517s 17629 BD+04 2522 BD+04 2524 18568 BD+01 2717 BD+01 2718 (X18565 = BD+01 2717) 19152 SD-07 3553 SD-07 3555 (X19142 = SD-07 3553) 19992 SD-16 3797 SD-16 3798 21762 SD-14 5290 SD-14 4290 23755 CD-2711769 CD-2711768 24104 CD-27 5823 CP-27 5823 (This is CD-2712041; this is the only star that was given the CP number in XZ80P among the stars of numbers up to X32221) 24231 CD-2712131 CD-2712135 24310 CD-2313709 CD-2413709 24639 CD-2313936 CD-2313937 24733 CD-2314011 CD-2314012 24767 CD-2612900 CD-2612898 25406 CD-2915039 CD-3015786 25477 CD-2213074 CD-2213075 26979 SD-20 5546 SD-20 5545 27251 CD-2614336 CD-2614337 27843 CD-23 409 SD-23 409 (This is CD-2214412) 28689 CD-2214865 CD-2214866 28740 CD-2214899 CD-2214900 29375 CD-23 436 SD-23 436 (This is CD-2215233) 30683 SD-17 6520 SD-17 6521 (The identification is due to DSC=E) 30684 SD-17 6521 SD-17 6520 (See the note for X30683) 31264 BD-01 7914 BD-01 4390p 31613 SD-07 6025 SD-07 6024 (X31614 = SD-07 6025; Magnitudes were opposite in XZ80N) 31925 SD-01 686 If a star was able to be found in more than one DM, the number given in XZ80N had higher priority. For example SD-02 5827 is given for the DM number for X31008, although it is also given in BD as BD-01 4349. The cross-identification between XZ and DM (BD, SD, and CD) was made using the machine-readable versions of DM distributed by the Astronomical Data Center of NASA Goddard Space Flight Center, but if the obtained identifications were inconsistent with those given in XZ80N, they were checked manually with the original DM, and errors in the machine-readable DM were found. Those errors are given in the following table. The declination error of BD+21 1842a in the original edition, which was explained above, is also included here. DM Number Col For Read DM Number Col For Read BD+23 1352 Dec +2340.6 +2346.6 CD-2312413 Mag 9.0 10. BD+22 456 RA 3 630.9 3 530.9 CD-2312413 RA 152936.0 152936.6 BD+22 457 RA 3 651.8 3 551.8 CD-2312413 Dec -2353.5 -2318.8 BD+22 458 RA 3 656.3 3 556.3 CD-2312414 Mag 10.0 9.0 BD+22 459 RA 3 658.7 3 558.7 CD-2312414 RA 152936.6 152936.0 BD+22 1808a Mag 10. 10.0 CD-2312414 Dec -2318.8 -2353.5 BD+21 396 Dec +2136.0 +2126.0 CD-2413475 Dec -2450.1 -2430.1 BD+21 949 Dec +21 5.2 +2152.9 CD-2413578 Mag 8.7 9.9 BD+21 1336 Dec +2150.6 +2130.6 CD-2413578 RA 174520.2 174520.3 BD+21 1842a Dec +2100.7 +2200.7 CD-2413578 Dec -2438.4 -2451.4 BD+20 1605 Dec +2015.3 +2045.3 CD-2413579 Mag 9.9 8.7 BD+20 2109 Dec +2035.6 +2055.6 CD-2413579 RA 174520.3 174520.2 BD+13 2074 RA 91223.8 91323.8 CD-2413579 Dec -2451.4 -2438.4 BD+13 2075 RA 91230.2 91330.2 CD-2414202 Mag 10.0 9.3 BD+13 2076 RA 91240.1 91340.1 CD-2414202 RA 181313.0 181313.5 BD+13 2077 RA 91254.6 91354.6 CD-2414202 Dec -2446.9 -24 0.1 SD-07 3694 Dec -0738.0 -07 3.8 CD-2414203 Mag 9.3 10. SD-09 5829 Dec -0948.0 -0944.8 CD-2414203 RA 181313.5 181313.0 SD-10 3892 Dec -10 2.2 -1019.5 CD-2414203 Dec -24 0.1 -2446.9 SD-10 3893 Dec -1019.5 -10 2.2 CD-2612149 Dec -2639.9 -2629.9 CD-2710862 Dec -2724.7 -2734.7 CD-2712844 Dec -2752.0 -2752.9 CD-2713714 Mag 8.5 9.3 CD-2713714 RA 19 642.5 19 642.9 CD-2713714 Dec -2735.6 -2724.7 CD-2713715 Mag 9.3 8.5 CD-2713715 RA 19 642.9 19 642.5 CD-2713715 Dec -2724.7 -2735.6 CD-2714302 Dec -2736.3 -2726.3 CD-2814598 Dec -2819.6 -2849.6 6. SAO numbers All the SAO numbers given in XZ80N were found to be correct except for one: X15764's SAO number should be 99169 instead of 99168. SAO 99168 is X15763, but the number was missing in XZ80N. In XZ80N the SAO number 99169 was given to X15765, which was a duplicate of X15764 and was deleted in XZ80P. The following 92 SAO numbers were missing in XZ80N. X 1201 = SAO 129022; X 1209 = SAO 129026; X 1260 = SAO 129047; X 1315 = SAO 129065; X 1316 = SAO 129066; X 1331 = SAO 129073; X 1338 = SAO 129075; X 1356 = SAO 129077; X 1358 = SAO 129079; X 1361 = SAO 129080; X 1366 = SAO 129082; X 1429 = SAO 129095; X 1497 = SAO 129119; X 1503 = SAO 129120; X 1508 = SAO 129121; X 1517 = SAO 129124; X 1525 = SAO 129127; X 1540 = SAO 129130; X 1542 = SAO 129132; X 1594 = SAO 129147; X 1600 = SAO 129151; X 1625 = SAO 129161; X 1629 = SAO 129164; X 1640 = SAO 129171; X 1643 = SAO 129173; X 1678 = SAO 129181; X 1764 = SAO 129205; X 1765 = SAO 129207; X 1767 = SAO 129208; X 1840 = SAO 129237; X 1868 = SAO 129241; X 1876 = SAO 129245; X 1895 = SAO 129258; X 2018 = SAO 129302; X15763 = SAO 99168; X15813 = SAO 137637; X15822 = SAO 137641; X15910 = SAO 137685; X15930 = SAO 137693; X15932 = SAO 137696; X15941 = SAO 137698; X15945 = SAO 137701; X15971 = SAO 137712; X15999 = SAO 137719; X16038 = SAO 137738; X16039 = SAO 137741; X16049 = SAO 137747; X16087 = SAO 137759; X16091 = SAO 137760; X16123 = SAO 137766; X16125 = SAO 137767; X16147 = SAO 137776; X16149 = SAO 137777; X16158 = SAO 137781; X16165 = SAO 137782; X16169 = SAO 137784; X16178 = SAO 137786; X16208 = SAO 137796; X16236 = SAO 137809; X16246 = SAO 137813; X16254 = SAO 137817; X16274 = SAO 137825; X16317 = SAO 137843; X16337 = SAO 137854; X16343 = SAO 137855; X16364 = SAO 137864; X16368 = SAO 137868; X16389 = SAO 137876; X16394 = SAO 137878; X16395 = SAO 137880; X16396 = SAO 137881; X16409 = SAO 137883; X16411 = SAO 137889; X16421 = SAO 137892; X16423 = SAO 137894; X16425 = SAO 137895; X16439 = SAO 137898; X16448 = SAO 137902; X16469 = SAO 99368; X16514 = SAO 137924; X16527 = SAO 137932; X16557 = SAO 137939; X16560 = SAO 137942; X16570 = SAO 137948; X16592 = SAO 137953; X16599 = SAO 137959; X16606 = SAO 137967; X16637 = SAO 137977; X16719 = SAO 137996; X16775 = SAO 138019; X16900 = SAO 138078; X16935 = SAO 138092 The following is noted. X16469 was identified with SAO 99368. In XZ80N X16468 was identified with SAO 99368, and X16469 had no SAO number, but in XZ80P X16468 was deleted as a duplicate of X16469 due to BD number error of X16468. X16801 was identified with SAO 99479, but their declinations were different by 1 arcmin. The source of the SAO position for this star was Yale Vol. 19 (Star No. 4215) and the Yale position agreed with SAO's, but we could not find a corresponding star at the place indicated by SAO or Yale. XZ's position agreed with AGK3, PPM, and HIP, so the Yale position must be a mistake. X22339 and X22340's SAO numbers were changed. See Sect. 12. X25154 was identified with SAO 186715. In XZ80N it was SAO 186717, and X25152 = SAO 186715 was deleted. In XZ80P SAO 186717 is regarded as a duplicate of SAO 186715. 7. ZC numbers All the ZC numbers given in XZ80N were found to be correct. The following 7 ZC numbers were missing in XZ80N. ZC 17 = X 143; ZC 141 = X 1387; ZC 159 = X 1508; ZC 260 = X 2467; ZC 345 = X 3186; ZC 391 = X 3541; ZC1592 = X16439 ZC 2359's XZ number was changed. See Sect. 12. 8. PPM numbers For the following double stars the PPM numbers are not given in XZ80P. X 2431 + X 2432 = PPM 144933 X 4534 + X 4535 = PPM 119146 X 6994 + X 6995 = PPM 400073 X23277 + X23278 = PPM 266613 X30683 + X30684 = PPM 240280 The identification with PPM was made by the positional data of XZ80N, so with the new data in XZ80P, some inconsistency may be found like X30310 noted below. The doubtful identifications that need to be checked with the new positions are listed below. X 3567 = PPM 118429 (X 3566 is close) X 7440 = PPM 94740 (X 7439 was closer to PPM 94740, but X 7439 was identified with PPM 94741) X20239 = PPM 197489 (X20238 is close) X22339 = PPM 265516 (X22340 is close) X25726 = PPM 268785 (PPM 268784 is close) X30992 = PPM 206778 (X30993 is close) X30310 = PPM 239702 (With the new positions, X30309 = PPM 239702 is better and is consistent with the PPM comment "PPM 239702's companion is SAO 164830, about 5 arcsec to the north east") X31265 = PPM 181577 (X31264 is closer to PPM 181577, but it is too bright) 9. AGK3 numbers 8297 stars had AGK3 numbers in XZ80N and they were all correct, but AGK3 numbers for 12114 stars were missing. They were added in XZ80P. The following should be noted. X 3454 This is AG+19 218, but the Dec was given as +12 deg at J2000 in XZ80N. The PMs in RA and Dec were also erroneous (very large). They were due to the errors in AGK3. The data for this star in XZ80P are from ACT. X 3567 This star is a component of a double star with X 3566 = AG+12 284. X 3567 is identified as AG+12 285, but it was not in AGK3. It was in AGK2. The data in XZ80P are from PPM. X 8083 This is AG+30 623. The positions and PMs in XZ80N had large errors due to the errors in AGK3 positions. The AGK2 data were correct. The data in XZ80P are from PPM. X14709 This is AG+09 1239. It was not in AGK3, but was in AGK2. The data of XZ80N are retained. X14720 This is AG+09 1241. It was not in AGK3, but was in AGK2. The data of XZ80N are retained. X14823 This is AG+08 1313. It was not in AGK3, but was in AGK2. The data in XZ80P are from ACT. X15416 This is AG+07 1413. The PM in Dec was erroneous (very large). It was not in AGK3, but was in AGK2. The data in XZ80P were obtained from the AGK2 data by assuming zero PM in Dec, and 9.999"/cy was assigned to the error in PM in Dec. X16894 This is AG+03 1526, but the Dec was given as -03 deg at J2000 in XZ80N. The PMs in RA and Dec were also erroneous (very large). It was not in AGK3, but was in AGK2. The data in XZ80P were obtained from the AGK2 data by assuming zero PMs in RA and Dec, and 9.999"/cy was assigned to the errors in PMs. X17671 This is AG+05 1663. The RA and PM in RA in XZ80N had large errors. The data were not the same as those in AGK3 (the errors in AGK3 were smaller), although the source was written as AGK3/XZ. The data in XZ80P are from PPM. 10. HD numbers HD numbers were copied from HIP and ACT. The HD numbers in ACT were the numbers copied from TYC. For some double stars, the same HD numbers are given for both components. For example, the HD numbers of X 2432 and X 2433 are both given as 10668. 11. Deleted stars 14 stars were deleted due to duplicates of other XZ stars, but the records for them are retained so that the record numbers coincide with the XZ numbers (Note that this cannot apply to the stars of XZ numbers beyond 32221, which were taken from XZ94F). The alternative XZ numbers of the deleted stars are given in the DM number bytes (e.g. X 2262 is a duplicate of X 2263, so bytes 7-16 of X 2262 are given as "X 2263"). The declinations of those deleted stars were changed to -90 deg, and 40 was added to their magnitudes. Other bytes of the deleted stars were left blank. Of all the 14 deleted stars, the following 11 stars had already been deleted in XZ80N: X 2262 = X 2263; X 2786 = X 2787; X 6144 = X 6143; X 7879 = X 7874; X 8390 = X 8391; X 9018 = X 9017; X 9453 = X 9452; X15198 = X15197; X17420 = X17419; X25152 = X25154; X32172 = X32173 The following 3 stars were newly deleted in XZ80P: X15765 = X15764 (This was due to the SAO number error of X15764; see Sect. 6) X16468 = X16469 (This was due to the BD number error of X16468; it was given as BD+10 2325 but it should have been BD+10 2225) X16755 = X16756 (This was due to the BD number error of X16755; it was given as BD+02 2891 but it should have been BD+02 2391) 12. Problems of double stars There were a lot of stars whose positions in XZ80N were for the mean positions of two or more components of double stars, but in the HIP double/multiple systems annex, many of those components were given separately. For most of those cases the mean positions calculated from the HIP data were written in XZ80P, and the data of the position angles and separations were added to the double star data file (DSFILE). But in the cases where one of the components were given separately in XZ80N, problems arose as given below. ZC 2059 (668 B. Vir, SD-07 3834) is a double star, and the mean position of the two components was given in the ZC catalog (Robertson 1940). In XZ80N both components were given separately as X20238 (DSC=M) and X20239 (DSC=A), so X20238's DSC=M was erroneous. ZC 2059 was identified with X20238 in XZ80N, but the truth was that ZC 2059 was the mean of X20238 and X20239. The identification ZC 2059 = X20238 was succeeded in XZ80P, but the DSC was changed to N for X20238 (A was kept for X20239), and the secondary DSC's were given as N for X20238 and S for X20239. ZC 2359 (rho Oph, CD-23 12861) is a double star, and the mean position of the two components was given in the ZC catalog. In XZ80N it was X22340 (DSC=M), and one component of them was given separately as X22339 (DSC=E). In the HIP double/multiple systems annex, the two components were given separately as HIP 80473 (CCDM 16255-2327) A and B, and X22339 was identified with HIP 80473 A, which happened to be the brighter component, and as a result X22340 was identified with the fainter component HIP 80473 B, and its DSC was changed to E in XZ80P (X22339's DSC was changed to D). So the problem arose: Which of the two stars (X22339 and X22340) should be identified with ZC 2359? ZC 2359 was originally the mean of the two components (X22339 and X22340 in XZ80P), and it was X 22340 in XZ80N, but in XZ80P, X22339 is given as ZC 2359, and X22340 is regarded as a companion of ZC 2359 (the star name fields were changed as such). X22339 = SAO 184381 and X22340 = SAO 184382 were identified in XZ80N based mainly on the magnitudes, but from the positions and magnitudes from HIP, X22339 = SAO 184382 and X22340 = SAO 184381 are correct and are given in XZ80P. ZC 3228 (29 Aqr, DX Aqr, SD-17 6422) is a double star, and the mean position of the two components was given in the ZC catalog. In XZ80N it was X 30310 (DSC=M), and one component of them was given separately as X 30309 (DSC=E). In the HIP double/multiple systems annex, the two components were given separately as HIP 108797 (CCDM 22024-1658) A and B, and X 30309 was identified with HIP 108797 B. As a result X 30310 was identified with HIP 108797 A, but the VT magnitudes (A = 7.22, B = 7.09) of the two components in HIP are inconsistent with the magnitudes in WDS (A = 7.2, B = 7.4), which might be due to the systematic differences between the V and VT magnitudes. In XZ80P, X 30310 is given as ZC 3228, and the DSC's were changed to P for X 30309 and F for X 30310. ZC 3344 (231 B. Aqr, SD-04 5757) is a double star, and the mean position of the two components was given in the ZC catalog. In XZ80N it was X30993 (DSC=M), and one component of them was given separately as X30992 (DSC=E), but the positions do not match well with HIP. In XZ80P the two components are given as X30992 (DSC=E) and X30993 (DSC=D), and ZC 3344 was identified with the brighter component X30993. 1999 January 20 Mitsuru Soma ****** ******************************************************************* * Following is that part of the documentation for XZ80N that sets * * out some of the history behind its creation. * ******************************************************************* ======================================================================== ======================================================================== DESCRIPTION OF XZ CATALOG OF ZODIACAL STARS David W. Dunham, Wayne H. Warren Jr. 1994 June 18 The XZ catalog was created at the U. S. Naval Observatory in 1977 by Richard Schmidt and Tom Van Flandern, primarily for the purpose of generating predictions of lunar occultations, and for analyzing timings of these events. It was designed to include all stars from Robertson's Zodiacal Catalog (ZC), the SAO catalog, and the AGK3 catalog that are within 6d 40' of the ecliptic, which is as far as the Moon's limb can ever get as seen from anywhere on the Earth's surface, leaving some margin for stellar proper motions and change in the obliquity of the ecliptic over the course of three centuries. Hereafter, this region will be called "the Zodiac". The catalog contains 32,221 entries. Two years after the catalog was created, and observations were already reported using its numbers, it was found that about 200 stars near the equator from the AGK3 catalog were outside the Zodiac, and a similar number that should have been included were not. Since the numbering system had already been established, the catalog was not changed to correct this deficiency. Over the years, some errors in the catalog, due mainly to errors in the SAO and AGK3, were corrected. A few stars with very bad data were "eliminated" by changing their declination to -89d and adding 40 to their magnitudes. In 1986, most of the stellar positional data were replaced with improved data from Harrington's and Douglass' Zodical Zone (ZZ) catalog, which used for its observing list SAO stars in the Zodiac (actually, broader than the XZ Zodiac since ecliptic latitudes to +/-15d were used) north of declination approximately -25d. The positional data for many of the stars south of declination -25d with right ascensions greater than 18h were improved with data from the Lick Voyager Uranus catalog. In 1991, the photographic magnitudes of the AGK3 stars not in the SAO were converted to photovisual magnitudes by applying corrections based on the star's spectral type, when available. Stellar magnitudes and double-star codes have been updated periodically based on reports from observers. Each time a series of updates was made, the XZ version was changed. The current version is XZ80N, created during the summer of 1992. Late in the summer of 1992, Mitsuru Soma in Japan created a J2000 version of the XZ, which we call XZ80NJ2. The next update is planned for late 1994, when the positional data may also be replaced with PPM data; probably only the J2000 version will be updated. The XZ catalog is no longer maintained at the U. S. Naval Observatory (USNO); it is now maintained by the International Occultation Timing Association (IOTA). The changes made to the different versions of the XZ catalog during the past several years have been documented in the Occultation Newsletter, IOTA's quarterly publication. ======================================================================== ======================================================================== ******************************************************************* * A major development of the XZ catalogue was the expansion from * * the original 32221 stars to ~54000 stars, that occurred in the * * XZ94 versions of the XZ catalogue. The following information * * about the XZ94 versions of the catalogue was provided by * * Wolfgang Zimmermann, the creator of those versions. * ******************************************************************* ======================================================================== HISTORY OF THE XZ94 CATALOGS Wolfgang Zimmermann ======================================================================== In 1993 time 3 versions of the XZ80 catalogs were distributed: XZ80JA, XZ80L, and XZ80N (B1950.0/FK4). In 1993 the ESOP took place in Roden, Netherlands. There we decided: * In the future J2000.0/FK5 shall be used. * PPM stars should be identified in the XZ80 and the coordinates should be replaced by PPM coordinates. * The (visual) magnitudes of the XZ80 must be preserved. This was the way how I created the first XZ94 catalog. The following text is taken from the documentation delivered with the catalog. ======================================================================== Version 94A (November 1994) ======================================================================== This version is given for J2000.0/FK5. No B1950.0/FK4 version will be created. Stars which do not exist logically were removed physically. These are: XZ 2262 XZ 2786 XZ 6144 XZ 7879 XZ 8390 XZ 9018 XZ 9453 XZ15198 XZ17420 XZ25152 XZ32172 Most of the XZ stars were identified in the PPM. The PPM positions are better than the XZ position. The mean error in R.A. and declination for 1990 is .315" for the XZ, .274" for PPM-North, .113" for PPM-South, and .19" for PPM 90000 Stars Supplement. Consequently the positions and proper motions of the XZ80N were replaced by PPM values, if possible. The XZ was designed for the prediction of occultations by the moon (not by planets). The moon can move in a strip of approximately 7 degrees around the ecliptic. Stars from other catalogs which were not in the XZ80N were added and supplied with XZ numbers starting with 32301. Thus, 2 ranges of numbers exist for the XZ94A: 1 - 32221 (32210 stars) and 32301 - 53999 (21697 stars). ======================================================================== Version 94B (December 1994) ======================================================================== The contents of cols. 75 - 77 and 78 - 80 were interchanged [the data was in the incorrect column.] 75 - 77 = standard error for the proper motion in right ascension 78 - 80 = standard error for declination in arc seconds] ======================================================================== Version 94C (January 1995) ======================================================================== Double star codes had erroneously not been included in col. 15. The double star codes were added. XZ 34078 was identified as a duplicate of XZ 13342. As a result of this detection the XZ94 was again checked for duplicates. 13 additional duplicates were found. 1 star was deleted, because it had no proper motions. 2 of the 13 duplicates were already in the XZ80N. In this list of the corrections, the first-mentioned star was deleted: XZ 16468 = XZ 16469 (BD number for XZ16468 was wrong) XZ 16756 = XZ 16755 (BD number for XZ16755 was wrong) XZ 32922 = XZ 2930 XZ 33611 = XZ 33612 XZ 33806 = XZ 9017 (error caused by a duplicate in the C catalogue) XZ 33949 = XZ 33950 XZ 34012 = XZ 12009 (error caused by a duplicate in Lick Voyager catalogue) XZ 34078 = XZ 13342 XZ 34847 = XZ 18179 XZ 34853 = XZ 18185 XZ 34875 = XZ 18208 XZ 34891 = XZ 18224 XZ 47858 = XZ 28110 XZ 48663 = XZ 28642 XZ 53999 = XZ 32159 (error caused by a duplicate in ACRS catalogue) ======================================================================== Version 94D (February 1995) ======================================================================== All new stars in the XZ which had a distance of 3 arcseconds or less to old stars were identified as possible duplicates. It was very difficult and time consuming to verify the stars as separate stars or duplicates. But some general experiences could be made. Duplicates with one component from the J catalog are duplicates in a lot of cases, but not always. The J catalog is an USNO catalog created for a lunar eclipse. Fainter stars were put into it, but also stars which were already in the XZ80. Coordinates were taken from rather old catalogs like the AC. Thus, these duplicates can have a separation of up to 3 arcseconds. In the past I hesitated to remove them. Now I searched the candidates in the Guide Star Catalog - without success. Stars of mag. 10 were shown, but not another component of mag. 8, as the J catalog requires. In this list of the corrections, the first-mentioned star was deleted: XZ 43298 = XZ 43302 XZ 15765 = XZ 15764 XZ 31264 = XZ 31265 XZ 33774 = XZ 8391 [XZ 33774 came from the C catalog] XZ 33842 = XZ 9470 XZ 34764 = XZ 34765 XZ 34779 = XZ 18115 XZ 34789 = XZ 18129 XZ 34828 = XZ 18167 XZ 34864 = XZ 18204 XZ 34908 = XZ 34907 XZ 35490 = XZ 18886 [Duplicate in the Perth70 catalog] ======================================================================== Version 94E (August 1996) ======================================================================== The XZ was checked against other catalogs, comparing coordinates. The following corrections were made: The following stars were added in XZ80E XZ 15765 XZ 16468 XZ 16756 XZ 31264 XZ 54001 - XZ 54094 [Note XZ 31264 was added again. It has double star code E, i.e. "separate entry of a double star". XZ 31265 has double star code X, i.e. "probably close pair".] The following stars were deleted in XZ80E XZ 2431 XZ 4535 XZ 32990 XZ 33840 XZ 33958 XZ 33994 XZ 34075 XZ 34107 XZ 34284 XZ 34310 XZ 34551 XZ 34780 XZ 34782 XZ 34784 XZ 34785 XZ 34788 XZ 34792 XZ 34793 XZ 34794 XZ 34796 XZ 34801 XZ 34802 XZ 34803 XZ 34804 XZ 34806 XZ 34807 XZ 34813 XZ 34814 XZ 34821 XZ 34823 XZ 34824 XZ 34825 XZ 34831 XZ 34833 XZ 34843 XZ 34845 XZ 34846 XZ 34858 XZ 34860 XZ 34861 XZ 34862 XZ 34868 XZ 34869 XZ 34873 XZ 34874 XZ 34880 XZ 34882 XZ 34883 XZ 34888 XZ 34889 XZ 34896 XZ 34898 XZ 34901 XZ 34905 XZ 34924 The following Flamsteed numbers could not be verified and were removed: 30 B. Cnc (XZ 12360) 292 B. (Ori)/Gem (XZ 8867) There were also numerous corrections to catalogue cross-reference identifiers. ======================================================================== Corrections in version 94E (November 1997, never released) ======================================================================== In this list of the corrections, the first-mentioned star was deleted: XZ 32385 = XZ 64 XZ 32728 = XZ 1195 XZ 32876 = XZ 2392 XZ 33184 = XZ 33185 XZ 34313 = XZ 16397 XZ 54034 = XZ 21252 XZ 54044 = XZ 23014 XZ 54066 = XZ 26057 XZ 54084 = XZ 28741 ======================================================================== ======================================================================== ******************************************************************* * Following are Historical notes concerning the * * B+M, C, E, J, K, and L catalogues. * ******************************************************************* David Dunham created other star catalogs for special occultation predictions at USNO. In 1977, the K-catalog was created just before the XZ, to include AGK3 and southern Yale catalog stars. In 1978, after the XZ was established and used for occultation predictions, the K-catalog was modified so that it would exactly supplement the XZ, but without changing the sequence, since predictions had already been distributed and observations reported using K-catalog numbers in 1977. Most (but not all) of the AGK3 stars in the K-catalog are also in the XZ, so these were "removed" by changing the degrees of declination of these stars in the K-catalog to -89. So although there are still over 7000 entries in the K-catalog, only several hundred of them are valid. The other catalogs do not cover the whole Zodiac, but only certain fields of special interest, such as galactic clusters and star fields that were traversed by the Moon during total lunar eclipses. These catalogs include stars down to 11th and 12th magnitude usually obtained from the Astrographic Catalogs. They were cross-referenced with the XZ, and the data of matched stars replaced with XZ data. The occultation prediction program at USNO required stars be located at every hour of right ascension. Therefore, "spacer" entries were needed for these catalogs to fill this requirement. The magnitudes of these false-star entries were given as either 40 or 50 and the declinations as either -89d or -90d. The other catalogs are listed below. Occultation Cat. Newslet. Ref. Name Vol./No./pages Brief description 5BM 1/ 4/ 29-31 For 1975 May lunar eclipse 2/ 4/ 37 M, mainly for 1979 eclipses 3/ 1/ 3 B, for 1981 eclipses "5BM" is an RA-sorted combination of the above 3 catalogs E 3/ 12/249 For eclipses in 1985 and 1986 3/ 16/345 J 1/ 13/138-139 Hyades, Milky Way, 1977 eclipses, 1/ 14/145-147 other clusters 1/ 16/170 C 2/ 14/188-189 Milky Way, 1982 eclipses, clusters 2/ 16/222-224 K 1/ 13/138-139 See above L 4/ 11/263-266 1989-90 eclipses, Lick-Voyager cats. 4/ 12/301 4/ 14/336 ======================================================================== ========================================================================