IX/6 Positions of X-Ray Sources, 2nd ed. (Dolan 1983)
List of Positions of All X-Ray Sources with Positions Known More Accurately than those given in the 4U or 2A Catalogues, 2nd Edition Dolan J.F. <NASA/GSFC, private communication (1983)>
ADC_Keywords: X-ray sources ; Positional data Description: This catalog is a superset of the X-ray position list in the Astronomical Almanac (1983). It is designed as an aid to observers. Either one or two positions are given for each X-ray source. Identified counterparts are included for many sources. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file data.dat 156 704 X-ray position list notes.dat 68 553 Notes
Byte-by-byte Description of file: data.dat
Bytes Format Units Label Explanations
1- 8 A8 --- 4U Number of the source in the Uhuru 4U Catalog 10- 41 A32 --- Alt *Other names of the source 43- 45 I3 --- Note *Note in notes file. 47- 57 A11 "h:m:s" RA1 *Right Ascension (B1950) in sexagesimal units 59- 69 A11 "d:m:s" DE1 *Declination (equinox 1950) 71- 77 F7.3 deg RAdeg Right ascension (B1950) in degrees 79- 85 F7.3 deg DEdeg Declination in degrees (equinox 1950) 87- 92 F6.2 deg GLON *Galactic longitude, l(II), degrees 94- 99 F6.2 deg GLAT *Galactic latitude, b(II), degrees 101-105 I5 10fW/m2 Uflux *? 4U (2-6kev) flux (in 10^-11^erg/cm^2^/s) 107-120 A14 --- Osrc *Name of optical counterpart 122-125 F4.1 mag Vmag *? Magnitude of counterpart, V (see n_Vmag) 126-127 A2 --- n_Vmag *[ *V] Type of magnitude 129-131 A3 --- OType *[A CGHPQRST+] Type of object 133-143 A11 "h:m:s" RA2 *Right ascension, (1950) see bytes 47-57 145-155 A11 "d:m:s" DE2 *Declination, (1950) see bytes 59-69
Note on Alt: Other names of the source, separated by commas. If the source has an identified non-X-ray counterpart (see bytes 101-155 below) the first name in this field is the discovery designation. If this field contains a non-X-ray designation, but the source is not assigned a counterpart in bytes 101-155, then the identification is not regarded by Dolan as well-established. Note on Note: This number refers to the notes file, described in notes.dat below. The notes contain references and additional explanation. Note on RA1: Right ascension in hours, minutes and seconds, with colons (:) separating the units. The seconds, or the minutes and the seconds are often omitted. The least significant units may have a decimal fraction. Note on DE1: Declination in degrees, arc minutes, and arc seconds, with colons (:) separating the units. The seconds, or the minutes and the seconds are often omitted. The least significant units may have a decimal fraction. Note on GLON, GLAT: Galactic coordinates, calculated from the equatorial coordinates given in bytes 47-69. Note on Uflux, Osrc, Vmag: Data on objects with identified optical counterparts. The number of such objects is 346. Note on n_Vmag: * = B magnitude (otherwise the magnitude is V) V = variable star Note on OType: Two codes may be present, separated by a plus sign. The contents of this field are left justified. A = globular cluster C = cluster of galaxies G = galaxy H = HII region P = pulsar Q = quasi-stellar object R = supernova remnant S = stellar T = transient (nova-like optically) Note on RA2, DE2: In some cases a second set of coordinates may be present. They are equatorial coordinates, equinox 1950. These positions were used to calculate galactic coordinates are the first set.
Byte-by-byte Description of file: notes.dat
Bytes Format Units Label Explanations
1- 3 I3 --- Note *Note number 4 A1 --- flag [ :] ':' if this is the first record of a note 6- 68 A63 --- Text Text of note
Note on Note: This number is referred to in the flag in bytes 43-45 of data.dat of this catalogue. A note may take up more than one record. If so, all the records have the note number.
Historical Remarks: The Catalogue of X-Ray Positions was received from J.F. Dolan in June, 1983, as two machine-readable files of card images. The Astronomical Almanac list was selected from a subset which contains only sources with identified counterparts. For the present version, text editor line numbers were removed; the format of the notes was simplified; in-line documentation was removed (and used in this document); multiple data records for individual objects were combined into larger single records; galactic coordinates were calculated; the decimal degree equatorial coordinates were recomputed; redundant information, present in both of the component files, was edited to appear only once. The work on this catalogue revealed an erratum on page H65 of the Astronomical Almanac for 1984. G65.2 + 6.7 should be G65.2 + 5.7 (R.A. 19h 32m). This catalog was originally numbered VII/55 It supersedes the 3U list (Cat. IX/3, originally numbered VII/12) Acknowledgements: The original ADC documentation by Robert S. Hill (1984) was used to create this ReadMe file. References: Dolan, J. F., 1983, private communication. Nautical Almanac Office, United States Naval Observatory, 1983, The Astronomical almanac (United States Government Printing Office).
(End) C.-H. Joseph Lyu [Hughes STX/NASA] 14-Jan-1997
|The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line|