I/175 Fifth Fundamental Catalogue (FK5) - Extension (Fricke+ 1991) ================================================================================ Fifth Fundamental Catalogue (FK5) Part II. The FK5 Extension Fricke W., Schwan H., CorbinT. (in collaboration with Bastian U., Bien R., Cole C., Jackson R., Jaehrling R., Jahreiss H., Lederle T., Roeser, S.) =1991VeARI..33....1F ================================================================================ ADC_Keywords: Positional data - 140; Proper motions - 665; Description: The FK5 Extension provides improved mean positions and proper motions for the 3117 new fundamental stars. The machine version of the catalog contains the positions and proper motions of the Extension stars for the epochs and equinoxes J2000.0 and B1950.0, the mean epochs of individual observed right ascensions and declinations used to determine the final positions, the mean errors of the final positions and proper motions for the reported epochs, and ancillary data such as magnitudes, spectral types, parallaxes, and radial velocities. Cross identifications to the numbering systems of the AGK3R, SRS, HD, DM, and GC catalogs are also included. Introduction: The Fifth Fundamental Catalogue (FK5) Part II (which may be referred to by the alternate name FK5 Extension) provides mean positions and proper motions at equinox and epoch J2000.0 for 3117 new fundamental stars. The purpose of the FK5, Part II, is mainly to extend the fundamental system defined by the FK5, Part I (the so-called Basic FK5; Fricke et al. 1988) to about magnitude 9.5. The positions and proper motions given in the FK5 Extension are in accordance with the IAU (1976) system of astronomical constants; this means that the proper motions are based on the new values for the precessional quantities, the terms of elliptic aberration are eliminated from the mean positions, the correction for the error in the FK4 equinox and its fictitious motion are applied, and the systematic corrections FK5-FK4, as given in the Basic FK5 (page 86), have been taken into account. More than 200 catalogs providing star positions obtained from throughout the world have been used in the compilation of the FK5 Extension. The source reference should be consulted, along with the FK5 Basic catalog (Fricke et al. 1988) for more detailed information regarding the motivation for construction of the FK5, the determination of its equator and equinox, the expressions for general precession, a discussion of the FK5 system, systematic differences between the FK4 and FK5, the transformation of observational catalogs to the FK5 system and to the reference system J2000.0, and more thorough descriptions of the data contained in the FK5 catalog. In fact, the source reference should be consulted by all users before utilizing the FK5 data for astrometric applications. The trigonometric parallax and radial velocity fields are blank when data are missing, and because parallax and radial velocity can validly be zero, the fields should be checked for blanks before the data are used. The user should note that the file is ordered by FK5 number, which means that the stars are arranged neither by right ascension nor by declination. See also: I/149 : Part I: Basic Fundamental Stars File Summary: -------------------------------------------------------------------------------- FileName Lrecl Records Explanation -------------------------------------------------------------------------------- ReadMe 80 . This file fk5e.dat 190 3117 FK5 Extension - Part II -------------------------------------------------------------------------------- Byte-by-byte Description of file: fk5e.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1-4 I4 --- FK5 *FK5 Extension number 6-7 I2 h RAh *Right ascension J2000.0 (hours) Equinox=J2000, Epoch=J2000 9-10 I2 min RAm *Right ascension J2000.0 (minutes) 12-17 F6.3 s RAs *Right ascension J2000.0 (seconds) 19-25 F7.3 s/ha pmRA *Centennial proper motion J2000.0 27-27 A1 --- DE- *Declination, J2000.0 (sign) 28-29 I2 deg DEd *Declination, J2000.0 (degrees) Equinox=J2000, Epoch=J2000 31-32 I2 arcmin DEm *Declination J2000.0 (minutes) 34-38 F5.2 arcsec DEs *Declination J2000.0 (seconds) 40-46 F7.2 arcsec/ha pmDE *Centennial proper motion J2000.0 48-49 I2 h RA1950h Right ascension B1950.0 (hours) in new system, Equinox=B1950, Epoch=B1950 51-52 I2 min RA1950m Right ascension B1950.0 (minutes) 54-59 F6.3 s RA1950s Right ascension B1950.0 (seconds) 61-67 F7.3 s/ha pmRA1950 Centennial proper motion B1950.0 69-69 A1 --- DE1950- Declination B1950.0 (sign) 70-71 I2 deg DE1950d Declination B1950.0 (degrees) in new system, Equinox=B1950, Epoch=B1950 73-74 I2 arcmin DE1950m Declination B1950.0 (minutes) 76-80 F5.2 arcsec DE1950s Declination B1950.0 (seconds) 82-88 F7.2 arcsec/ha pmDE1950 Centennial proper motion B1950.0 90-94 F5.2 a EpRA *Epoch (RA) 95-99 F5.1 ms e_RAs *Mean error in RA 100-105 F6.1 ms/ha e_pmRA *Mean error in centennial PM 107-111 F5.2 a EpDE *Epoch (Dec) 113-116 F4.1 10mas e_DEs *Mean error in Dec 118-122 F5.1 10mas/ha e_pmDE *Mean error in centennial PM 124-128 F5.2 mag Vmag *V magnitude 129 A1 --- n_Vmag *Magnitude flag 131-137 A7 --- Sp Spectral type(s) 139-145 F7.4 arcsec plx ?Parallax 147-153 F7.2 km/s RV ?Radial velocity 155-159 A5 --- AGK3R *AGK3R (catalog ) number 161-165 A5 --- SRS SRS (catalog ) number 167-172 A6 --- HD HD (catalog ) number 174-183 A10 --- DM *DM identification 186-190 A5 --- GC GC (catalog ) number -------------------------------------------------------------------------------- Note on FK5: These numbers begin at 2000 (the first is 2003) to distinguish them from the numbers in the Basic FK5. Note on RAh, RAm, RAs, DE-, DEd, DEm, DEs: The terms of elliptic aberration have been eliminated from the mean positions. The B1950.0 data have been computed from the J2000.0 data using a procedure described in the source reference based on the IAU (1976) system of astronomical constants (see also Lieske 1979). Note on pmRA and pmDE: Centennial values for J2000.0 and B1950.0, referred to one Julian century. Note on EpRA and EpDE: Mean epoch (-1900.0) of the individual observed right ascensions and declinations. Note on e_RAs, e_DEs, e_pmRA, e_pmDE: These mean errors do not include those of the FK5 system and of the equinox and equator. Note on Vmag: For physical double stars, the magnitudes of the brighter components are given (both are given in the published catalog). Note on n_Vmag: 'V' indicates that a range of magnitudes is given in the published catalog. 'v' indicates variability (amplitude exceeds 0.3 magnitude). Note on AGK3R: Only three stars (1367, 1553, 1598) in the Basic FK5 have this number. Note on DM: BD = Bonner Durchmusterung (Argelander 1859-62, Kuestner 1903 ) SD = Southern Durchmusterung (Schoenfeld 1886 ) CD = Cordoba Durchmusterung (Thome 1892- 1932 ) CP = Cape Photographic Durchmusterung (Gill and Kapteyn 1895-1900 ) -------------------------------------------------------------------------------- History: The machine-readable Fifth Fundamental Catalogue (FK5) Part II was received on magnetic tape from Dr. H. Schwan of the Astronomisches Rechen-Institut, Heidelberg on 19 August 1991. The logical record length of the catalog, as received, was 220 bytes. The following format changes were made by Wayne H. Warren Jr., (with Dr. Schwan's concurrence) in order to make the data easier to interpret and to conserve storage: 1. The DM identifiers, which were single-digit numerical codes, were changed to "BD", "CD", and "CP". 2. Plus signs were added to the trigonometric-parallax data, even though no negative parallaxes are included in the catalog, to indicate that negative parallaxes are possible. 3. Multiple blanks between data fields were removed, as were blanks beyond the end of each record, to decrease the logical record length from 220 bytes to 190 bytes. 4. Byte 129 (the variability flag) had only upper case "V" flags as received. These were left for cases where magnitude ranges are given in the published catalog, but were changed to lower case when a lower case "v" is reported in the published edition. Acknowledgements: Dr. H. Schwan and his colleagues at the Astronomisches Rechen-Institut generously reviewed a draft copy of the original documentation prior to its final release for distribution with machine-readable copies of the catalog, as did Dr. T. E. Corbin of the U. S. Naval Observatory. Dr. Warren prepared the original document which has been reformatted here in the new standard form. References: Corbin, T. E. 1978, in IAU Colloquium 48, Modern Astrometry, ed. F. V. Frochazka and R. H. Tucker (Vienna, University Obs.), p. 505 Fricke, W., and Kopff, A. 1963, Fourth Fundamental Katalog (FK4), Veroeff. Astron. Rechen-Institut Heidelb. No. 10. (Catalogue ) Fricke, W., Schwan, H., and Corbin, T. (in collaboration with Bastian, U., Bien, R., Cole, C., Jackson, R., Jaehrling, R., Jahreiss, H., Lederle, T., and Roeser, S.) 1991, Fifth Fundamental Catalogue FK5), Part II. The FK5 Extension, New Fundamental Stars, Veroeff. Astron. Rechen-Institut Heidelburg No. 33 Fricke, W., Schwan, H., and Lederle, T. (in collaboration with Bastian, U., Bien, R., Burkhardt, G., du Mont, B., Hering, R., Jaehrling, R., Jahreiss, H., Roeser, S., Schwerdtfeger, H. M., and Walter, H. G.) 1988, Fifth Fundamental Catalogue (FK5), Part I. The Basic Fundamental Stars, Veroeff. Astron. Rechen-Institut Heidelburg No. 32, catalog Lieske, J. H. 1979, A&A, 73, 282 Scott, F. P., and Smith, C. A., Jr. 1971, Comparison of the SAO and AGK3R Star Catalogues, in Conference on Photographic Astrometric Techniques, ed. H. K. Eichhorn, NASA CR-1825, catalog Smith, C. A., Corbin, T. E., Hughes, J. A., Jackson, E. S., Krutskaya, E. V., Polozhentsev, A. D., Polozhentsev, D. D., Yagudin, L. I., and Zverev, M. S. 1990, in IAU Symposium No. 141, Inertial Coordinate System on the Sky, ed. J. H. Lieske and V. K. Abalakin (Dordrecht, Reidel), p. 457 ================================================================================ (End) Nancy G. Roman [NSSDC/ADC] 08-Dec-1994