File Summary: -------------------------------------------------------------------------------- FileName Lrecl Records Explanations -------------------------------------------------------------------------------- ReadMe 80 . This file ident.dat 89 9455 Combined identifications of reference stars ident_raw.dat 89 37491 Raw identifications of reference stars star_ids.dat 97 9455 Designations of reference stars star_pos.dat 67 9365 Positions and magnitudes of reference stars -------------------------------------------------------------------------------- Byte-by-byte Description of file: ident.dat ident_raw.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 6 I6 --- Key ?Reference star key (main HD number) (1) 8- 14 F7.2 arcmin dRA ?Difference in right ascension.cos(DE) (2) 16- 22 F7.2 arcmin dDE ?Difference in declination (2) 24- 29 F6.2 arcmin dist ?Distance from associated object (2) 31- 33 A3 --- BCon ?Bayer constellation (3) 35- 37 A3 --- BLet ?Bayer letter (3) 39 A1 --- BInd ?Bayer index (3) 41- 43 A3 --- FCon ?Flamsteed constellation (3) 45- 47 I3 --- FNum [1-141]? Flamsteed number (3) 49- 52 I4 --- HR [1-9110]? Bright Star catalog number 53 A1 --- HR_fl [*]? Next HR number included 54- 59 I6 --- HD [1-359083]? Henry Draper catalog number 60 A1 --- HD_fl [*]? Next HD number included 61- 66 I6 --- HIP [1-120416]? Hipparcos catalog number 68- 73 I6 --- SAO [1-258997]? SAO catalog number 74 A1 --- SAO_fl [*]? Next SAO number included 75- 78 A4 --- Com ?Component letter(s) (4) 80- 84 F5.2 --- Mag ?Magnitude (5) 85 A1 --- Shr [*]? Asterisk if shared magnitude 87- 89 A3 --- Src Source catalog (HR|HD|HIP|SAO) (6) ------------------------------------------------------------------------------- Note (1): the unique identifier of the reference star (which happens to be the HD number of its main component). This field is blank on continuation lines for the current star. Note (2): difference (Catalog - Reference) where Catalog is specified by Src. Note (3): the Bayer/Lacaille and Flamsteed designations according to the Bright Star catalog. The complete Bayer/Lacaille and Flamsteed designations are given in the file star_ids.dat. Note (4): component letters acccording to the Hipparcos catalog or sometimes the SAO or HR catalog. Note (5): magnitude from the catalog specified by Src. Note (6): in ident_raw.dat, Src specifies the source of the current lines's data; in ident.dat, Src specifies the source of the position (used to compute distances) and magnitude. -------------------------------------------------------------------------------- Byte-by-byte Description of file: star_ids.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 6 I6 --- Key ?Reference star key (main HD number) 8- 10 A3 --- BCon ?Bayer constellation 12- 14 A3 --- BLet ?Bayer letter 15 A1 --- IFlag [*]? Indexless flag (1) 16 A1 --- BInd ?Bayer index 18- 20 A3 --- BCon_ ?Second Bayer constellation 22- 24 A3 --- BLet_ ?Second Bayer letter 26 A1 --- BInd_ ?Second Bayer index 28- 30 A3 --- FCon ?Flamsteed constellation 32- 34 I3 --- FNum [1-141]? Flamsteed number 36- 38 A3 --- FCon_ ?Second Flamsteed constellation 40- 42 I3 --- FNum_ [1-141]? Second Flamsteed number 44- 47 I4 --- HR [1-9110]? Bright Star catalog number 48 A1 --- HR_fl [*]? Next HR number included 49- 54 I6 --- HD [1-359083]? Henry Draper catalog number 55 A1 --- HD_fl [*]? Next HD number included 56- 61 I6 --- HIP [1-120416]? Hipparcos catalog number 63- 68 I6 --- SAO [1-258997]? SAO catalog number 69 A1 --- SAO_fl [*]? Next SAO number included 70- 73 A4 --- Com ?Component letter(s) 75- 79 F5.2 --- Mag ?Magnitude 80 A1 --- Shr [*]? Asterisk if shared magnitude 81- 97 A17 --- Name ?Star name -------------------------------------------------------------------------------- Note (1): a * here indicates that this Bayer designation without index is also used to denote this star. -------------------------------------------------------------------------------- Byte-by-byte Description of file: star_pos.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 6 I6 --- Key Reference star key (main HD number) 8- 19 F12.9 hrs RAhrs RA decimal hours, epoch and equinox J2000.0 21- 32 F12.8 deg DEdeg DE decimal degrees, epoch and equinox J2000.0 34- 35 I2 h RAh RA hours, epoch and equinox J2000.0 37- 38 I2 min RAm RA minutes, epoch and equinox J2000.0 40- 46 F7.4 s RAs RA seconds, epoch and equinox J2000.0 48 A1 --- DE- DE sign, epoch and equinox J2000.0 49- 50 I2 deg DEd DE degrees, epoch and equinox J2000.0 52- 53 I2 arcmin DEm DE minutes, epoch and equinox J2000.0 55- 60 F6.3 arcsec DEs DE seconds, epoch and equinox J2000.0 62- 66 F5.2 --- Mag ?Magnitude 67 A1 --- Shr [*]? Asterisk if shared magnitude -------------------------------------------------------------------------------- History: * 2022-06-09: initial release. ================================================================================