V/50           Bright Star Catalogue, 5th Revised Ed.     (Hoffleit+, 1991)
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The Bright Star Catalogue,  5th Revised Ed. (Preliminary Version)
     Hoffleit E.D., Warren Jr. W.H.
    <Astronomical Data Center, NSSDC/ADC (1991)>
    =1991bsc..book.....H
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ADC_Keywords: Combined data ; Stars, bright

Description:
    The  Bright  Star  Catalogue  (BSC) is widely used as a source of
    basic astronomical and astrophysical data for stars brighter than
    magnitude 6.5.   The  catalog  contains  the  identifications  of
    included stars in several other widely-used catalogs, double- and
    multiple-star  identifications,  indication  of  variability  and
    variable-star identifiers, equatorial positions for  B1900.0  and
    J2000.0,  galactic  coordinates,  UBVRI photoelectric photometric
    data when they exist, spectral types on  the  Morgan-Keenan  (MK)
    classification   system,   proper  motions  (J2000.0),  parallax,
    radial-   and   rotational-velocity   data,   and   multiple-star
    information  (number  of  components,  separation,  and magnitude
    differences) for known nonsingle stars.  In addition to the  data
    file, there is an extensive remarks file that gives more detailed
    information  on  individual  entries.   This information includes
    star  names,  colors,  spectra,   variability   details,   binary
    characteristics,  radial  and rotational velocities for companion
    stars,  duplicity  information,  dynamical  parallaxes,   stellar
    dimensions (radii and diameters), polarization, and membership in
    stellar groups and clusters.  The existence of remarks is flagged
    in the main data file.

    The  BSC  contains  9110  objects,  of  which  9096 are stars (14
    objects catalogued in the original compilation of 1908 are  novae
    or  extragalactic objects that have been retained to preserve the
    numbering, but most of their data are omitted), while the remarks
    section is slightly larger than the main catalog.    The  present
    edition of the compilation includes many new data and the remarks
    section has been enlarged considerably.

    This  preliminary version of the fifth edition of the Bright Star
    Catalogue supersedes the published and machine-readable  versions
    of  Hoffleit  (1982, Yale University Observatory) and is intended
    for use until the final version of this edition is completed.  It
    has  been  made  available  only   for   dissemination   on   the
    Astronomical Data Center CD ROM.

    The  brief  format description applies to the preliminary version
    of the catalog only.   The  format  will  change  for  the  final
    edition.


Author's addresses:
    Dorrit Hoffleit
        Department of Astronomy
        Yale University
    Wayne H. Warren Jr.
        ST Systems Corporation
        National Space Science Data Center
        NASA Goddard Space Flight Center


File Summary:
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 FileName    Lrecl    Records    Explanations
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ReadMe          80          .    This file
catalog.dat    197       9110    The main part of the Catalogue
notes.dat      132       9190    Remarks
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Byte-by-byte Description of file: catalog.dat
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   Bytes Format  Units     Label      Explanations
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   1-  4  I4     ---       HR         [1/9110]+ Harvard Revised Number
                                      = Bright Star Number
   5- 14  A10    ---       Name       Name, generally Bayer and/or Flamsteed name
  15- 25  A11    ---       DM         Durchmusterung Identification (zone in
                                      bytes 17-19)
  26- 31  I6     ---       HD         [1/225300]? Henry Draper Catalog Number
  32- 37  I6     ---       SAO        [1/258997]? SAO Catalog Number
  38- 41  I4     ---       FK5        ? FK5 star Number
      42  A1     ---       IRflag     [I] I if infrared source
      43  A1     ---       r_IRflag  *[ ':] Coded reference for infrared source
      44  A1     ---       Multiple  *[AWDIRS] Double or multiple-star code
  45- 49  A5     ---       ADS        Aitken's Double Star Catalog (ADS) designation
  50- 51  A2     ---       ADScomp    ADS number components
  52- 60  A9     ---       VarID      Variable star identification
  61- 62  I2     h         RAh1900    ?Hours RA, equinox B1900, epoch 1900.0 (1)
  63- 64  I2     min       RAm1900    ?Minutes RA, equinox B1900, epoch 1900.0 (1)
  65- 68  F4.1   s         RAs1900    ?Seconds RA, equinox B1900, epoch 1900.0 (1)
      69  A1     ---       DE-1900    ?Sign Dec, equinox B1900, epoch 1900.0 (1)
  70- 71  I2     deg       DEd1900    ?Degrees Dec, equinox B1900, epoch 1900.0 (1)
  72- 73  I2     arcmin    DEm1900    ?Minutes Dec, equinox B1900, epoch 1900.0 (1)
  74- 75  I2     arcsec    DEs1900    ?Seconds Dec, equinox B1900, epoch 1900.0 (1)
  76- 77  I2     h         RAh        ?Hours RA, equinox J2000, epoch 2000.0 (1)
  78- 79  I2     min       RAm        ?Minutes RA, equinox J2000, epoch 2000.0 (1)
  80- 83  F4.1   s         RAs        ?Seconds RA, equinox J2000, epoch 2000.0 (1)
      84  A1     ---       DE-        ?Sign Dec, equinox J2000, epoch 2000.0 (1)
  85- 86  I2     deg       DEd        ?Degrees Dec, equinox J2000, epoch 2000.0 (1)
  87- 88  I2     arcmin    DEm        ?Minutes Dec, equinox J2000, epoch 2000.0 (1)
  89- 90  I2     arcsec    DEs        ?Seconds Dec, equinox J2000, epoch 2000.0 (1)
  91- 96  F6.2   deg       GLON       ?Galactic longitude (1)
  97-102  F6.2   deg       GLAT       ?Galactic latitude (1)
 103-107  F5.2   mag       Vmag       ?Visual magnitude (1)
     108  A1     ---       n_Vmag    *[ HR] Visual magnitude code
     109  A1     ---       u_Vmag     [ :?] Uncertainty flag on V
 110-114  F5.2   mag       B-V        ? B-V color in the UBV system
     115  A1     ---       u_B-V      [ :?] Uncertainty flag on B-V
 116-120  F5.2   mag       U-B        ? U-B color in the UBV system
     121  A1     ---       u_U-B      [ :?] Uncertainty flag on U-B
 122-126  F5.2   mag       R-I        ? R-I   in system specified by n_R-I
     127  A1     ---       n_R-I      [CE:?D] Code for R-I system (Cousin, Eggen)
 128-147  A20    ---       SpType     Spectral type
     148  A1     ---       n_SpType   [evt] Spectral type code
 149-154  F6.3   arcsec/yr pmRA       ?Annual proper motion in RA J2000, FK5 system
 155-160  F6.3   arcsec/yr pmDE       ?Annual proper motion in Dec J2000, FK5 system
     161  A1     ---       n_Parallax [D] D indicates a dynamical parallax,
                                      otherwise a trigonometric parallax
 162-166  F5.3   arcsec    Parallax   ? Trigonometric parallax (unless n_Parallax)
 167-170  I4     km/s      RadVel     ? Heliocentric Radial Velocity
 171-174  A4     ---       n_RadVel  *[V?SB123O ] Radial velocity comments
 175-176  A2     ---       l_RotVel   [<=> ] Rotational velocity limit characters
 177-179  I3     km/s      RotVel     ? Rotational velocity, v sin i
     180  A1     ---       u_RotVel   [ :v] uncertainty and variability flag on
                                      RotVel
 181-184  F4.1   mag       Dmag       ? Magnitude difference of double,
                                        or brightest multiple
 185-190  F6.1   arcsec    Sep        ? Separation of components in Dmag
                                        if occultation binary.
 191-194  A4     ---       MultID     Identifications of components in Dmag
 195-196  I2     ---       MultCnt    ? Number of components assigned to a multiple
     197  A1     ---       NoteFlag   [*] a star indicates that there is a note
                                        (file notes.dat)
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Note (1): These fields are all blanks for stars removed from
    the Bright Star Catalogue (see notes.dat).
Note on r_IRflag:
  Blank if from NASA merged Infrared Catalogue, Schmitz et al., 1978;
      ' if from Engles et al. 1982
      : if uncertain identification
Note on Multiple:
      A = Astrometric binary
      D = Duplicity discovered by occultation;
      I = Innes, Southern Double Star Catalogue (1927)
      R = Rossiter, Michigan Publ. 9, 1955
      S = Duplicity discovered by speckle interferometry.
      W = Worley (1978) update of the IDS;
Note on n_Vmag:
  blank = V on UBV Johnson system;
      R = HR magnitudes reduced to the UBV system;
      H = original HR magnitude.
Note on n_RadVel:
     V  = variable radial velocity;
     V? = suspected variable radial velocity;
     SB, SB1, SB2, SB3 = spectroscopic binaries,
                         single, double or triple lined spectra;
      O = orbital data available.
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Byte-by-byte Description of file: notes.dat
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   Bytes Format  Units  Label     Explanations
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   2-  5  I4     ---    HR        [1/9110]+= Harvard Revised (HR)
   6-  7  I2     ---    Count     Note counter (sequential for a star)
   8- 11  A4     ---    Category *[A-Z: ] Remark category abbreviation:
  13-132  A120   ---    Remark    Remarks in free form text
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Note on Category: the following abbreviations are used:
    C   - Colors;
    D   - Double and multiple stars;
    DYN - Dynamical parallaxes;
    G   - Group membership;
    M   - Miscellaneous.
    N   - Star names;
    P   - Polarization;
    R   - Stellar radii or diameters;
    RV  - Radial and/or rotational velocities;
    S   - Spectra;
    SB  - Spectroscopic binaries;
    VAR - Variability;
    The category abbreviation is always followed by a colon (:).
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Historical Notes:
  * 02-Oct-1993 at CDS (Francois Ochsenbein)
    A few corrections have been inserted from the CD-ROM version
    "Selected Astronomical Catalogs, Volume 1, 1991, directory
    /combined/bsc5 at CDS with the agreement of Wayne H. Warren Jr:
    1. The spectral type for HR 6397 is from Walborn and contained octal 032
       (control-Z) characters instead of square brackets around the "n".
    2. Two remarks have been added for 6985 and 8817
    3. Byte 197 (NoteFlag) of "catalog" file corrected for stars
         202 7126 7482 7614 8982 (removed asterisk)
         285  342  841  843  991 1181 1553 1652 2269 2271 (added asterisk)
        2837 3133 3962 4522 4789 6692 7076 7328 8306 8667 (added asterisk)
  * 02-Nov-1995 at CDS (Francois Ochsenbein):
    Documentation slightly changed to accommodate to standards, and
    two lines which were inverted in "notes" have been replaced.
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(End)                                Francois Ochsenbein     [CDS]   02-Nov-1995
