V/53A               Catalogue of the Brightest Stars  (Ochsenbein+ 1988)
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Le catalogue des etoiles les plus brillantes
Catalogue of the brightest stars
    Ochsenbein F., Halbwachs J.L.
   <Bull. Inform. CDS 32, 83 (1987)>
   =1987BICDS..32...83O
    Ochsenbein F., Acker A., Legrand E., Poncelet J.M., Thuet-Fleck E.
   <A.Acker (ed.), Strasbourg Obs. (1988)>
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ADC_Keywords: Stars, bright ; Combined data

Introduction au catalogue (version francaise):
    Ce catalogue fournit des donnees sur les 1628 etoiles brillantes de
    magnitude allant jusqu'a 5.01 contenues dans le "catalogue des etoiles
    les plus brillantes" de F. Ochsenbein et co. (1984), lui-meme derive
    de la 4eme edition du "Bright Star Catalogue" (Hoffleit 1982). Il
    differe de la version originale imprimee par les points suivants:
    - les designations des etoiles dane le catalogue Hipparcos, ainsi que
      les positions Hipparcos, exprimees dans l'International Celestial
      Reference System (ICRS), ont ete rajoutees (A)
    - les valeurs des parallaxes et mouvements propres ont ete remplacees
      par les valeurs du catalogue Hipparcos pour la quasi-totalite des
      etoiles (A)
    - les distances en annees-lumieres ont ete calculees  (A)
    - les coordonnees ecliptiques ont ete ajoutees aux donnees
      astrometriques.
    - la photometrie UBVRI a ete extraite du catalogue de Lanz (1986);
      ceci explique que trois etoiles soient de magnitude superieure a
      5.00 (HR 3229, HR 4392 et HR 6161). De plus, afin de faciliter les
      traitements par programme, on donne la valeur 99.99 en cas de mesure
      manquante (99.999 pour l'uvbyHbeta).
    - la lettre grecque "delta", qui apparaissait dans les types spectraux
      sous la forme codee "<04>" est maintenant ecrite en toutes lettres.
    - une colonne donnant la classe de luminosite en chiffre arabe a ete
      ajoutee a l'ecriture classique du type spectral.
    - le nombre de composantes des etoiles doubles visuelles (2) est donne
      explicitement.
    (A) indique les donnees ajoutees dans la version 'A'

Description:
    This catalogue provides data on the 1628 stars brighter than
    magnitude 5.01 contained in the "catalogue des etoiles les plus
    brillantes" by Ochsenbein et al. (1984), compiled from the fourth
    edition of The Bright Star Catalogue (Hoffleit 1982). It differs
    from the original printed version by the following points:
    - the star designations in Hipparcos catalogue were added, as well
      as the positions expressed in the International Celestial
      Reference System (ICRS) (A)
    - the parallax and proper motion data were replaced by the
      Hipparcos values for almost all the bright stars (A)
    - the distances (expressed in light-years) were computed (A)
    - ecliptic coordinates were added to astrometric data
    - UBVRI photometry was taken from Lanz (1986); for that reason,
      three stars (HR 3229, HR 4392 and HR 6161) are fainter than 5 mag.
      Moreover, the blanks due to unknown indices were filled with the
      value 99.99 (or 99.999 for the uvbyHbeta photometry).
    - the greek letter "delta" that appears in some spectral types is
      now written in latin letters instead of the code "<04>".
    - the luminosity classes are coded as integer numbers in an
      additional column.
    - the number of components of visual double stars is given.
    (A) indicates data added for version 'A'

File Summary:
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 FileName    Lrecl    Records    Explanations
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ReadMe          80          .    This file
catalog.dat    278       1628    The Catalogue
names.dat       18         80    Star names / Noms des etoiles
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See also:
    V/50 : The Bright Star Catalogue, 5th Edition
   I/239 : The Hipparcos and Tycho Catalogues (ESA 1997)

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]+ "Bright Star" catalog <V/50>
   6- 11  I6    ---     HD        [1/225300] Henry Draper" catalog <III/135>
  13- 15  I3    ---    Flamsteed  ? Flamsteed number
  18- 21  A4    ---     Bayer     Greek letter (lettre grecque)
  23- 25  A3    ---     Const     Constellation (3 characters)
  28- 37  A10   ---     VarName   Designation as Variable Star
  39- 40  I2    h       RAh       Right Ascension J2000 (hours)
  42- 43  I2    min     RAm       Right Ascension J2000 (minutes)
  45- 48  F4.1  s       RAs       Right Ascension J2000 (seconds)
      50  A1    ---     DE-       Declination J2000 (sign)
  51- 52  I2    deg     DEd       Declination J2000 (degrees)
  54- 55  I2    arcmin  DEm       Declination J2000 (minutes)
  57- 58  I2    arcsec  DEs       Declination J2000 (seconds)
  61- 66  F6.1  0.1s/a  precRA    Precession in RA for 10 years
  68- 71  I4 0.1arcsec/a precDE   Precession in DE for 10 years
  74- 79  F6.2  deg     ELON      Ecliptic longitude, J2000
  81- 86  F6.2  deg     ELAT      Ecliptic latitude, J2000
  88- 93  F6.2  deg     GLON      Galactic longitude
  95-100  F6.2  deg     GLAT      Galactic latitude
 102-105  I4    ---     HRm       [0,9110] 2nd HR number when combined (4)
 107-112  I6    ---     HIP       ?=0 Hipparcos (Cat. <I/239>) designation (4)
     114  A1    ---   n_HIP       [*] Note on Plx, pmRA, pmDE (4)
 115-117  I3    mas     Plx       ? Parallax from Hipparcos (1) (4)
 119-124  I6    mas/yr  pmRA      Proper motion (mouvement propre) in RA (4) (9)
 126-131  I6    mas/yr  pmDE      Proper motion (mouvement propre) in DE (4)
 133-142  F10.6 deg     RA(ICRS)  ? Right ascension from Hipparcos (10)
 144-153  F10.6 deg     DE(ICRS)  ? Declination from Hipparcos (10)
 155-159  I5    al      Dist      Distance of star in light-years (5)
     160  A1    ---   n_Dist      [ts] Trigonometric/Spectroscopic distance (5)
 162-165  I4    km/s    RVel      Radial velocity (vitesse radiale)
 167-170  A4    ---   n_RVel      [VSB12O? ]  Comment on RVel (3)
 172-176  F5.2  mag     Vmag      [-1.46/5.03] Visual magnitude
                                       (magnitude visuelle)
 178-182  F5.2  mag     B-V       ?=99.99  B-V (Johnson) index (2)
 183-187  F5.2  mag     U-B       ?=99.99  U-B (Johnson) index (2)
 188-192  F5.2  mag     V-R       ?=99.99  V-R (Johnson) index (2)
 193-197  F5.2  mag     R-I       ?=99.99  R-I (Johnson) index (2)
 199-204  F6.3  mag     b-y       ?=99.999 Stromegren index (2)
 205-210  F6.3  mag     m1        ?=99.999 Stroemgren index (2)
 211-216  F6.3  mag     c1        ?=99.999 Stroemgren index (2)
 217-222  F6.3  mag     Hbeta     ?=99.999 Stroemgren index (2)
     226  A1    ---   l_vsini     [:<] Limit flag for vsini (6)
 227-229  I3    km/s    vsini     ? Projected rotational velocity
                                   (projection de la vitesse de rotation
                                    sur la ligne de visee) (1)
     230  A1    ---   u_vsini     ':' for uncertainty (marque d'incertitude)
 231-235  F5.1  0.1nm   Wgamma    ? Equivalent width of H-gamma line
                                    (largeur equivalente de la raie Hgamma)
                                    (en Angstroem = 10-10m) (1)
 237-238  A2    ---     WilsonLC  Wilson Luminosity Class (7)
 239-257  A19   ---     SpType    MK Spectral Type
     258  I1    ---     LClass    [1/6]? Numeric Luminosity Class (classe de
                                          luminosite exprimee en chiffre) (1)
 260-261  I2    ---     nComp     [1/13]? Number of visual components
                                      (nombre de composantes visuelles)
 263-266  F4.1  mag     Dmag      ? Magnitude difference between components
                                       (difference de magnitude entre les
                                       composantes) Comp (1)
 268-273  F6.1  arcsec  Sep       ? Separation between Comp (1)
 275-278  A4    ---     Comp      Designation of components (8)
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Note (1): Field may be blank (la donnee peut etre inexistante)

Note (2): The value  99.99 or 99.999 indicates an unknown value
          (la valeur 99.99 ou 99.999 indique l'inexistance de la donnee)

Note (3): Note on RVel:
       V: variable velocity without known reason
          (vitesse variable sans raison determinee)
      SB: spectroscopic binary (binaire spectroscopique)
          SB1: one-spectrum binary (binaire a un spectre)
          SB2: two visible spectra (le deuxieme spectre est visible)
       O: known orbit (les elements orbitaux ont ete determines)

Note (4):
     Some close stars are combined in Hipparcos catalogue; the second
          HR number is then provided in the column HRm.
          The HRm column is zero in all other cases.
     (certaines binaires serrees ont des donnees Hipparcos qui
          combinent 2 etoiles, dont le numero HR est dans la colonne HRm;
          cette colonne HRm contient 0 pour les etoiles simples)
     Some bright stars, flagged by an * in column n_HIP, could not
          be resolved by Hipparcos; the parallax and proper motions are
          then taken from the Bright Star Catalogue.
     (Certaines etoiles brillantes n'ont pas de solution astrometrique
          dans Hipparcos; les parallaxes et mouvements propres affiches
          proviennent alors du "Bright Star" catalogue)
     The Hipparcos parallax has an accuracy almost always better than 1mas
     (la parallaxe Hipparcos a une precision generalement meilleure que 1mas)

Note (5): The distance, in light-years (1al=(1/3.26)pc) was computed from:
          (la distance, exprimee en annees-lumieres, est calculee par):
          - the trigonometric parallax (dist=3260/Plx) when n_Dist is 't';
            this method was adopted when the parallax is larger than 5mas
            (la parallaxe trigonometrique quand n_Dist contient 't',
             methode adoptee lorsque la parallaxe est d'au moins 5mas)
          - the spectroscopic distance, derived from the UBV photometry
            and the spectral classification, for distances over 650al
            (la distance spectroscopique, calculee a partir de la
             photometrie UBV et de la classification spectrale, a ete
             adoptee pour des distances depassant 650al)
          The accuracy of the distance should always be better than 20%.
          (La precision de la distance devrait etre meilleure que 20%)

Note (6): The ':' in the flag n_vsini stands for "less or equal"
          (le symbole ':' signifie "inferieur ou egal")

Note (7): only present when MK luminosity class absent
          (uniquement lorsque le type MK n'est pas complet)

Note (8): Designation of components concerned by columns Dmag and Sep
          (Designation des composantes concernees par Dmag et Sep);
          "O" designates a binary discovered by occultation methods
              (binaire decouverte par occultation)

Note (9): Proper motion contains the cos(DE) term (ce mouvement propre est
          la variation annuelle de RA * cos(DE))

Note (10): The Hipparcos positions are expressed in the ICRS system,
           close to J2000 FK5-based frame, at the epoch 1991.25
           which is the median epoch of the Hipparcos mission
           (les positions Hipparcos sont dans le systeme ICRS, qui est
           proche du systeme FK5 equinoxe J2000; les positions sont
           donnees pour l'epoque 1991.25, milieu de la mission Hipparcos)
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Byte-by-byte Description of file: names.dat
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   Bytes Format Units   Label     Explanations
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   1-  4  I4    ---     HR        Bright Star number
   7- 18  A12   ---     Name      Common name of the star / Nom usuel
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History:
  * The catalogue was first prepared in 1984 (Ochsenbein et al., 1984)
    and published by the Observatoire de Strasbourg
  * 31-May-1996: documentation standardized
  * 03-Feb-1999: Hipparcos data were added, and distances were computed.
    (F. Ochsenbein, CDS)
  * 24-Dec-2004: File "names.dat" added.

References:
   Hoffleit D. 1982, "The Bright Star Catalogue", 4th Edition (in
      collaboration with C. Jaschek), Yale Observatory
      (catalog <V/25>)
   Ochsenbein F., Acker A., Legrand E., Poncelet J.M., and Thuet-Fleck E.
      1984, "Catalogue des Etoiles les Plus Brillantes", ed. Acker A.,
      Observatoire de Strasbourg, Centre de Donnees astronomiques
      et Planetarium de Strasbourg
   Lanz T. =1986A&AS...65..195L (catalog <II/116>)
   "The Hipparcos and Tycho Catalogues", 1997, ESA SP-1200
      (See Cat. <I/239>)
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(End)                                     Francois Ochsenbein [CDS]  03-Feb-1999
