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I/163          US Naval Observatory Pleiades Catalog      (Van Flandern 1969)
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The U.S. Naval Observatory Pleiades Catalog
     Van Flandern T.C.
    <U.S. Naval Observatory, unpublished (1969)>
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ADC_Keywords: Positional data ; Proper motions ; Regional catalog

Description:
    This catalog is a special subset of the Eichhorn et al. (1970)
    Pleiades catalog (see <I/90>) updated to B1950.0 positions and with
    proper motions added. It was prepared for the purpose of predicting
    occultations of Pleiades stars by the Moon, but is useful for general
    applications because it contains many faint stars not present in the
    current series of large astrometric catalogs.

See also:
  I/90 : Positions of 502 Stars in Pleiades Region (Eichhorn et al., 1970)

File Summary:
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 FileName    Lrecl    Records    Explanations
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ReadMe          80          .    This file
catalog.dat     54        506    The catalog
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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  A1     ---        cat      [P] catalog designation
   2-  6  I5     ---        ID       [4/509]+ Sequential P catalog number
   8- 11  I4     ---        Hertz   *Hertzsprung (1947) number used in <I/90>
      12  A1     ---        m_Hertz  [A] Component in visual binary system
  13- 16  F4.1   mag        ptv     *Photovisual magnitude
  18- 19  I2     h          RAh      Right Ascension (equinox=B1950, epoch=B1950.0)
  21- 22  I2     min        RAm      Right Ascension B1950.0
  24- 29  F6.3   s          RAs      Right Ascension B1950.0
  32- 35  I4     0.1mas.yr  pmRA    *Proper motion in RA (B1950.0)
      37  A1     ---        DE-      [+/-] Sign of declination, B1950.0
  38- 39  I2     deg        DEd      Declination (equinox=B1950, epoch=B1950.0)
  41- 42  I2     arcmin     DEm      Declination B1950.0
  44- 48  F5.2   arcsec     DEs      Declination B1950.0
  51- 54  I4     0.1mas.yr  pmDE    *Proper motion in DE (B1950.0)
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Note on Hertz:
    Numbers are taken from the catalog of Hertzsprung (1947, Ann.
    Sterrew. Leiden, 19, 1A)
Note on ptv:
    Photovisual magnitudes are taken from the Eichhorn et al. (1970)
    catalog, rounded off to 0.1m.
Note on pmRA, pmDE:
    Proper motions are given as integers and can be read with format
    I4, in which case one should divide pmRA and pmDE by 100 to
    obtain centennial values in seconds of arc.
    To compute pmRA in seconds of time, the cosine factor must be
    accounted for, so divide pmRA by 15*cos DE.
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References:
  Eichhorn H., Googe W.D., Lukac C.F., Murphy J.K., 1970,
    Mem. Roy. Astron. Soc. 73, 125 (1970MmRAS..73..125E)  (Catalog <I/90>)
  Hertzsprung E., 1947, Ann. Sterrew. Leiden, 19, 1A
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(End)                            Wayne H Warren Jr [LASP/GSFC/HSTX]  12-Feb-1996