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III/182             HDE Charts: positions, proper motions    (Nesterov+ 1995)
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The Henry Draper Extension Charts: A catalogue of accurate positions,
proper motions, magnitudes and spectral types of 86933 stars.
     Nesterov V.V., Kuzmin A.V., Ashimbaeva N.T., Volchkov A.A.,
     Roeser S., Bastian U.
     <Astron. Astrophys. Suppl. Ser. 110, 367 (1995)>
     =1995A&AS..110..367N
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ADC_Keywords: Positional data ; Proper motions ; Spectral types
Keywords: catalogs - astrometry - stars: fundamental parameters -
          stars: variables: general

Description:
    This document is intended to serve as a short description of the data
    files of the catalogue of 88883 stars of the Henry Draper Extension
    Charts. Detailed explanation of the Extension, catalogue production
    and so on may be found in the printed paper referenced above.

    There are two files comprising the catalogue, namely data file
    (catalog.dat) and individual remarks file (remarks.txt). The format of 
    the second one is free - it starts with 6-digits HDE number followed by
    remark text.

    The catalog.dat file contains 88883 logical records of the length 61 
    bytes each. A detailed description of the record format is given below.

Abstract of Paper:
    The Henry Draper Extension Charts (Cannon et al., 1949), published in
    the form of finding charts, provide spectral classification for some
    87000 stars mostly between 10th and 11th magnitude. This data, being
    highly valuable, as yet was practically unusable for modern
    computer-based astronomy. An earlier pilot project (Roeser et al.
    1991) demonstrated a possibility to convert this into a star
    catalogue, using measurements of cartesian coordinates of stars on the
    charts and positions of the Astrographic Catalogue (AC) for subsequent
    identification. We present here a final HDEC catalogue comprising
    accurate positions, proper motions, magnitudes and spectral classes
    for 86933 stars of the Henry Draper Extension Charts.

References:
  Cannon A.J., Mayall M.W., 1949, Ann. Harv. Coll. Obs. 112
  Roeser S., Bastian U., Wiese K., 1991, A&AS 88, 277


File Summary:
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 FileName    Lrecl    Records    Explanations
--------------------------------------------------------------------------------
ReadMe          80          .    This file
catalog.dat     67      88883    The catalogue
remarks.txt     70       1148    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-  6  I6     ---       HD        [272151/359083]+= HD number
       7  A1     ---       m_HD      Component identification: A, B...
       9  A1     ---       n_HD      [R] 'R' if individual remark for this star
                                       is given in the 'remarks' file
  11- 12  A2     ---       Sp        Spectral class
  14- 17  F4.1   mag       Mag       Magnitude - photographic or J/V (2)
      19  A1     ---       PosSource [PCAGMV] Position source flag (1)
  21- 22  I2     h         RAh       Right Ascension J2000.0 (hours)
  24- 25  I2     min       RAm       Right Ascension J2000.0 (minutes)
  27- 31  F5.2   s         RAs       [0/60] Right Ascension J2000.0 (seconds)
      33  A1     ---       DE-       Declination J2000.0 (sign)
  34- 35  I2     deg       DEd       Declination J2000.0 (degrees)
  37- 38  I2     arcmin    DEm       Declination J2000.0 (minutes)
  40- 43  F4.1   arcsec    DEs       [0/60] Declination J2000.0 (seconds)
      45  A1     ---       pmFlag    [TF] If T (TRUE), proper motions are 
                                       present; if F (FALSE) only the Epoch is 
                                       present
  46- 52  F7.3   arcsec/yr pmRA      ?Annual proper motion in RA (if pmFlag=T)
  53- 59  F7.3   arcsec/yr pmDE      ?Annual proper motion in DE (if pmFlag=T)
  60- 67  F8.3   yr        Epoch     [1891/1989]? Observation epoch
                                       in julian years (if pmFlag=F)
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Note (1): Position source is
      P = PPM (Roeser et al., 1993, "PPM Star Catalogue", Vol. I-IV,
          Spektrum Akademischer Verlag, Heidelberg
      C = GSC-AC (Guide Star and Astrographic Catalogues)
      A = AC (Astrographic Catalogue)
      G = GSC (Guide Star Catalogue)
      M = Miscellaneous
      V = Variables only found in GCVS or CSVS (General Catalogue of Variable
          stars or Catalogue of Suspected Variable Stars)
Note (2): magnitudes are either the AC B-magnitudes (when PosSource is
      'P', 'A' or 'C') or the GSC V/J magnitudes (when PosSource is 'G')
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Courtesy: Siegfried Roeser <S19@MVS.URZ.UNI-HEIDELBERG.DE>

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(End)                                    Francois Ochsenbein [CDS]   18-May-1995