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IV/12               SAO-HD-GC-DM Cross Index (ADC 1983)            (Roman+ 1983)
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SAO-HD-GC-DM Cross Index
     Roman N.G., Warren Jr. W.H., Schofield Jr. N.J.
    <Astronomical Data Center (1983)>
================================================================================
ADC_Keywords: Cross identifications

Description:
    The catalog is an updated, corrected, and extended version of a table
    of correspondences originally prepared by Morin (1973). The individual
    data corrections, additions, and changes included in the new version
    number 11398, with 8600 data records having at least one change. In
    addition to the correction of all errors found since preparation of
    the original catalog, most of which resulted from misidentifications
    and omissions of components in multiple-star systems and missing
    Durchmusterung numbers (the common identifier) in the SAO Catalog,
    component identifications from the Index Catalogue of Visual Double
    Stars (IDS) have been appended to all multiple SAO stars having the
    same DM numbers, and lowercase identifications for supplemental
    (footnoted) BD stars have been added. Stars deleted (duplicate
    entries) in the SAO Catalog have been appended with a "D" and their
    data removed, although the records have been kept (with SAO number
    only) in order not to change the number of SAO stars. The data include
    SAO number, HD number, HD multiplicity code, GC number, DM
    identification code (BD, CD, CP), and number. There are fewer objects
    than records because of the deleted entries appended with a "D" as
    described above (35 stars deleted).  A microfiche listing all changes made
    by the ADC in the early 1980's is available on request.  Please contact
    request@nssdca.gsfc.nasa.gov. 

File Summary:
--------------------------------------------------------------------------------
 FileName    Lrecl    Records    Explanations
--------------------------------------------------------------------------------
ReadMe          80          .    This file
adc.doc         80        440    Documentation NSSDC/WDC-A-R&S 91-20 (ascii)
adc.sty         78         68    ADC Style File (to process doc.tex)
adc.tex         80        407    Documentation NSSDC/WDC-A-R&S 91-20 (LaTeX)
index.dat       44     258944    The SAO-HD-GC-DM Cross Index
--------------------------------------------------------------------------------

See also:
    I/108   : Cape Photographic Durchmusterung (CPD) (Gill+ 1895-1900)
    I/113   : General Catalogue of 33342 stars (GC) (Boss 1937)
    I/114   : Cordoba Durchmusterung (CD) (Thome 1892-1932)
    I/119   : Southern Durchmusterung (BD) (Schoenfeld+ 1886)
    I/122   : Bonner Durchmusterung (BD) (Argelander 1859-62)
    I/131   : SAO Star Catalog J2000 (SAO Staff 1966; USNO, ADC 1990)
    III/135 : Henry Draper Catalogue and Extension (HD) (Cannon+ 1918-1924)
    III/182 : HDE Charts: positions, proper motions (Nesterov+ 1995)

Byte-by-byte Description of file: index.dat
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   Bytes Format Units   Label     Explanations
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   1-  6  I6    ---     SAO       [1/258997]+ SAO Catalog number
   7-  8  I2    h       RAh       Hours RA, equinox J2000
   9- 10  I2    min     RAm       Minutes RA, equinox J2000
  11- 12  I2    s       RAs       [0/60] Seconds RA, equinox J2000
      13  A1    ---     DE-       Sign Dec, equinox J2000
  14- 15  I2    deg     DEd       Degrees Dec, equinox J2000
  16- 19  F4.1  arcmin  DEm       [0/60.0] Minutes Dec, equinox J2000
  20- 32  A13   ---     DM       *Durchmusterung catalog ID
  33- 38  I6    ---     HD        [1/359083]? Henry Draper Catalog (HD) number
      39  A1    ---     m_HD     *[0129] HD number code (see comment)
  40- 44  I5    ---     GC        [1/33342]? Boss General Catalog (GC) number
--------------------------------------------------------------------------------
Note on DM: the Durchmusterung identification is made of
   DMcode in bytes 20-21 ("BD", "CD" or "CP")
   DMzone in bytes 30-32 (zone in degrees)
   DMnumb in bytes 33-36 (running number in zone)
   DMsupp in byte  32    ("a" or "b" for additional stars)
Note on m_HD: the multiplicity code contains:
   '0' Single star, or companion > 0.3 mag (visual) fainter
       than the primary to which the entry refers.
   '1' Brighter component with a companion <= 0.3 mag fainter.
   '2' Fainter component with a companion <= 0.3 mag brighter.
   '9' The SAO Catalog entry refers to two consecutive HD numbers,
       the lower of which is given.
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Historical Notes:
    See the documentation, either in LaTex (doc.tex), or in plain ascii
    (adc.doc), section 3.
    The catalogue distributed on the "Selected Astronomical Catalogs" Vol. 1
    CD-ROM (1992, Astronomical Data Center, NASA Greenbelt), directory
    /crossid/saohddm, contained two more data files not included here:
    the index sorted by right ascension and declination, and by
    HD numbers.

References:
   Morin D. 1973, Table of Correspondences SAO/HD/DM/GC, Obs. de Meudon,
      unpublished
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(End)      Gail L. Schneider [SSDOO/ADC], Francois Ochsenbein [CDS]  13-May-1996