Detailed Description of Catalogue I/107A

I/107A       Washington Double Star Catalog (WDS)        (Worley+ 1984)
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The Washington Double Star Catalog
     Worley C.E., Douglass G.G.: 1984
     <US Naval Obs., unpublished (1984)>
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ADC_Keywords: Stars, double and multiple ; Positional data

Description:
    The Washington Visual Double Star Catalog, 1984.0 (WDS) is the
    successor to the Index Catalogue of Visual Double Stars, 1961.0
    (Jeffers et al., 1963), which is usually denoted as the IDS.
    The WDS is intended to contain all known visual double stars for which
    at least one differential measure has been published through the end
    of 1983. The reader is reminded that the WDS is therefore not
    inclusive of all pairs which have been more casually noted, although
    it does, in fact, include some of them. Approximately 384000
    individual means, representing over a million individual observations,
    form the basic material from which the WDS is constructed. Not
    included are a small amount of data because of unresolved questions
    concerning it. The WDS contains 73610 double stars, counting, as did
    the IDS, multiple components in the same system as separate pairs.

References:
  Jeffers H.M., van den Bos W.H., Greeby F.M., 1963, Publ. Lick. Obs. 21

File Summary:

  FileName      Lrecl  Records   Explanations

ReadMe             80        .   This file
doc.ori            79     2250   Original Documentation
wds                86    73610   The catalogue
notes              80     7766   Notes to the catalogue

See also:
    I/211 : CCDM (Components of Double and Multiple stars, Dommanget+ 1994)

Byte-by-byte Description of file: wds

   Bytes Format Units   Label     Explanations

   1-  2  I2    h       RAh       Hours RA, equinox 1900.0
   3-  5  I3    0.1min  RAdm      Minutes RA, equinox 1900.0
   6-  8  I3    0.1min  RAdm2000  ? Minutes RA, equinox 2000.0 (1)
       9  A1    ---     DE-       Sign Dec, equinox 1900.0
  10- 11  I2    deg     DEd       Degrees Dec, equinox 1900.0
  12- 13  I2    arcmin  DEm       [0/99]  Minutes Dec, equinox 1900.0
  14- 15  I2    arcmin  DEm2000   [0/99] Minutes Dec, equinox 2000.0 (1)
  16- 22  A7    ---     Disc      Discoverer code and reference number
                                  (See "doc.ori" for codes)
  23- 27  A5    ---     Comp      Component identification, when the object
                                    has more than two. (2)
  28- 31  I4    a       Date1     []? Date of the first satisfactory
                                      observation
  32- 35  I4    a       Date2     []? Date of the last satisfactory
                                      observation
  36- 37  I2    ---     NumObs    []? Number of measures of the object;
                                      when there are more than 99 measures,
                                      the number 99 is used
  38- 40  A3    deg     PosAng1   Position angle for Date1 (3)
  41- 43  A3    deg     PosAng2   Position angle for Date2
  44- 47  F4.1  arcsec  Sep1      []? Angular separation for Date1 (4)
  48- 51  F4.1  arcsec  Sep2      []?    Angular separation for Date2
  52- 55  F4.1  mag     Mag1      []? Magnitude of component 1
  56- 59  F4.1  mag     Mag2      []? Magnitude of component 2
  60- 61  A2    ---     Sp1       Spectral Type of component 1
  62- 63  A2    ---     Sp2       Spectral Type of component 2
      64  A1    ---     n_pmRA    [EW] Proper Motion Code 'E' (east, positive)
                                       or 'W' (west, negative)
  65- 67  I3    mas/a   pmRA      []? Proper motion in right ascension (5)
      68  A1    ---     n_pmDE    Proper Motion Code 'N' (north, positive)
                                       or 'S' (south, negative)
  69- 71  I3    mas/a   pmDE      []? Proper motion in declination (5)
  72- 79  A8    ---     DM        Durchmusterung catalog number, SZZNNNNN (6)
  80- 84  I5    ---     ADS       [1/17180]? ADS (Aitken's Double Star)
                                        designation
  85- 86  A2    ---     Code      [DNOPQR12346] Code (7)

Note (1): The 2000-epoch positions have nothing to do with the "J2000" system.
Note (2): The Lick IDS scheme has been continued, so that components
    referred to in earlier catalogs by small letters, a, b, etc.
    become upper case P, Q, etc. Thus, Aa becomes AP, Bb becomes BQ, etc.
Note (3): Position angle in degrees for Date1. For some pairs, the
    discoverers have given only crude estimates, such as NF or SP;
    in such cases these are listed. Position angles are unprecessed
    (i.e. they are for the mean date of observation.)
Note (4): Separations greater than 99.9 seconds of arc are treated
    by the codes (bytes 79-80), or in the notes. In cases where no
    appreciable motion was observed over the duration of observation,
    only PosAng1 and Sep1 are given.
Note (5): Units are seconds of arc per 1000 years unless the Code field
     is 'P' or 'R'. In these cases, the units are seconds of arc per
     100 years.
Note (6): The Durchmusterung number is based on the system used by the
     Henry Draper Catalog: +89 >= BD >= -22; -23 >= CD >= -51;
     -52 >= CP >= -89. When a star does not follow these standards,
     it is indicated in the notes.
Note (7): The notes have the following meaning (see also "doc.ori" file):
       D: Declination sign change. (Across equator).
       N: Notes found in the Notes table.
       O: Orbit. Where motion has exceeded 360 degrees, no values
          are listed in the position angle and separation fields.
          Orbits may be found in the "Fourth Catalog of Orbits of
          Visual Binary Stars" (Worley and Heintz, 1983), and in
          the Information Circulars published by Commission 26 of
          the IAU, as well as in the literature.
       P: 100 year proper motion in right ascension.
       Q: 100 year proper motion in declination.
       R: 100 year proper motion in right ascension and declination.
       1: One hundred seconds to be added to the separation.
       2: Two hundred seconds to be added to the separation.
       3: Three hundred seconds to be added to the separation.
       4: Four hundred seconds to be added to the separation.
       6: Separation given in minutes of arc rather than seconds.
       There are also a few non-explained codes:
         S (record 6838)
         7 (record 13287)
         M (record 73490)

Byte-by-byte Description of file: notes

   Bytes Format  Units   Label    Explanations

   1-  2  I2     h       RAh      []? Hours RA, epoch 1900.0
                                        (blank for continuation)
   4-  7  F4.1   min     RAm      []? Minutes RA, epoch 1900.0
   9- 17  A9     ---     Name     Name
  18- 80  A63    ---     Note     Text of note

Historical Notes:
   (Version 16-Mar-1994, Francois Ochsenbein, CDS)
   Compared to the CD-ROM edition "Selected Astronomical Catalogs Volume 1"
   (Lee E. Brotzman, Susan E. Gessner, Astronomical Data Center, NASA 1992),
   the following modifications have been performed at CDS on the "wds" file:
   * insertion of the decimal point in columns "Sep1", "Sep2" "Mag1", "Mag2"
     to ensure a correct interpretation (missing decimals) of these values
   * conversion of blank into zero in bytes 5 and 8
   * no 2000-position given for 20263+8948 (line 61554)
   * the following errors have been corrected in "wds" files:
     line  1179: column Sep1
     line  1926: columns Date1/2
     line 28457: bad declination corrected
     line 30269: column pmRA: "S" replaced by "W"
     line 32424: columns Date1/2
     line 36841: column Sep1
     line 49969: column ADS
     line 51102: columns Date1/2
     line 54828: column NumObs
     line 56061: column Sep1
     line 59078: column Sep1
     line 60767: column Sep1
     line 67108: column Mag1
  The description and ADC keywords were added at the ADC.

  * 02-May-1996: Dates of observations have been completed (original
    dates were offset by 1000)
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(End)                                    Francois Ochsenbein [CDS]   02-May-1996

CDS Catalogue Service