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/catalogs/1/1176/

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I/176               AGK3U       (Bucciarelli+ 1992)
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The AGK3U: an updated version of the AGK3
     Bucciarelli B., Daou D., Lattanzi M.G., Taff L.G.
    <Astron. J. 103, 1689 (1992)>
    =1992AJ....103.1689B
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ADC_Keywords: Positional data ; Proper motions

Description:
    The AGK3U is a updated version of the AGK3 catalog in which new
    positions from the Palomar "Quick V" survey have been added to improve
    the AGK3 proper motions. It provides FK4/B1950.0 positions and proper
    motions for 170,464 stars north of -2.5 degrees declination, at an
    average epoch of 1950.62. The proper motions have a two dimensional
    formal mean error of 0.82 arcsec/century.
    In addition to the positions and proper motions, the catalog contains
    the AGK3 number, the mean errors of the positions and proper motion in
    each coordinate, the photographic magnitude, the spectral type, and
    the Palomar plate position, epoch, and mean error.

File Summary:
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 FileName   Lrecl    Records    Explanations
--------------------------------------------------------------------------------
ReadMe         80          .    This file
catalog.dat   186     170464   *The AGK3U Catalogue
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Note on catalog.dat: there is no star between RA: 23 51 17.875 and 24h
     According to Larry G. Taff <LGTAFF@stsci.edu> in a message to
     Sergei Puliaev <puliaev@dans.on.br>: "We discovered, after the fact,
     that there was a problem with the coordinate transformations near
     the pole just prior to the equinox".
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See also:
     I/69 : AGK3 Catalog
    I/146 : Catalog of Positions and Proper Motions (PPM-North),
            with improved data for Northern stars
    I/220 : The Guide Star Catalog (GSC), V1.1

Byte-by-byte Description of file: catalog.dat
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   Bytes Format Units    Label    Explanations
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   2-  8  A7    ---      AGK3     AGK3 Number (1)
  11- 12  I2    h        RAh      Right Ascension B1950 (hours)
  14- 15  I2    min      RAm      Right Ascension B1950 (minutes)
  17- 22  F6.3  s        RAs      Right Ascension B1950 (seconds)
      24  A1    ---      DE-      Declination B1950 (sign)
  25- 26  I2    deg      DEd      Declination B1950 (degrees)
  28- 29  I2    arcmin   DEm      Declination B1950 (minutes)
  31- 35  F5.2  arcsec   DEs      Declination B1950 (seconds)
  36- 44  F9.5  arcsec   e_RAs    Mean error of right ascension*cos(delta).
  45- 53  F9.5  arcsec   e_DEs    Mean error of the declination.
  54- 63  F10.2 10mas/yr pmRA     Proper motion in RA (* cos(delta)) (2)
  64- 73  F10.2 10mas/yr pmDE     Proper motion in declination (2)
  74- 80  F7.3  10mas/yr e_pmRA   Mean error of pmRA (2)
  81- 87  F7.3  10mas/yr e_pmDE   Mean error of pmDE (2)
  88- 95  F8.2  yr       EpRA     Mean epoch for the right ascension (3)
  96-103  F8.2  yr       EpDE     Mean epoch for the declination (3)
     105  I1    ---      Model    [0/8] Model flag (4)
     106  A1    ---      ---      [.] Always a dot.
 107-117  F11.5 ---      s0RA     sigma zero of least square solution in RA.
 118-128  F11.5 ---      s0DE     sigma zero of least square solution in Dec.
 129-134  F6.2  mag      mpg      Photographic magnitude from PPM <I/146>
 136-137  A2    ---      Sp       Spectral type from the PPM <I/146>
 139-143  A5    ---      Type     [sm ] Type of adopted solution (5)
 146-147  I2    h        RAhGSC   Right Ascension B1950 in GSC (hours)
 149-150  I2    min      RAmGSC   Right Ascension B1950 in GSC (minutes)
 152-157  F6.3  s        RAsGSC   Right Ascension B1950 in GSC (seconds)
     159  A1    -        DE-GSC   Declination B1950 in GSC (sign)
 160-161  I2    deg      DEdGSC   Declination B1950 in GSC (degrees)
 163-164  I2    arcmin   DEmGSC   Declination B1950 in GSC (minutes)
 166-170  F5.2  arcsec   DEsGSC   Declination B1950 in GSC (seconds)
 171-178  F8.2  yr       EpGSC    Epoch of GSC observation (3)
 179-186  F8.4  arcsec   ErrGSC   Mean error per coordinate in GSC
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Note (1): the AGK3 number (identical to AGK2) is made of
      byte    #2: Zone sign ("+" or "-")
      bytes #3-4: the Zone (degree of declination)
      bytes #5-8: number within zone (zero filled)
Note (2): the proper motions are expressed in arcsec per tropical century.
Note (3): in tropical years.
Note (4): the model flag is 0 when a linear model was used for the
        determination of proper motion; the model flag is 1 to 8
        when the linear model failed the chi-square testing.
Note (5): the symbols used for the model are:
     s: subplate
     m: mask
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(End)                                     Francois Ochsenbein [CDS]  05-Nov-1996