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J/A+AS/115/97       Positions of 790 AGNs   (Veron-Cetty+, 1996)
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Astrometry with the Digitized Sky Survey. Positions of 790 AGNs
       Veron-Cetty M.-P., Veron P.
      <Astron. Astrophys. Suppl. Ser. 115, 97 (1996)>
      =1996A&AS..115...97V      (SIMBAD/NED BibCode)
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ADC_Keywords: Active gal. nuclei ; QSOs
Keywords: astrometry - galaxies: active - quasars

Description:
    From the measurement on the Digitized Sky Survey of the optical
    position of 153 QSOs with an accurate VLBI position, we have
    determined that the r.m.s. uncertainties of these measurements is
    about 0.6 arcsec in both coordinates over the whole sky, except for
    objects located near the edge of the plates.
    We have measured the optical position of 790 AGNs (or AGNs
    candidates). For many of these objects, the accuracy of the published
    optical position was one arcminute or worst.

File Summary:
-------------------------------------------------------------------------------
 FileName    Lrecl    Records    Explanations
-------------------------------------------------------------------------------
ReadMe          80          .    This file
table1.dat      68        159    Optical J2000 position for 153 QSOs with
                                   absolute VLBI position.
table2.dat     104        791    Optical position for 790 AGNs (and AGN
                                    candidates)
refs.dat        80        187    References for table2
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Byte-by-byte Description of file: table1.dat
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   Bytes Format  Units   Label    Explanations
--------------------------------------------------------------------------------
   2- 17  A16    ---     Name     Name of the source
  18- 19  I2     h       RAh      Right Ascension J2000 (hours) (optical)
  21- 22  I2     min     RAm      Right Ascension J2000 (minutes)
  24- 28  F5.2   s       RAs      Right Ascension J2000 (seconds)
      30  A1     ---     DE-      Declination J2000 (sign)
  31- 32  I2     deg     DEd      Declination J2000 (degrees)
  34- 35  I2     arcmin  DEm      Declination J2000 (minutes)
  37- 40  F4.1   arcsec  DEs      Declination J2000 (seconds)
  45- 48  F4.1   arcsec  dRA      optical - radio right ascension
  51- 54  F4.1   arcsec  dDE      optical - radio declination
  57- 61  F5.1   cm      Xpos     Rectangular coordinate  toward East
                                    measured from the centre of the plate
  64- 68  F5.1   cm      Ypos     Rectangular coordinate  toward North
                                    measured from the centre of the plate
--------------------------------------------------------------------------------

Byte-by-byte Description of file: table2.dat
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   Bytes Format  Units   Label    Explanations
--------------------------------------------------------------------------------
   2- 17  A16    ---     Name     Name of the source
  18- 19  I2     h       RA1950h  Right Ascension B1950 (hours)
  21- 22  I2     min     RA1950m  Right Ascension B1950 (minutes)
  24- 28  F5.2   s       RA1950s  Right Ascension B1950 (seconds)
      30  A1     ---     DE1950-  Declination B1950 (sign)
  31- 32  I2     deg     DE1950d  Declination B1950 (degrees)
  34- 35  I2     arcmin  DE1950m  Declination B1950 (minutes)
  37- 40  F4.1   arcsec  DE1950s  Declination B1950 (seconds)
  43- 44  I2     h       RAh      Right Ascension J2000 (hours)
  46- 47  I2     min     RAm      Right Ascension J2000 (minutes)
  49- 53  F5.2   s       RAs      Right Ascension J2000 (seconds)
      56  A1     ---     DE-      Declination J2000 (sign)
  57- 58  I2     deg     DEd      Declination J2000 (degrees)
  60- 61  I2     arcmin  DEm      Declination J2000 (minutes)
  63- 66  F4.1   arcsec  DEs      Declination J2000 (seconds)
  69- 73  F5.1   cm      Xpos     Rectangular coordinate  toward East
                                    measured from the centre of the plate
  75- 79  F5.1   cm      Ypos     Rectangular coordinate  toward North
                                    measured from the centre of the plate
  82- 84  I3     ---     FC       [1/174]? Reference for the finding chart
                                    (see file "refs")
  86- 90  A5     ---     Note     [()1-8C*, ] Remarks (1)
--------------------------------------------------------------------------------
Note (1):
    C  indicates that the position has been measured with the cursor rather
       than with a Gaussian fitting routine.
    *  indicates that the object is located near the edge of the plate
       ( |X| or |Y| > 14.7 cm )
    1  double sep. 3"
    2  weak object at 5.0" N
    3  extended
    4  double sep. 4"
    5  double object
    6  weak object at 3.8"
    7  object at 6.0" N
    8  weak object at 3.5" NW
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Byte-by-byte Description of file: refs.dat
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   Bytes Format  Units   Label    Explanations
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   1-  3  I3     ---     FC       [1/174]?+ Reference as in table2,
                                    blank for continuation
   5- 80  A76    ---     Text     Text of reference
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Courtesy: Mira Veron <mira@obshpx.obs-hp.fr>
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(End)                                    Francois Ochsenbein [CDS]   13-Jul-1995