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J/A+A/312/1031      Positions & proper motions of radio stars    (Argyle+, 1996)
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Comparison of the Carlsberg optical references frame with the International
celestial reference frame
      Argyle R.W., Einicke O.H., Pilkington J.D.H., Morrison L.V.,
      Fabricius C., Helmer L.
     <Astron. Astrophys. 312, 1031 (1996)>
     =1996A&A...312.1031A      (SIMBAD/NED BibCode)
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ADC_Keywords: Nebulae ; Positional data
Keywords: astrometry - references frames

Description:
    The optical positions of 63 extragalactic nebulae measured in the
    frame defined by the annual series of Carlsberg Meridian Catalogues
    Nos 1-8 are compared with their VLBI radio positions in the
    International Celestial Reference Frame. The differences between these
    radio and optical positions are interpreted as showing the global
    distortion of the Carlsberg optical frame, which is linked to that
    of the FK5. North of the equator the Carlsberg optical frame is within
    0.05" of the ICRF; but south of the equator it deviates by 0.07" in
    right ascension and 0.10" in declination. The general form of the
    deviations follow those of the FK5, which are revealed in a recent
    comparison of FK5 with a preliminary version of the Hipparcos
    catalogue (H30).

File Summary:
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  FileName      Lrecl  Records   Explanations
--------------------------------------------------------------------------------
ReadMe             80        .   This file
table2             75       63   Carlsberg optical positions of ICRF sources
                                  and differences, radio minus optical
table3             80       26   Carlsberg optical positions and proper motions
                                  of radio stars
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See also:
    I/213 : CMC8 (8th Carlsberg Meridian Catalog, 1994)
    I/205 : CMC7 (7th Carlsberg Meridian Catalogue, 1993)
    I/189 : CMC6 (6th Carlsberg Meridian Catalogue, 1992)
    I/170 : CMC5 (5th Carlsberg Meridian Catalogue, 1991)
    I/147 : CMC4 (4th Carlsberg Meridian Catalogue, 1989)

Byte-by-byte Description of file: table2
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   Bytes Format Units   Label     Explanations
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   1- 20  A20   ---     Name      Name of radio source (IAU nomenclature)
  24- 25  I2    h       RAh       Right ascension (2000)
  27- 28  I2    min     RAm       Right ascension (2000)
  30- 35  F6.3  s       RAs       Right ascension (2000)
      39  A1    ---     DE-       Declination sign
  40- 41  I2    deg     DEd       Declination (2000)
  43- 44  I2    arcmin  DEm       Declination (2000)
  46- 50  F5.2  arcsec  DEs       Declination (2000)
      55  I1    ---     Nplate    ? Number of plates
  59- 63  F5.2  arcsec  DRA       Delta RA (radio-optical)
  66- 70  F5.2  arcsec  DDE       Delta DE (radio-optical)
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Byte-by-byte Description of file: table3
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   Bytes Format Units     Label     Explanations
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   1- 11  A11   ---       Name      Name of radio star
  12- 13  I2    h         RAh       Right ascension (2000)
  15- 16  I2    min       RAm       Right ascension (2000)
  18- 23  F6.3  s         RAs       Right ascension (2000)
  26- 32  F7.4  s/yr      pmRA      Proper motion in right ascension
  35- 39  F5.2  yr        EpRA-1900 Epoch of RA (1900+)
      42  A1    ---       DE-       Declination sign
  43- 44  I2    deg       DEd       Declination (2000)
  46- 47  I2    arcmin    DEm       Declination (2000)
  49- 53  F5.2  arcsec    DEs       Declination (2000)
  56- 61  F6.3  arcsec/yr pmDE      Proper motion in declination
  64- 68  F5.2  yr        EpDE-1900 Epoch of DE (1900+)
  70- 74  F5.2  arcsec    DRA       Delta RA(radio-optical)
  76- 80  F5.2  arcsec    DDE       Delta Dec(radio-optical)
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Courtesy:  R.W. Argyle, <merlp@ast.cam.ac.uk>
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(End)                                         Patricia Bauer [CDS]   11-Mar-1996