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J/A+A/383/296       Saturnian Satellites positions (1996-2000)     (Peng+, 2002)
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Positional measuring procedure and CCD observations for Saturnian satellites.
    Peng Q., Vienne A., Shen K.X.
   <Astron. Astrophys. 383, 296 (2002)>
   =2002A&A...383..296P
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ADC_Keywords: Solar system ; Planets ; Positional data
Keywords: planets and satellites: individual: Saturn -
          techniques: image processing - astrometry

Description:
    199 frames of CCD images of the major satellites of Saturn (Mimas,
    Enceladus, Tethys, Dione, Rhea, Titan, Hyperion and Iapetus), obtained
    on 1-meter telescope at the Yunnan Observatory during the years of
    1996-2000, are measured. These positions are compared to the ones
    computed with the Vienne & Duriez ephemerides (TASS1.7). The
    calibrated parameters of the CCD scale and orientation are determined
    by the comparison of their measurement coordinates with computed
    positions of four bright satellites of Tethy, Dione, Rhea and Titan.

    A catalog of 913 differential positions has been obtained. Analysis of
    the data as inter-satellite positions shows that these observations of
    the above mentioned four satellites have root-mean-square residuals of
    0.04 arcsec in the sense of (O-C) (Observed minus Computed). The
    positional measuring procedure is proved to be good enough to obtain a
    small dispersion in the observations for the major Saturn satellites.

    The format of the present catalog are very near to the one of
    (Strugnell & Taylor, 1990A&AS...83..289S). The coordinates are
    corrected by all astrometric effects. So, these positions are really
    astrometric ones in that meaning that, no astrometric consideration is
    necessary to use them, even if one wants to touch up the calibration.
    Nevertheless, the raw pixels are also given in order to allow anyone
    to reduce again the frames.

File Summary:
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 FileName      Lrecl  Records   Explanations
--------------------------------------------------------------------------------
ReadMe            80        .   This file
table7.dat       123     1311   The catalog
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See also:
   J/A+AS/121/65  : 1990-1994 Saturn's satellites astrometry (Harper+ 1997)
   J/A+AS/136/257 : Saturn's satellites in 1995/97 (Harper+ 1999)
   J/A+AS/139/305 : Position of Saturn's satellites (1982-1988) (Veiga+, 1999)

Byte-by-byte Description of file: table7.dat
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   Bytes Format Units   Label    Explanations
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   1-  3  I3    ---     Opp     *Opposition number
   5-  8  I4    yr      Obs.Y   *The year for observations
  10- 11  I2  "month"   Obs.M   *Month for observations
  13- 22  F10.7 d       Obs.D   *UTC date of observations
  24- 29  F6.3  s       TT-UTC   TT-UTC difference
  31- 33  A3    ---     Obs      [286] Observatory code from Minor Planet Center
  35- 37  A3    ---     Ref      [302] Reference code of the catalog (here 302)
      39  I1    ---     ObsType *[0/1] Observation type
  42- 43  A2    ---     Obj     *Subject satellite, reference satellite
  45- 46  A2    ---     Note    *[0/1] The flag of presence of both coordinates
  49- 60  F12.7 arcsec  ObsRA    The observed coordinates in Right Ascension
  63- 74  F12.7 arcsec  ObsDE    The observed coordinates in Declination
      76  I1    ---     RefSys  *[0/2] The reference system
      78  I1    ---     Frame    [1] The reference frame. Here, 1=geocentric
  80- 86  F7.3  arcsec  O-CRA    ?=999.999 Residuals of observations in
                                   Right Asension
  88- 94  F7.3  arcsec  O-CDE    ?=999.999 Residuals of observations in
                                   Declination
      97  I1    ---     Rsat     Reference satellite when o-c is computed
     100  I1    ---     ---      [0] Index reserved
     103  I1    ---     NSer    *The number of the series
 105-113  F9.3  pix     Xpos    *?=99999.999 Original coordinate in X direction
 115-123  F9.3  pix     Ypos    *?=99999.999 Original coordinate in Y direction
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Note on Opp:
     Oppsition number. 119 for 1996 to 123 for 2000
Note on Obs.Y,  Obs.M,  Obs.D:
     The date is not light time corrected for the UTC
Note on ObsType:
     0 = alpha, delta
     1 = Delta(alpha)cos(delta), Delta(delta)
Note on Obj:
     0 for Saturn, 1 to 8 for S1 to S8
     * when there is no reference satellite that is for observation
        type 0, C for the center of the plate which is not a physical object
Note on Note:
     0 = observation absent
     1 = observation present
Note on RefSys:
     0 = mean equator and equinox B1950
     1 = true equator and equinox of date of observation
     2 = mean equator and equinox J2000
Note on NSer:
     1,2,3 and 4 is for 1996, 1997, 1999 and 2000 series respectively. The scale
      and orientation are the same for all the observations of one series
Note on Xpos, Ypos:
     Difference in raw pixel coordinate between subject satellite and reference
      satellite in X- anf Y-direction
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Acknowledgements: Peng Qingyu <pengqy@public.guangzhou.gd.cn>
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(End)      Peng Qingyu [Univ. Jinan], Patricia Bauer [CDS]           27-Sep-2001