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J/AJ/136/2214  Positions of Saturn and its satellites in 2002-2006 (Peng+, 2008)
CCD positions of Saturn and its major satellites from 2002-2006.
    Peng Q.Y., Vienne A., Wu X.P., Gan L.L., Desmars J.
   <Astron. J., 136, 2214-2221 (2008)>
   =2008AJ....136.2214P
ADC_Keywords: Planets ; Positional data

Keywords: astrometry - planets and satellites: general -
          techniques: image processing

Abstract:
    This paper presents 2154 precise positions of Saturn and its major
    satellites from 359 CCD exposures taken with the 1m telescope at the
    Yunnan Observatory during the years 2002-2006.

Description:
    During the period of 2002-2006, more than 1000 CCD exposures for
    Saturn and its major satellites were made with the 1m telescope at the
    Yunnan Observatory (geographical longitude: E102°47.3', latitude:
    N25°1.5', and altitude: 2000m). The Johnson I-type filter was used
    while observing.

File Summary:

       FileName      Lrecl  Records   Explanations

ReadMe            80        .   This file
table2.dat        59       14   Distributions and solved parameters of our
                             observations
table4.dat       106     2872   The observations at Yunnan Observatory


See also:
    J/A+AS/121/65  : 1990-1994 Saturn's satellites astrometry (Harper+ 1997)
    J/A+AS/139/305 : Position of Saturn's satellites (1982-1988) (Veiga+, 1999)
    J/A+A/422/377  : 1997-2000 Saturn's satellites astrometry (Qiao+, 2004)


Byte-by-byte Description of file: table2.dat

   Bytes Format Units       Label    Explanations

   1-  6  I6    ---         Set      Data set
       7  A1    ---         m_Set    [ab] Multiplicty index on Set
   9- 18  A10  "YYYY/MM/DD" ObsDate  Observation date
  20- 21  I2    ---         N        Number of exposures corresponding to
                                      the data set
  23- 25  I3    min         Per      Period of time for each data set during
                                      observing
  27- 33  F7.5  arcsec/pix  Scale1   Scale factor (solved parameter)
  35- 41  F7.5  arcsec/pix  Scale2   Scale factor (solved parameter)
  43- 50  F8.3  deg         Ori1     Orientation (solved parameter)
  52- 59  F8.3  deg         Ori2     Orientation (solved parameter)


Byte-by-byte Description of file: table4.dat

   Bytes Format Units    Label    Explanations

   1-  6  I6    ---      Set      Set identification from Table 2
       7  A1    ---      m_Set    [ab] Multiplicty index on Set
   9- 11  I3    ---      ID       Exposure identification
  13- 30  A18   "datime" ObsDate  Date of Observation, in
                                  YYYY/MM/DD.ddddddd units (1)
  32- 34  I3    ---      Obs      [286] IAU observatory code (2)
      36  I1    ---      t        [0/1] Observation type (3)
  38- 39  A2    ---      Obj      Subject satellite and reference satellite (4)
  41- 48  F8.3  arcsec   Obs1     First coordinate (5)
  50- 57  F8.3  arcsec   Obs2     Second coordinate (5)
  59- 62  F4.2  arcsec   e_Obs1   Estimated error in obs1 (6)
  64- 67  F4.2  arcsec   e_Obs2   Estimated error in obs2 (6)
      69  I1    ---      s        [1] Reference system (7)
      71  I1    ---      f        [0/1] Reference frame (8)
  73- 78  F6.3  ---      O-C1     ?=99.999 Residual of first observation (9)
  80- 85  F6.3  ---      O-C2     ?=99.999 Residual of second observation (9)
      87  I1    ---      r        [0] Number of satellite or Saturn use as
                                   reference in the computation of (O-C) (10)
  89- 90  I2    ---      se       [1/14] Number of series (11)
  92- 98  F7.2  pix      Xpix     ?=9999.99 Original X coordinate (12)
 100-106  F7.2  pix      Ypix     ?=9999.99 Original Y coordinate (12)

Note (1): UTC and not light-time corrected.

Note (2): From the Minor Planet Center.

Note (3): Observation type as follows:
      0 = α,δ
      1 = Δαcos(δ),Δδ
Note (4): Subject satellite and reference satellite as follows:
      0 = Saturn
    1-6 = S1-S6
      C = center of the frame that is not a physical object
Note (5): Note that obs1 and obs2 for obj = C* mean the positions (unit: degree)
     in the celestial coordinate system for the center point of a CCD frame.
Note (6): Errors from both pixel positions and calibration parameters are
     taken into account. In the lines of Obj = C* and C0, e_obs1 and e_obs2
     are all designed 0.00.
Note (7): Reference system:
      1 = true equator and equinox of date of observation.
Note (8): Reference frame as follows:
      1 = Geocentric
      0 = Topocentric
Note (9): In arcsec when JPL ephemeris is referred.  When obj = C* the
     center's O-C1 and O-C2 are designed 99.999 in two directions, and
     9999.99 for its two pixel coordinates. When Obj = C0 the O-C1 and O-C2
     is designed 0.000 in two directions.
Note (10): 0 = Saturn.

Note (11): For the scale factor and orientation corresponding to each
     series, look in Table 2.
Note (12): In the sense of xs - xr and ys - yr.



History:
    From electronic version of the journal
(End)                  Greg Schwarz [AAS], Patricia Vannier [CDS]    20-May-2011