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File: 1997-1999_J6-8_nsdc.data.txt
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     Contents: 
       - 14 observations of absolute positions of the satellites of
     Jupiter made on 3 oppositions from December 1997 to September 1999.
     (right ascensions and declinations coordinates in mean equatorial 
     topocentric 2000.0 reference frame).

     J-6: 1 observation made on 1997 December 11
     J-7: 8 observations made from 1997 Dec. 11 to 1999 Sept. 3
     J-8: 5 observations made from 1997 Dec. 11 to 1998 Sept. 30
 
     Reference: 
     These observations have been made and sent to NSDC by Bill Owen
     wmo@wansor.jpl.nasa.gov
     code observatoire: 673
     W. M. Owen Jr., Jet Propulsion Laboratory 301-150, Pasadena CA 91109-8099
     telescope:  0.61-m f/16 reflector + CCD
 
 
     Format:
         This is a sequential file; one record contains 80 bytes with the 
         MPC format,
         col.  1-12    the satellite number or designation,
         col. 16-19    the year,               
         col. 21-22    the month, 
         col. 24-31    the day and fraction of day,
 
         col. 33-34    hours                  |
         col. 36-37    minutes                  > right ascension 
         col. 39-43    seconds                |
         col. 45-47    degrees          |
         col. 49-50    minuts            >       declination
         col. 52-55    seconds          |
 
         col. 66-69    magnitude if available
         col. 71       spectral band for the magnitude if available
         col. 78-80    observatory IAU number

     Information:

These are reduced positions from CCD observations of three of the outer Jovian
satellites, taken on three nights in the past three years.  (Our observing
time is limited, and these satellites seem to avoid areas of the sky with
good reference stars.)  The detector is a 4K x 4K CCD, 15 um/pixel, with
1 pixel subtending 0.32 arcsec and the entire field of view about 22 arcmin.
The observations were reduced to the ACT catalog using Eichhorn's overlapping
plate method.  They are reported below in the format used by the MPC.
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