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PDS_VERSION_ID        = PDS3                                                   RECORD_TYPE           = STREAM                                                 OBJECT                = TEXT                                                     PUBLICATION_DATE      =  " "                                                   NOTE                        = "Experiment description for the                                                 Jovian System Ephemeris Improvement                                            Experiment (Delta DOR's) conducted                                             starting in 1996 through 1997 (DOY 199                                         through DOY 344).  Formatted for display                                       or printing with up to 78 constantwidth                                        characters per line."                         END_OBJECT            = TEXT                                                   END                                                                                                                                                                                                                                               Jovian System Ephemeris Improvement Experiment                                                                                                                The experiment objective is to improve knowledge of the ephemeris of      Jupiter.  Measurements of the Galileo spacecraft angular position, in          Jupiter orbit, were made at 24 distinct epochs between July 17, 1996 and       December 10, 1997.  Jupiter's position is tied to the spacecraft position      through the navigation process, so these data provide a measurement of the     Jupiter angular position.  The measurement technique, known in the Deep        Space Network as Delta Differential One-way Range (Delta DOR), determines      the angular position offset between the spacecraft and an angularly nearby     quasar using differential radio interferometry.  Delta DOR measurements        made on two intercontinental baselines on the DSN, spanning a fraction of      the Jupiter orbital period, are combined with existing data to solve for an    improved Jupiter ephemeris in the radio reference frame.