The Orbit of Prometheus at the Voyager Epochs

Details The Orbit of Prometheus at the Voyager Epochs The Orbit of Prometheus at the Voyager Epochs

Sep 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999dps....31.4402e&link_type=abstract

American Astronomical Society, DPS meeting #31, #44.02

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Scientific paper

Following the 1995 Saturn ring plane crossing it was found that the satellite Prometheus was lagging behind its predicted orbital longitude by ~ 19 degrees (Nicholson et. al. (1995). Science 272, 509--515. and Bosh & Rivkin (1996). Science 272, 518--521). This lag seemed to remain constant throughout the ~ 180 days of the 1995 RPX however HST observations from the 1996, 1997 and 1998 oppositions show that the lag is increasing by approximately 0.6 deg/year (French et. al. (1998). B.A.A.S. 30, 1141). The baseline mean motion against which all these observations are compared, the Voyager epoch value of 587.2890 +/-0.0005 deg/day, was obtained using combined Voyager 1 and 2 data (Synnott et. al. (1983). Icarus 53, 156--158). Given a possible connection between Prometheus' behavior and some features in the F ring, we present the results of a re-analysis of the Voyager data to obtain the mean motion and other orbital elements of Prometheus at the Voyager 1 and 2 epochs separately.

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