Hubble Space Telescope (HST) observations of Saturn's inner satellites during the 1995 ring--plane crossings

Details Hubble Space Telescope (HST) observations of Saturn's inner satellites during the 1995 ring--plane crossings Hubble Space Telescope (HST) observations of Saturn's inner satellites during the 1995 ring--plane crossings

Sep 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998baas...30.1045m&link_type=abstract

American Astronomical Society, DPS meeting #30, #17.P10; Bulletin of the American Astronomical Society, Vol. 30, p.1045

Astronomy and Astrophysics

Astrophysics

Scientific paper

Saturn's ring--plane crossings in May, August and November 1995 presented an opportunity to study the faint inner satellites of Saturn, usually overpowered by the glare of Saturn's normally bright rings. Orbit fits for these satellites have been published for each separate HST data set, (Nicholson et\ al.; Bosh and Rivkin 1996, Science 272, 509; 518), but the combination of the three data sets, along with refined ring template subtraction, has allowed us to obtain greatly improved fits (see below). Values of lambda_obs -lambda_pred for Janus and Epimetheus are given relative to the ephemeris of Nicholson et al. 1992 (Icarus 100; 464); those for Pandora and Prometheus are compared with the 1995 model of Jacobson (BAAS 27; 1202), while Mimas is relative to the ephemeris of Harper and Taylor 1993 (Astron. Astrophys. 168; 326). The Janus, Epimetheus and Pandora fits are within 0.4deg of Jacobson's 1996 (BAAS 28; 1185) fit to all available satellite data. Prometheus' lag of ~ 18.8deg behind its predicted position seems to remain constant throughout the ~ 180 days of the 1995 RPX observing period, but subsequent HST observations have shown that this lag is increasing with time (French et al. 1998, DDA meeting). In addition to new orbits for the objects S/1995 S5, S6 and S7 (Nicholson et al. 1995 IAUC 6243), we have obtained measurements and orbital parameters for S9, first reported in data taken at the CFHT (Roddier et\ al. 1995, IAUC 6515). S7 and S9 appear to be coorbital with Prometheus; while S5 and S6 fall ~ 500--600 km interior to the F ring.
Object & Mean motion (deg /day) & e & RMS (km) & Delta lambda
Prometheus& 587.2902+/-0.0018 & 0.0024 & 281 & -18.85 Pandora & 572.7780+/-0.0024 & 0.0044 & 228 & -0.23 Epimetheus & 518.4822+/-0.0020 & 0.0126 & 260 & 1.07 Janus & 518.2383+/-0.0006 & 0.0066 & 132 & 0.08 Mimas & 381.9894+/-0.0009 & 0.0201 & 272 & -0.25

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