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

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

Sep 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998dda....30.0203m&link_type=abstract

American Astronomical Society, DDA meeting #30, #02.03; Bulletin of the American Astronomical Society, Vol. 30, p.1140

Astronomy and Astrophysics

Astronomy

Scientific paper

HST observations of Saturn's ring--plane crossings in May, August and November 1995 revealed the presence of multiple objects orbiting in or near the F ring (Nicholson et\ al.; Bosh and Rivkin 1996, Science 272, 509; 518). The combination of the May and August data sets, along with refined ring template subtraction, has allowed us to improve our understanding of the distribution of these suspected F ring clumps. In addition to new orbits for objects S/1995 S5, S6 and S7, we have obtained measurements and orbital parameters for S9, first reported in data taken at the CFHT (Roddier et\ al. 1995, IAUC 6515), and measurements of a host of fainter objects in both HST data sets. An additional 3 F--ring objects in May and 5 in August were found to account for a total of ~ 90 of these fainter clump measurements. S/1995 S1 orbits very close to Atlas, well inside the F ring; S7 and S9 appear to be coorbital with Prometheus; while S3 and S6 fall ~ 500 km on either side of the F ring. These results lend support to Cuzzi and Burns' (1988, Icarus 74, 284) hypothesis of a belt of moonlet--sized (or smaller) objects occupying the entire radial region between Pandora and Prometheus. Object & Semimajor axis (km) & e & RMS residual (km) S/1995 S1 & 137,529+/-87 & 0 & 528.43 Atlas & 137,678 &0 & S/1995 S7 & 139,371+/-93 &0 & 250.64 Prometheus& 139,377.2+/-0.1 & 0.0024 & 214.91 S7+May 358 & 139,382.4+/-0.3 & 0.0024 & 389.67 S/1995 S9 & 139,445+/-139 & 0 & 362.95 S/1995 S6 & 139,594+/-75 & 0 & 350.67 S/1995 S5 & 139,824+/-88 & 0.0029 & 329.44 F ring & 140,209 & 0.0029 & S/1995 S3 & 140,742+/-135 & 0 & 570.33 Pandora & 141,714.8+/-0.2 & 0.0044 & 314.06

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