Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011dda....42.0805s&link_type=abstract
American Astronomical Society, DDA meeting #42, #8.05; Bulletin of the American Astronomical Society, Vol. 43, 2011
Astronomy and Astrophysics
Astronomy
Scientific paper
Saturn's Huygens ringlet, located 250 km exterior to the outer edge of Saturn's B ring, has for some time been known to be eccentric; Porco (1983) measured a radial amplitude of 30 km using Voyager data sets, and based on the relatively large residuals in the simple Keplerian ellipse model, hypothesized that an additional wavenumber-2 pattern may be present as a response to the nearby Mimas 2:1 inner Lindblad resonance and/or the large-amplitude distortion in the massive B-ring edge, which at that time was assumed to be produced by the resonance. An attempt to fit such a pattern using 13 Voyager measurements (11 ISS images, one RSS occultation, and one UVS occultation) did not produce a statistically significant result. Using Cassini ISS imaging data, we show that the ringlet is indeed influenced by the Mimas resonance, and that there is an additional contribution from a free wavenumber-2 mode in the ringlet. The amplitudes of these modes, about 1 km each, are far too small to have been detected by Voyager.
Porco Carolyn C.
Spitale Joseph N.
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