Jul 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996hst..prop.6806f&link_type=abstract
HST Proposal ID #6806
Other
Hst Proposal Id #6806 Solar System
Scientific paper
Saturn's rings are a unique dynamical laboratory and, more than a decade after Voyager, continue to present challenging problems which require additional data to attack. Making use of the capabilities of HST, and the changing geometry of the rings as seen from Earth orbit over the next seven years, we propose to address important outstanding problems such as the composition of the ring material {which is known to be radially variable on spatial scales down to hundreds of km}, the ``filling factor" of the rings {which is a key constraint on their dynamical behavior}, continuing controversy over the cause of the ``opposition brightening", transient gravitational instabilities {from their photometric signatures}, azimuthal asymmetries in ring brightness, and the temporal variability of ``spokes" and other dynamically interesting regions. We propose to obtain a coherent set of images of the Saturnian ring system over the course of 1/4 Saturn year {7 Earth years} using filters UBVRI and methane with the PC chip of WFPC2. The rings will be imaged four times per year {at 0,0.6,2, and 6 degrees phase} using this filter set; exposures with two other filters designed to measure composition will augment our standard set as time allows. We will attempt to image the G ring with the PC in the V filter when the ring is at its lowest tilt angle.
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