Other
Scientific paper
Dec 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997hst..prop.7178s&link_type=abstract
HST Proposal ID #7178
Other
Hst Proposal Id #7178 Solar System
Scientific paper
Groundbased spectroscopy established a quarter of a century ago that there must be substances other than water ice in Saturn's bright rings, as indicated by their UV reflectivity, which does not match that of pure ice. Speculation has ranged from silicate to carbonaceous material, but there remains no near-infrared evidence for anything but water ice. High resolution images obtained by the Voyager spacecraft show distinct color differences among narrow ringlets within Saturn's B ring, suggesting heterogeneous composition within the ring. The Voyager images also revealed that Saturn's C ring has a color that is distinctly different from the average A and B ring colors. High resolution NICMOS images may reveal non-water-ice material within narrow regions of the B ring and characterize the near-infrared differences between the B and A rings and the C ring. Observations of the rings are made at both ansae in filters that are both within and outside the 2-micron water-ice absorption band. Additional filters are used to investigate the spectral properties of the ringlets at still longer wavelengths.
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