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- Title
Surface composition of Hyperion.
- Authors
Cruikshank, D. P.; Dalton, J. B.; Ore, C. M. Dalle; Bauer, J.; Stephan, K.; Filacchione, G.; Hendrix, A. R.; Hansen, C. J.; Coradini, A.; Cerroni, P.; Tosi, F.; Capaccioni, F.; Jaumann, R.; Buratti, B. J.; Clark, R. N.; Brown, R. H.; Nelson, R. M.; McCord, T. B.; Baines, K. H.; Nicholson, P. D.
- Abstract
Hyperion, Saturn’s eighth largest icy satellite, is a body of irregular shape in a state of chaotic rotation. The surface is segregated into two distinct units. A spatially dominant high-albedo unit having the strong signature of H2O ice contrasts with a unit that is about a factor of four lower in albedo and is found mostly in the bottoms of cup-like craters. Here we report observations of Hyperion’s surface in the ultraviolet and near-infrared spectral regions with two optical remote sensing instruments on the Cassini spacecraft at closest approach during a fly-by on 25–26 September 2005. The close fly-by afforded us the opportunity to obtain separate reflectance spectra of the high- and low-albedo surface components. The low-albedo material has spectral similarities and compositional signatures that link it with the surface of Phoebe and a hemisphere-wide superficial coating on Iapetus.
- Subjects
ALBEDO; SURFACE of the earth -- Optical properties; AEROSPACE telemetry; REMOTE sensing; SPACE vehicles; SPECTRUM analysis
- Publication
Nature, 2007, Vol 448, Issue 7149, p54
- ISSN
0028-0836
- Publication type
Article
- DOI
10.1038/nature05948