Cassini's geological and compositional view of Tethys

Katrin Stephan, Roland Wagner, Ralf Jaumann, Roger N. Clark, Dale P. Cruikshank, Robert H. Brown, Bernd Giese, Thomas Roatsch, Gianrico Filacchione, Dennis Matson, Cristina Dalle Ore, Fabrizio Capaccioni, Kevin H. Baines, Sebastien Rodriguez, Norbert Krupp, Bonnie J. Buratti, Phil D. Nicholson

Research output: Contribution to journalArticle

5 Scopus citations

Abstract

The Saturnian satellite Tethys exhibits geological and spectral properties, whose appearance, nature and spatial distribution partly mirror those identified on the neighboring satellites Dione and Rhea or fit to the picture how spectral surface properties are expected to change from one satellite to the other within the inner Saturnian system. However, we also identified spectral variations that are unique in the Saturnian system. Whereas geologically young surface features are characterized by pure H2O-ice composition with relatively large particles, which match the particle sizes measured for fresh surface features also on Dione and Rhea, geologically old weathered regions are dominated by submicron-sized ice particles. Our investigations confirm that the Odysseus impact event did not cause the formation of Tethys' extended graben system Ithaca Chasma. On the contrary, Odysseus might be responsible for the N-S trending 'icy' bands that mark Tethys' surface in the center of its leading and trailing hemisphere.

Original languageEnglish (US)
Pages (from-to)1-22
Number of pages22
JournalIcarus
Volume274
DOIs
StatePublished - Aug 1 2016

Keywords

  • Geological processes
  • Ices
  • IR spectroscopy
  • Satellites surfaces
  • Saturn

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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    Stephan, K., Wagner, R., Jaumann, R., Clark, R. N., Cruikshank, D. P., Brown, R. H., Giese, B., Roatsch, T., Filacchione, G., Matson, D., Ore, C. D., Capaccioni, F., Baines, K. H., Rodriguez, S., Krupp, N., Buratti, B. J., & Nicholson, P. D. (2016). Cassini's geological and compositional view of Tethys. Icarus, 274, 1-22. https://doi.org/10.1016/j.icarus.2016.03.002