Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006sf2a.conf..433t&link_type=abstract
SF2A-2006: Proceedings of the Annual meeting of the French Society of Astronomy and Astrophysics Eds.: D. Barret, F. Casoli, G.
Astronomy and Astrophysics
Astrophysics
Scientific paper
The Cassini-Huygens mission around Saturn has provided a lot of data that show that Saturn's icy moons are active worlds. We know that Titan's surface is not covered by hydrocarbon oceans and that the origin of methane must be related to internal processes. Titan's surface displays a large variety of geological features including dunes, impact craters, dry rivers, shorelines and cryovolcanoes. The data from both the Huygens probe and the remote sensing instruments provide information about the surface composition that is not yet fully determined. Mid-sized satellites are also active. Enceladus presents a rich atmosphere and geysers that ejects icy particles in Saturn's ring E. We will expose in the present paper the different models that can explain such an activity on such a small satellite. Iapetus' shape is also very intriguing because it suggests that it froze its shape at a rotation rate of 17 hours whereas the present time spin rate is on the order 80 days.
Le Mouélic Stéphane
Rodriguez Sebastien
Sotin Ch.
Tobie Gabriel
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