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The Topographies of Rhea and Iapetus in Comparison

Giese, Bernd and Wagner, Roland and Roatsch, Thomas and Denk, Tilmann and Neukum, Gerhard (2007) The Topographies of Rhea and Iapetus in Comparison. AGU Fall Meeting, 2007-12-10 - 2007-12-14, San Francisco, CA (USA).

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Rhea and Iapetus are similar-sized satellites of Saturn but their densities are different. Rhea has a higher rock mass ratio and, associated with it, more radiogenic heating. This implies a thinner lithosphere on Rhea than on Iapetus during their thermal evolution and is expected to have a topographic expression at the surface of these bodies: the thicker the lithosphere the more topography can be supported. We derived the topography of Rhea from Cassini stereo images and compared it with the topography of Iapetus derived earlier (1). We found that large impact basins on Rhea have relief of up to 7 km whereas those on Iapetus reach relief of up to 14 km. This observation is consistent with a thinner lithosphere on Rhea compared to Iapetus during the early period of heavy bombardment. In particular, while Iapetus has retained impact basins with diameters of up to 800 km, the largest basin on Rhea found so far has a diameter of 440 km only. Larger basins, which are expected to have been formed on Rhea too, have obviously been relaxed rapidly or alternatively, could possibly not develop in a thin lithosphere at all. Depth-to-diameter ratios for craters smaller than 100 km on Rhea fit those determined on Iapetus but the basins on Rhea show a higher degree of relaxation than those on Iapetus. (1) B. Giese at al., The topography of Iapetus' leading side, Icarus (2007), doi:10.1016/j.icarus.2007.06.005, in press.

Item URL in elib:https://elib.dlr.de/51268/
Document Type:Conference or Workshop Item (Speech)
Title:The Topographies of Rhea and Iapetus in Comparison
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Denk, TilmannInstitut für Geologische Wissenschaften, Freie Universität BerlinUNSPECIFIED
Neukum, GerhardInstitut für Geologische Wissenschaften, Freie Universität BerlinUNSPECIFIED
Date:December 2007
Refereed publication:No
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Page Range:P12B-07
Series Name:EOS Transactions AGU
Keywords:Rhea, Saturn satellites, Topography, Craters
Event Title:AGU Fall Meeting
Event Location:San Francisco, CA (USA)
Event Type:international Conference
Event Dates:2007-12-10 - 2007-12-14
Organizer:American Geophysical Union
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W EW - Erforschung des Weltraums
DLR - Research area:Space
DLR - Program:W EW - Erforschung des Weltraums
DLR - Research theme (Project):W - Vorhaben CASSINI (old)
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Planetary Geodesy
Deposited By: Giese, Dr.rer.nat. Bernd
Deposited On:14 Jan 2008
Last Modified:27 Apr 2009 14:21

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