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The Saturnian satellite Rhea as seen by Cassini VIMS

Stephan, K and Jaumann, R and Wagner, R and Clark, R and Cruikshank, D P and Giese, B and Hibbitts, C.A. and Roatsch, T and Matz, K-D and Brown, R. H. and Filacchione, G. and Cappacioni, F. and Scholten, F and Buratti, B.J. and Hansen, G.B. and Nicholson, P. D. and Baines, K and Nelson, R.M. and Matson, D. L. (2011) The Saturnian satellite Rhea as seen by Cassini VIMS. Planetary and Space Science, 61 (1), pp. 142-160. Elsevier. doi: 10.1016/j.pss.2011.07.019.

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Since the arrival of the Cassini spacecraft at Saturn in June 2004, the Visual and Infrared Mapping Spectrometer has obtained new spectral data of the icy satellites of Saturn in the spectral range from 0.35 to 5.2 μm. Numerous flybys were performed at Saturn’s second largest satellite Rhea, providing a nearly complete coverage with pixel-ground resolutions sufficient to analyze variations of spectral properties across Rhea’s surface in detail. We present an overview of the VIMS observations obtained so far, as well as the analysis of the spectral properties identified in the VIMS spectra and their variations across its surface compared with spatially highly resolved Cassini ISS images and digital elevation models. Spectral variations measured across Rhea’s surface are similar to the variations observed in the VIMS observations of its neighbor Dione, implying similar processes causing or at least inducing their occurrence. Thus, magnetospheric particles and dust impacting onto the trailing hemisphere appear to be responsible for the concentration of dark rocky/organic material and minor amounts of CO2 in the cratered terrain on the trailing hemisphere. Despite the prominent spectral signatures of Rhea’s fresh impact crater Inktomi, radiation effects were identified that also affect the H2O ice-rich cratered terrain of the leading hemisphere. The concentration of H2O ice in the vicinity of steep tectonic scarps near 270°W and geologically fresh impact craters implies that Rhea exhibits an icy crust at least in the upper few kilometers. Despite the evidence for past tectonic events, no indications of recent endogenically powered processes could be identified in the Cassini data.

Item URL in elib:https://elib.dlr.de/72695/
Document Type:Article
Title:The Saturnian satellite Rhea as seen by Cassini VIMS
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Stephan, Kkatrin.stephan (at) dlr.deUNSPECIFIED
Jaumann, Rralf.jaumann (at) dlr.deUNSPECIFIED
Wagner, Rroland.wagner (at) dlr.deUNSPECIFIED
Clark, RU.S. Geological Survey, Denver Federal Center, Denver CO 80225, USA Pasadena CA 91109, USAUNSPECIFIED
Cruikshank, D PNASA Ames Research Center, MS 245-3 Moffett Field, CA 94035-1000, USAUNSPECIFIED
Giese, Bbernd.giese (at) dlr.deUNSPECIFIED
Hibbitts, C.A.JHU Applied Physics Laboratory, Laurel, Md., USAUNSPECIFIED
Roatsch, Tthomas.roatsch (at) dlr.deUNSPECIFIED
Matz, K-Dklaus-dieter.matz (at) dlr.deUNSPECIFIED
Brown, R. H.Lunar and Planetary Lab, University of Arizona, Tucson, AZ, USAUNSPECIFIED
Filacchione, G.INAF-IASF, Rome, ItalyUNSPECIFIED
Scholten, Ffrank.scholten (at) dlr.deUNSPECIFIED
Buratti, B.J.Jet Propulsion Laboratory, Pasadena, CAUNSPECIFIED
Hansen, G.B.Planet.Sci. Inst., NW Div., Dept. of Earth & Space Sci., Univ. of Washington, Seattle, WashingtonUNSPECIFIED
Nicholson, P. D.Department of Astronomy, Cornell University, Ithaca, NY, USAUNSPECIFIED
Baines, KSSEC, University of Wisconsin—Madison, Madison, WI 53706, USAUNSPECIFIED
Nelson, R.M.Jet Propulsion Laboratory, Pasadena, CAUNSPECIFIED
Matson, D. L.Jet Propulsion Laboratory, Pasadena, CA, USAUNSPECIFIED
Journal or Publication Title:Planetary and Space Science
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
DOI :10.1016/j.pss.2011.07.019
Page Range:pp. 142-160
Keywords:Saturn icy satellites, Rhea, geology, spectroscopy
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Exploration
DLR - Research area:Raumfahrt
DLR - Program:R EW - Space Exploration
DLR - Research theme (Project):R - Vorhaben CASSINI (old)
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Planetary Geology
Deposited By: Stephan, Dr.rer.nat. Katrin
Deposited On:06 Feb 2012 09:53
Last Modified:20 Mar 2013 19:45

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