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Dione’s spectral and geological properties |
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| Authors: | Katrin Stephan Ralf Jaumann Roland Wagner Dale P Cruikshank Thomas Roatsch Robert H Brown Bonnie J Buratti Tom B McCord Kevin H Baines |
| Institution: | a DLR, Institute of Planetary Research, Rutherfordstrasse 2, 12489 Berlin, Germany b Freie Universität, FR Planetologie und Fernerkundung, Malteserstr. 74-100, 12249 Berlin, Germany c US Geological Survey, Denver Federal Center, Denver CO 80225, USA d NASA Ames Research Center, MS 245-3 Moffett Field, CA 94035-1000, USA e JHU Applied Physics Laboratory, Laurel, MD, USA f Lunar and Planetary Laboratory, University of Arizona, Tucson, AZ 85721, USA g INAF-IASF, via del Fosso del Cavaliere 100, Rome, Italy h Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109, USA i University of Washington, Seattle, USA j Space Science Institute, Winthrop, WA, USA k Cornell University, Astronomy Department, Ithaca, NY, USA |
| Abstract: | We present a detailed analysis of the variations in spectral properties across the surface of Saturn’s satellite Dione using Cassini/VIMS data and their relationships to geological and/or morphological characteristics as seen in the Cassini/ISS images. This analysis focuses on a local region on Dione’s anti-saturnian hemisphere that was observed by VIMS with high spatial resolution during orbit 16 in October 2005. The results are incorporated into a global context provided by VIMS data acquired within Cassini’s first 50 orbits. Our results show that Dione’s surface is dominated by at least one global process. Bombardment by magnetospheric particles is consistent with the concentration of dark material and enhanced CO2 absorption on the trailing hemisphere of Dione independent of the geology. Local regions within this terrain indicate a special kind of resurfacing that probably is related to large-scale impact process. In contrast, the enhanced ice signature on the leading side is associated with the extended ejecta of the fresh impact crater Creusa (∼49°N/76°W). Although no geologically active regions could be identified, Dione’s tectonized regions observed with high spatial resolution partly show some clean H2O ice implying that tectonic processes could have continued into more recent times. |
| Keywords: | Saturn Satellites Surfaces Spectroscopy Geological processes |
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