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Spectrophotometric Modeling of Rhea's Surface from Vims Data

Ciarniello, M. and Capaccioni, F. and Filacchione, G. and Clark, R. N. and Cruikshank, D. P. and Cerroni, P. and Coradini, A. and Brown, R. H. and Buratti, B.J. and Tosi, F. and Stephan, K. (2010) Spectrophotometric Modeling of Rhea's Surface from Vims Data. In: AAS, 42. DPS-Meeting, 03.10.-08.10.2010, Pasadena, USA.

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The huge amount of hyperspectral data from the VIMS (Visual Infrared Mapping Spectrometer) instrument onboard Cassini spacecraft allows the study of the surface properties of icy bodies in Saturnian system in the 0.35 - 5.1 um spectral range. In this work we have analyzed 112 full disk images of Rhea with solar phase angle range 0°-110°. The goal of this work is to perform a quantitative evaluation of physical parameters affecting the spectrophotometric behavior of the satellite's surface. We have applied the Hapke model (Hapke, 1993) in order to describe both the full-disk phase function at each wavelength and the spectrum at given phase angles. With this approach we are able to constrain ice grain size and the amount of organic contaminants as well as the opposition effect surge and the surface roughness of Rhea. The best fit model is represented by an intraparticle mixture of water ice and Triton tholin (99.6%-0.4%) and particle radius of 38 um. What emerges from the analysis is that wavelength dependent parameters, i.e. opposition surge width and amplitude (h, Bo) and single particle phase function parameters (b,v), are correlated with the estimated single scattering albedo of particles (w), as expected for media with grain size larger than the wavelength. Regarding the opposition effect, we find that both Shadow Hiding and Coherent Backscattering contribute. The surface roughness parameter we obtain is theta=33°. This value is fairly high if compared to surface structures (e.g. reliefs or craters), which supports the hypotesis of a correlation with size scales on the order of particle clumping. This research is fully supported by an Italian Space Agency grant.

Item URL in elib:https://elib.dlr.de/73059/
Document Type:Conference or Workshop Item (UNSPECIFIED)
Title:Spectrophotometric Modeling of Rhea's Surface from Vims Data
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Filacchione, G.INAF-IASF, Rome, ItalyUNSPECIFIED
Clark, R. N.US Geological Survey, Denver, CO, USAUNSPECIFIED
Cruikshank, D. P.NASA Ames Research Center, Moffett Field, CA, USAUNSPECIFIED
Brown, R. H.Lunar and Planetary Lab, University of Arizona, Tucson, AZ, USAUNSPECIFIED
Buratti, B.J.Jet Propulsion Laboratory, Pasadena, CAUNSPECIFIED
Tosi, F.INAF-IASF Istituto di Astrofisica Spaziale e Fisica Cosmica, Roma ItalyUNSPECIFIED
Stephan, K. katrin.stephan (at) dlr.deUNSPECIFIED
Journal or Publication Title:AAS
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Keywords:Cassini, Titan, VIMS, Spectrophometric
Event Title:DPS-Meeting
Event Location:Pasadena, USA
Event Type:international Conference
Event Dates:03.10.-08.10.2010
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:16 Dec 2011 16:40
Last Modified:16 Dec 2011 16:40

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