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Surveying Vesta's styles of space weathering and surface mixing

Blewett, D. and Denevi, B.W. and Roatsch, Thomas and Schröder, S.E. and Tosi, F. and Desanctis, M.C. and Reddy, V. and LeCorre, Lucille and Pieters, C. and Raymond, C.A. and Russell, C.T. (2014) Surveying Vesta's styles of space weathering and surface mixing. 45th LPSC 2014, 17-21 Mar 2014, Houston, TX.

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The Dawn spacecraft's mission at Vesta [1] has revealed a world that, although much smaller than the Moon or Mercury, has experienced planet-like processes and undergone a complicated geological evolution [2]. One fascinating characteristic of Vesta is the manner in which the regolith evolves in response to exposure to the space environment. In general, vestan space weathering is dominated by admixture of low-reflectance material delivered by carbonaceous chondrite (CC) impactors [3-7]. As a result, freshly exposed vestan basaltic material tends to become darker with time, and the strong absorption bands (near 1000 and 2000 nm) caused by ferrous iron in pyroxene become shallower. Darkening and decreased band contrast are hallmarks of lunar space weathering, however on the Moon these are accompanied by a strong increase in the continuum slope (reddening) [e.g., 8, 9]. The cause of the spectral changes on the Moon is the accumulation of micro- and nanophase metallic iron as a result of melting and vaporization by micrometeoroid bombardment and/or solar-wind sputtering [reviewed by 10]. We are conducting a survey of impact mixing and regolith maturation trends in different regions of Vesta. The goals are to document the range of space weathering styles on Vesta, and to examine how the observed trends can give clues to the composition of the material that is undergoing space weathering. The findings should help to further understanding of space weathering in the asteroid belt, and hence as a general phenomenon across the Solar System. Here we present results from two locations that illustrate Vesta's spectral diversity: Vibidia crater and near Oppia crater.

Item URL in elib:https://elib.dlr.de/88467/
Document Type:Conference or Workshop Item (Speech)
Title:Surveying Vesta's styles of space weathering and surface mixing
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Blewett, D.Johns Hopkins University Applied Physics Laboratory 11100 Johns Hopkins Rd. Laurel, MD 20723-6099, USAUNSPECIFIED
Denevi, B.W.Johns Hopkins University Applied Physics Laboratory, Laurel, MD, USUNSPECIFIED
Roatsch, Thomasthomas.roatsch (at) dlr.deUNSPECIFIED
Schröder, S.E.stefanus.schroeder (at) dlr.deUNSPECIFIED
Tosi, F.INAF-IASF Istituto di Astrofisica Spaziale e Fisica Cosmica, Roma ItalyUNSPECIFIED
Desanctis, M.C.INAF, Istituto di Astrofisica Spaziale e Fisica Cosmica, Roma, ItalyUNSPECIFIED
LeCorre, LucillePSI, TucsonUNSPECIFIED
Pieters, C.Brown University, Providence, RI, USAUNSPECIFIED
Raymond, C.A.Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109-8099, USAUNSPECIFIED
Russell, C.T.Institute of Geophysics, University of California, Los Angeles, Los Angeles, CA 90095UNSPECIFIED
Date:March 2014
Refereed publication:No
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Keywords:Asteorids, Vesta, Dawn
Event Title:45th LPSC 2014
Event Location:Houston, TX
Event Type:international Conference
Event Dates:17-21 Mar 2014
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 - Project DAWN
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Planetary Geology
Deposited By: Roatsch, Dr.rer.nat. Thomas
Deposited On:26 May 2014 09:25
Last Modified:26 May 2014 09:25

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