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Vesta’s Geological Features

Jaumann, R. and Russell, C.T. and Raymond, C.A. and Pieters, C. and Yingst, R. A. and Williams, D.A. and Buczkowski, D.L. and Schenk, P. and De Sanctis, M.C. (2014) Vesta’s Geological Features. Vesta in the Light of Dawn: First Exploration of a Protoplanet in the Asteroid Belt, 03.-05. Feb. 2014, Houston, Texas, USA.

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The Dawn spacecraft collected over 28,000 images and a wealth of spectral data of Vesta’s surface. These data enable analysis of Vesta’s diverse geology including impact craters of all sizes and unusual shapes, a variety of ejecta blankets, large troughs, impact basins, enigmatic dark material, and considerable evidence for mass wasting and surface alteration processes. Two large impact basins, Veneneia underlying the larger Rheasilvia basin dominate the south polar region. The depression surrounding Vesta’s south pole was formed by two giant impacts about one billion and two billion years ago. Vesta’s global tectonic patterns (two distinct sets of large troughs orthogonal to the axes of the impacts) strongly correlate with the locations of the two south polar impact basins, and were likely created by their formation. Numerous unusual asymmetric impact craters and ejecta indicate the strong influence of topographic slope in cratering on Vesta. One type of gully in crater walls is interpreted to form by dry granular flow, but another type is consistent with transient water flow. Very steep topographic slopes near to the angle of repose are common; slope failures make resurfacing due to impacts and their associated gravitational slumping and seismic effects an important geologic process on Vesta. Clusters of pits in combination with impact melt suggest the presence of volatile materials underlying that melt in some crater floors. Relatively dark material of uncertain origin is intermixed in the regolith layers and partially excavated by younger impacts yielding dark outcrops, rays and ejecta. Vesta’s surface is reworked by intense impacts and thus much younger than the formation of its crust.

Item URL in elib:https://elib.dlr.de/86923/
Document Type:Conference or Workshop Item (Speech)
Title:Vesta’s Geological Features
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Jaumann, R.ralf.jaumann (at) dlr.deUNSPECIFIED
Russell, C.T.Institute of Geophysics, University of California, Los Angeles, Los Angeles, CA 90095UNSPECIFIED
Raymond, C.A.Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109-8099, USAUNSPECIFIED
Pieters, C.Brown University, Providence, RI, USAUNSPECIFIED
Yingst, R. A.Planetary Science Institute, Tucson, AZ, United States.UNSPECIFIED
Williams, D.A.Arizona State UniversityUNSPECIFIED
Buczkowski, D.L.Johns Hopkins University Applied Physics Laboratory 11100 Johns Hopkins Rd. Laurel, MD 20723-6099, USAUNSPECIFIED
Schenk, P.Lunar and Planetary Institute, Houston, TX, USAUNSPECIFIED
De Sanctis, M.C.Istituto Nazionale di Astrofisica, Rome, Italy.UNSPECIFIED
Date:February 2014
Refereed publication:No
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Keywords:DAWN, Vesta, geology
Event Title:Vesta in the Light of Dawn: First Exploration of a Protoplanet in the Asteroid Belt
Event Location:Houston, Texas, USA
Event Type:international Conference
Event Dates:03.-05. Feb. 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: Voigt, Joana
Deposited On:04 Feb 2014 08:47
Last Modified:08 May 2014 23:26

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