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The Impact History of Vesta: New Views from the Dawn MissionThe Dawn mission has completed its Survey and High-Altitude Mapping Orbit (HAMO) phases at Vesta, resulting in 60-70 meter per pixel imaging, high-resolution image-derived topography, and visual and infrared spectral data covering up to approx.50 degrees north latitude (the north pole was in shadow during these mission phases). These data have provided unprecedented views of the south polar impact structure first detected in HST imaging [1], now named Rheasilvia, and in addition hint at the existence of a population of ancient basins. Smaller craters are seen at all stages from fresh to highly-eroded, with some exposing atypically bright or dark material. The morphology of some craters has been strongly influenced by regional slope. Detailed studies of crater morphology are underway. We have begun making crater counts to constrain the relative ages of different regions of the surface, and are working towards developing an absolute cratering chronology for Vesta's surface.
Document ID
20110023653
Acquisition Source
Johnson Space Center
Document Type
Conference Paper
Authors
OBrien, D. P. (Lunar and Planetary Inst. Houston, TX, United States)
Marchi, S. (Southwest Research Inst. Boulder, CO, United States)
Schenk, P. (Lunar and Planetary Inst. Houston, TX, United States)
Mittlefehldt, D. W. (NASA Johnson Space Center Houston, TX, United States)
Jaumann, R. (Deutsche Forschungsanstalt fuer Luft- und Raumfahrt Berlin, Germany)
Ammannito, E. (Istituto Nazionale di Astrofisica Rome, Italy)
Buczkowski, D. L. (Johns Hopkins Univ. Laurel, MD, United States)
DeSanctis, M. C. (Istituto Nazionale di Astrofisica Rome, Italy)
Filacchione, G. (Istituto Nazionale di Astrofisica Rome, Italy)
Gaskell, R. (Lunar and Planetary Inst. Houston, TX, United States)
Hoffmann, M. (Max-Planck-Inst. fuer Sonnensystemforschung Lindau, Germany)
Joy, S. (California Univ. Los Angeles, CA, United States)
LeCorre, L. (Max-Planck-Inst. fuer Sonnensystemforschung Lindau, Germany)
Li, Y.-Y. (Maryland Univ. College Park, MD, United States)
Nathunes, A. (Max-Planck-Inst. fuer Sonnensystemforschung Lindau, Germany)
Polanskey, C. (Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Preusker, F. (Deutsche Forschungsanstalt fuer Luft- und Raumfahrt Berlin, Germany)
Rayman, M. (Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Raymond, C. A. (Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Reddy, V. (Max-Planck-Inst. fuer Sonnensystemforschung Lindau, Germany)
Roatsch, T. (Deutsche Forschungsanstalt fuer Luft- und Raumfahrt Berlin, Germany)
Russell, C. T. (California Univ. Los Angeles, CA, United States)
Turrini, D. (Istituto Nazionale di Astrofisica Rome, Italy)
Vincent. J.-B. (Max-Planck-Inst. fuer Sonnensystemforschung Lindau, Germany)
Date Acquired
August 25, 2013
Publication Date
January 1, 2011
Subject Category
Astrophysics
Report/Patent Number
JSC-CN-25399
Meeting Information
Meeting: Early Solar System Impact Bombardment II Workshop
Location: Houston, TX
Country: United States
Start Date: February 1, 2012
End Date: February 3, 2012
Sponsors: Lunar and Planetary Inst., Universities Space Research Association
Funding Number(s)
CONTRACT_GRANT: NNX10AR21G
Distribution Limits
Public
Copyright
Public Use Permitted.

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