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Vesta Mineralogy after Dawn global Observations

De Sanctis, M.C and Ammannito, E. and Capaccioni, F. and Capria, M. and Frigeri, A. and Marchi, S. and Palomba, E. and Tosi, F. and Combe, J.P. and Russell, C.T. (2012) Vesta Mineralogy after Dawn global Observations. 44th annual meeting of the Division for Planetary Sciences of the American Astronomical Society, 14.-19.10.12, Reno, Nevada,USA.

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Abstract

Abstract The Dawn mission has completed its mapping phases at Vesta and millions of spectra have been acquired by the Visible and InfraRed Mapping Spectrometer, VIR(1). VIR characterizes and maps the mineral distribution on Vesta -strengthening the Vesta HED linkage- and provides new insights into Vesta’s formation and evolution(2,3). VIR spectra are dominated by pyroxene absorptions near 0.9 and 2.0 µm and large thermal emission beyond 3.5 µm. Although almost all surface materials exhibit howardite-like spectra, some large regions can be interpreted to be richer in eucritic (basaltic) material and others richer in diogenititic (Mg-orthopyroxenitic) material. The Rheasilvia basin contains Mg-pyroxene-rich terrains for example. Vesta' s surface shows considerable diversity at local scales. Many bright and dark areas(3,4) are associated with various geological features and show remarkably different morphology. Moreover, VIR detected statistically significant, but weak, variations at 2.8 μm that have been interpreted as indicating the presence of OH-bearing phases on the surface(5). The OH distribution is uneven with large regions lacking this absorption feature. Associations of 2.8 μm band with morphological structures indicate complex process responsible for OH. Vesta exhibits large spectral variations that often correlate with geological structures, indicating a complex geological and evolutionary history, more similar to that of the terrestrial planets than to other asteroids visited by spacecrafts. Grateful Support of the Dawn Instrument, Operations, and Science Teams is acknowledged. This work is supported by an the Italian Space Agency (ASI) grant n°I/004/12/0, a DLR grant, and by NASA through the Dawn project and the Dawn at Vesta Participating Scientist grant. References: (1) De Sanctis M.C. et al., Space Sci. Rev., 2010. (2) Russell C.T et al., Science, 336, 684 2012. (3) De Sanctis M.C. et al., Science, 336, 697, 2012 (4) McCord, Nature, submitted (5) De Sanctis M.C. et al., Science, submitted

Item URL in elib:https://elib.dlr.de/80290/
Document Type:Conference or Workshop Item (Paper)
Title:Vesta Mineralogy after Dawn global Observations
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
De Sanctis, M.C INAF, Istituto di Astrofisica e Planetologia Spaziali, Rome, 00133, ItalyUNSPECIFIED
Ammannito, E. INAF, Istituto di Astrofisica e Planetologia Spaziali, Rome, 00133, ItalyUNSPECIFIED
Capaccioni, F. INAF, Istituto di Astrofisica e Planetologia Spaziali, Rome, 00133, ItalyUNSPECIFIED
Capria, M. INAF, Istituto di Astrofisica e Planetologia Spaziali, Rome, 00133, ItalyUNSPECIFIED
Frigeri, A. INAF, Istituto di Astrofisica e Planetologia Spaziali, Rome, 00133, ItalyUNSPECIFIED
Marchi, S.NASA Lunar Science Institute, Southwest Research Institute, Boulder, COUNSPECIFIED
Palomba, E. INAF, Istituto di Astrofisica e Planetologia Spaziali, Rome, 00133, ItalyUNSPECIFIED
Tosi, F. INAF, Istituto di Astrofisica e Planetologia Spaziali, Rome, 00133, ItalyUNSPECIFIED
Combe, J.P.Bear Fight Institute, P.O. Box 667, 22 Fiddler's Rd, Winthrop, WA 98862UNSPECIFIED
Russell, C.T.Institute of Geophysics, University of California, Los Angeles, Los Angeles, CA 90095UNSPECIFIED
Date:October 2012
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:Vesta Mineralogy
Event Title:44th annual meeting of the Division for Planetary Sciences of the American Astronomical Society
Event Location:Reno, Nevada,USA
Event Type:international Conference
Event Dates:14.-19.10.12
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Science and Exploration
DLR - Research area:Raumfahrt
DLR - Program:R EW - Erforschung des Weltraums
DLR - Research theme (Project):R - Projekt DAWN
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Planetary Geology
Deposited By: Aydin, Zeynep
Deposited On:09 Jan 2013 11:14
Last Modified:09 Jan 2013 11:14

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