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Surface Composition of Vesta: Issues and Integrated Approach |
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| Authors: | Carle M. Pieters Lucy A. McFadden Thomas Prettyman M. Cristina De Sanctis Thomas B. McCord Takahiro Hiroi Rachel Klima Jian-Yang Li Ralf Jaumann |
| Affiliation: | 1. Department of Geological Sciences, Brown University, Providence, RI, 02912, USA 2. NASA Goddard Space Flight Center, Greenbelt, MD, 20771, USA 3. Planetary Science Institute, Tucson, AZ, 87519, USA 4. INAF, Istituto di Astrofisica Spaziale e Fisica Cosmica, Area di Ricerca di Tor Vergata, Via del Fosso del Cavaliere, 00133, Rome, Italy 5. Bear Fight Institute, 22 Fiddler??s Road, Winthrop, WA, 98862, USA 6. Applied Physics Laboratory, Johns Hopkins University, Laurel, MD, 20723, USA 7. Department of Astronomy, University of Maryland, College Park, MD, 20742, USA 8. Institute of Planetary Research, Deutsches Zentrum fuer Luft- und Raumfahrt, Berlin, Germany |
| Abstract: | The instruments on the Dawn spacecraft are exceptionally well suited to characterize and map the surface composition of Vesta in an integrated manner. These include a framing camera with multispectral capabilities, a high spectral resolution near-infrared imaging spectrometer, and a gamma-ray and neutron spectrometer. Three examples of issues addressed at Vesta are: (1) What is the composition of Vesta??s interior and differentiation state as exposed by the Great South Crater? (2) How has space weathering affected Vesta, both globally and at a local scale? and (3) Are volatiles or hydrated material present on Vesta??s surface? We predict that Dawn finds many surprises, such as an olivine-bearing mantle exposed near the south-pole, a weakly or un-weathered surface that has been relatively recently resurfaced, and a very thin layer of surficial volatiles derived from interaction with the solar wind. |
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