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  1. OA@INAF
  2. PRODOTTI RICERCA INAF
  3. 1 CONTRIBUTI IN RIVISTE (Journal articles)
  4. 1.01 Articoli in rivista
Please use this identifier to cite or link to this item: http://hdl.handle.net/20.500.12386/25953
Title: Global variations in regolith properties on asteroid Vesta from Dawn's low-altitude mapping orbit
Authors: Denevi, Brett W.
Beck, Andrew W.
Coman, Ecaterina I.
Thomson, Bradley J.
AMMANNITO, ELEONORA
Blewett, David T.
Sunshine, Jessica M.
DE SANCTIS, MARIA CRISTINA 
Li, Jian-Yang
Marchi, Simone
Mittlefehldt, David W.
Petro, Noah E.
Raymond, Carol A.
Russell, Christopher T.
Issue Date: 2016
Journal: METEORITICS & PLANETARY SCIENCE 
Number: 51
Issue: 12
First Page: 2366
Abstract: We investigate the depth, variability, and history of regolith on asteroid Vesta using data from the Dawn spacecraft. High-resolution (15-20 m pixel<SUP>-1</SUP>) Framing Camera images are used to assess the presence of morphologic indicators of a shallow regolith, including the presence of blocks in crater ejecta, spur-and-gully-type features in crater walls, and the retention of small (<300 m) impact craters. Such features reveal that the broad, regional heterogeneities observed on Vesta in terms of albedo and surface composition extend to the physical properties of the upper 1 km of the surface. Regions of thin regolith are found within the Rheasilvia basin and at equatorial latitudes from 0-90°E and 260-360°E. Craters in these areas that appear to excavate material from beneath the regolith have more diogenitic (Rheasilvia, 0-90°E) and cumulate eucrite (260-360°E) compositions. A region of especially thick regolith, where depths generally exceed 1 km, is found from 100-240°E and corresponds to heavily cratered, low-albedo surface with a basaltic eucrite composition enriched in carbonaceous chondrite material. The presence of a thick regolith in this area supports the idea that this is an ancient terrain that has accumulated a larger component of exogenic debris. We find evidence for the gardening of crater ejecta toward more howarditic compositions, consistent with regolith mixing being the dominant form of "weathering" on Vesta.
URI: http://hdl.handle.net/20.500.12386/25953
URL: https://onlinelibrary.wiley.com/doi/full/10.1111/maps.12729
ISSN: 1086-9379
DOI: 10.1111/maps.12729
Bibcode ADS: 2016M&PS...51.2366D
Fulltext: reserved
Appears in Collections:1.01 Articoli in rivista

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