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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/20.500.12386/25905
Title: Composition of the northern regions of Vesta analyzed by the Dawn mission
Authors: Combe, Jean-Philippe
McCord, Thomas B.
McFadden, Lucy A.
IEVA, Simone 
TOSI, Federico 
LONGOBARDO, ANDREA 
FRIGERI, ALESSANDRO 
DE SANCTIS, MARIA CRISTINA 
AMMANNITO, ELEONORA
Ruesch, Ottaviano
PALOMBA, Ernesto 
Fulchignoni, Marcello
Raymond, Carol A.
Russell, Christopher T.
Issue Date: 2015
Journal: ICARUS 
Number: 259
First Page: 53
Abstract: The surface composition of the northern regions of Vesta, observed by the Dawn spacecraft, offers the possibility to test several hypotheses related to impact-related processes. We used mostly imaging spectrometry in the visible and near infrared to assess the distribution of mafic lithologies, hydrated components and albedo properties, and use the link with howardite, eucrite and diogenite meteorites (HEDs) to investigate the origin of those materials. We established that Rheasilvia ejecta reached part of the northern regions, and have a diogenitic-rich composition characteristic of the lower crust. Investigations of the antipodes of the two major impact basins (Rheasilvia and Veneneia) did not reveal any correlation between geographic location, geological features and the surface composition. The northern wall of Mamilia crater, which is one of the freshest craters above 22°N, contains relatively pure eucritic-rich, diogenitic-rich and dark, hydrated materials, which are representative of the rest of the northern regions (and most of Vesta), with the exception of an olivine-like component found in Bellicia crater by Ammannito et al. (Ammannito, E. et al. [2013a]. Nature 504(7478), 122–125). We determined that similar types of materials are found in various proportions over a large region, including Bellicia, Arruntia and Pomponia craters, and their origin does not seem to be related to Rheasilvia ejecta. These materials are hydrated, which could indicate an exogenous origin, and not as dark as expected for carbonaceous chondrites, which likely compose the majority of dark hydrated materials on Vesta. Spectral mixture analysis reveals that mixtures of pyroxenes (hypersthene, pigeonite and diopside) could offer an alternative interpretation to olivine in this area.
Acknowledgments: Acknowledgments The funding for this research was provided under the NASA Dawn mission through a subcontract 2090-S-MB516 from the University of California, Los Angeles. The VIR instrument and VIR team were founded by ASI (Italian Space Agency) and INAF (Istituto Nazionale di Astrofisica).
URI: http://hdl.handle.net/20.500.12386/25905
URL: https://www.sciencedirect.com/science/article/abs/pii/S0019103515001694
ISSN: 0019-1035
DOI: 10.1016/j.icarus.2015.04.026
Bibcode ADS: 2015Icar..259...53C
Fulltext: open
Appears in Collections:1.01 Articoli in rivista

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