Spectral analysis of the quadrangles Av-13 and Av-14 on Vesta

Journal
Date Issued
2015
Author(s)
•
•
Combe, J.-Ph.
•
•
•
Ammannito, E.
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•
Blewett, D.T.
•
Scully, J.
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•
Denevi, B.
•
Yingst, A.
•
Russell, C.T.
•
Raymond, C.A.
DOI
Description
Acknowledgments VIR is funded by the Italian Space Agency -ASI and was developed under the leadership of INAF-Istituto di Astrofisica e Planetologia Spaziale , Rome, Italy. The instrument was built by Selex-Galileo, Florence-Italy. The authors acknowledge the support of the Dawn Science, Instrument, and Operations Teams. This work was supported by ASI and NASAs.
Abstract
The Av-13 (Tuccia) and Av-14 (Urbinia) quadrangles are located in the south-west region of Vesta. They are characterized by a large topographic variability, from the highest (Vestalia terra highlands) to the lowest (Rheasilvia basin). Many geological units in these quadrangles are not associated with mineralogical variability, as shown by the color-composite maps. Maps of mafic absorption band-center position reveal that the principal lithology is eucrite-rich howardite, but diogenite-rich howardite areas are also present, corresponding to particular features such as Antonia and Justina craters, which are characterized by strong mafic absorptions. These quadrangles, especially Urbinia, contain many bright ejecta, such as those of Tuccia crater, which are the highest reflectance materials on Vesta (Zambon et al., 2014). Dark areas are present and correspond to regions with deeper OH-signature. The two quadrangles contain many vertical ridge crests associated with the Rheasilvia impact. These ridges do not show mineralogical differences with respect to their surroundings, but have a distinctive appearance in color-ratio composite images.
Volume
259
Start page
181
Uri
Url
Issn Identifier
0019-1035
Ads BibCode
2015Icar..259..181Z
Rights
open.access
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