¹F. Zambona et al. (>10)*
¹INAF-IAPS Istituto di Astrofisica e Planetologia Spaziali, Via del Fosso del Cavaliere, 100, 00133 Rome, Italy
*Find the extensive, full author and affiliation list on the publishers website

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 quadrangle 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 also are present, corresponding to particular features such as Antonia and Justina craters, which are also characterized by strong mafic absorptions. These quadrangles, especially Urbinia, are characterized by many bright ejecta, such as those of Tuccia crater, which are the highest reflectance materials on Vesta (Zambon et al., 2014). Dark areas are also present and correspond with regions with deeper OH-signature. The two quadrangle also 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.

Reference
Zambona F et al. (2015) Spectral Analysis of the Quadrangles Av-13 and Av-14 on Vesta. Icarus (in Press)
Link to Article [doi:10.1016/j.icarus.2015.05.015]
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