Oxo Crater on (1) Ceres: Geological History and the Role of Water-ice
Cloutis, E. A.
Applin, D. M.
Le Corre, L.
Schmidt, B. E.
Russell, C. T.
AffiliationUniv Arizona, Lunar & Planetary Lab
Keywordsminor planets, asteroids: general
MetadataShow full item record
PublisherIOP PUBLISHING LTD
CitationOxo Crater on (1) Ceres: Geological History and the Role of Water-ice 2017, 154 (3):84 The Astronomical Journal
JournalThe Astronomical Journal
Rights© 2017. The American Astronomical Society. All rights reserved.
Collection InformationThis item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at firstname.lastname@example.org.
AbstractDwarf planet Ceres (empty set similar to 940 km) is the largest object in the main asteroid belt. Investigations suggest that Ceres is a thermally evolved, volatile-rich body with potential geological activity, a body that was never completely molten, but one that possibly partially differentiated into a rocky core and an ice-rich mantle, and may contain remnant internal liquid water. Thermal alteration and the infall of exogenic material contribute to producing a (dark) carbonaceous chondritic-like surface containing ammoniated phyllosilicates. Here we report imaging and spectroscopic analyses of data on the bright Oxo crater derived from the Framing Camera and the Visible and Infrared Spectrometer on board the Dawn spacecraft. We confirm that the transitional complex crater Oxo (empty set similar to 9 km) exhibits exposed surface water-ice. We show that this water-ice-rich material is associated exclusively with two lobate deposits at pole-facing scarps, deposits that also contain carbonates and admixed phyllosilicates. Due to Oxo's location at -4802 m below the cerean reference ellipsoid and its very young age of only 190 ka (1 sigma: +100 ka, -70 ka), Oxo is predestined for ongoing water-ice sublimation.
VersionFinal published version
SponsorsMax Planck Society; German Space Agency, DLR