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  1. OA@INAF
  2. PRODOTTI RICERCA INAF
  3. 3 CONTRIBUTI IN ATTI DI CONVEGNO (Proceedings)
  4. 3.02 Abstract in Atti di convegno
Please use this identifier to cite or link to this item: http://hdl.handle.net/20.500.12386/25113
Title: Homogeneous spectral units on Ceres as inferred from Dawn/VIR
Authors: ZAMBON, Francesca 
DE SANCTIS, MARIA CRISTINA 
AMMANNITO, ELEONORA
TOSI, Federico 
Carrorro, Filippo Giacomo
CIARNIELLO, Mauro 
LONGOBARDO, ANDREA 
FONTE, SERGIO 
Giardino, Marco
PALOMBA, Ernesto 
FRIGERI, ALESSANDRO 
RAPONI, Andrea 
CAPRIA, MARIA TERESA 
FORMISANO, Michelangelo 
Russell, Christopher T.
Raymond, Carol A.
Issue Date: 2015
Volume: 2015 AGU Fall Meeting Abstracts
First Page: abstract ID P42A-06
Abstract: The dwarf planet Ceres, the largest object in the main asteroid belt, is being closely investigated by the NASA Dawn mission since the beginning of 2015. The Visible InfraRed (VIR) mapping spectrometer onboard Dawn has obtained hyperspectral images of Ceres, with spatial resolution increasing with decreasing distance from the surface. Using its overall spectral range from 0.25 to 5.1 μm, VIR will ultimately enable a comprehensive mapping of Ceres' mineralogy and surface temperature. Prior to Dawn, Ceres was extensively observed with the Hubble Space Telescope (HST), which resulted in low-resolution (30 km/px) albedo and color maps in the UV-VIS spectral domain. During the approach phase VIR acquired data with a spatial resolution of ~11 km/px, and confirmed the regional color trends identified by HST earlier. In the subsequent Survey mission phase hyperspectral coverage of Ceres was obtained at ~1.3 km/px, while in the High Altitude Mapping Orbit (HAMO) the nominal spatial resolution will be ~0.4 km/px. Unlike Vesta, which was investigated by Dawn in 2011-2012, the spectrum of Ceres does not display prominent absorption bands in the VIS-near IR range. Ground-based observations of Ceres highlighted a decrease in reflectance shortward of 0.4 μm and the existence of a broad absorption feature in the 3-μm region, associated with hydrated minerals. VIR data are key to unveiling the surface composition of Ceres at different spatial scales, providing answers to several unsolved questions. Compositionally homogeneous surface units, emerging in the VIS-IR spectral range sampled by VIR, are presented here for the first time. These units and their degree of similarity in terms of spectral parameters might provide insight on the surface processes that led to the composition observed nowadays. <P />
Conference Name: 2015 AGU (American Geophysical Union) Fall Meeting
Conference Place: San Francisco, CA, USA
Conference Date: 14-18 December, 2015
URI: http://hdl.handle.net/20.500.12386/25113
URL: https://agu.confex.com/agu/fm15/meetingapp.cgi/Paper/59425
https://abstractsearch.agu.org/meetings/2015/FM/P42A-06.html
Bibcode ADS: 2015AGUFM.P42A..06Z
Fulltext: open
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