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Constraints on the Compositions of Phobos and Deimos from Mineral Absorptions
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Author and Affiliation:
Fraeman, A. A.(Washington Univ., Saint Louis, MO, United States);
Murchie, S. L.(Johns Hopkins Univ., Applied Physics Lab., Laurel, MD, United States);
Arvidson, R. E.(Washington Univ., Saint Louis, MO, United States);
Rivkin, A. S.(Johns Hopkins Univ., Applied Physics Lab., Laurel, MD, United States);
Morris, R. V.(NASA Johnson Space Center, Houston, TX, United States)
Abstract: The compositions of Phobos and Deimos have remained controversial despite multiple Earth- and space-based observations acquired during the last 40 years. Phobos is composed of at least two spectral units that are both dark yet distinct at visible to near infrared wavelenghts; a spectrally red-sloped "red" unit covers most of the moon and a less red-sloped "blue" unit is present in the ejecta of the approximately 9-km diameter impact crater Stickney [1,2]. Deimos is similar spectrally to Phobos' "red" unit [2]. Here we report results from mapping mineral absorptions on Phobos and Deimos using visible/near infrared observations from the Compact Reconnaissance Imaging Spectrometer for Mars (CRISM). We find evidence for an absorption feature at 0.65 m in the Phobos red unit and Deimos that is reproducible in observations from other instruments. The phase responsible is uncertain but may be a Fe-bearing phyllosilicate and/or graphite, consistent with the notion that Phobos and Deimos have compositions similar to CM carbonaceous chondrites [3].
Publication Date: Mar 18, 2013
Document ID:
20130009708
(Acquired Feb 14, 2013)
Subject Category: LUNAR AND PLANETARY SCIENCE AND EXPLORATION
Report/Patent Number: JS-CN-27909
Document Type: Extended Abstract
Meeting Information: Lunar and Planetary Science Conference; 18-22 Mar. 2013; The woodlands, TX; United States
Meeting Sponsor: Lunar and Planetary Inst.; Houston, TX, United States
Financial Sponsor: NASA Johnson Space Center; Houston, TX, United States
Organization Source: NASA Johnson Space Center; Houston, TX, United States
Description: 2p; In English; Original contains color illustrations
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: Copyright; Distribution as joint owner in the copyright
NASA Terms: ABSORPTION SPECTRA; CARBONACEOUS CHONDRITES; DEIMOS; IMAGING SPECTROMETERS; MARS (PLANET); METEORITIC COMPOSITION; MINERAL DEPOSITS; MINERALOGY; NEAR INFRARED RADIATION; PHOBOS; RECONNAISSANCE; SPECTRAL REFLECTANCE
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