Basalt or Not? Near-infrared Spectra, Surface Mineralogical Estimates, and Meteorite Analogs for 33 V-p-type Asteroids
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Hardersen_2018_AJ_156_11.pdf
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Final Published version
Author
Hardersen, Paul S.Reddy, Vishnu
Cloutis, Edward
Nowinski, Matt
Dievendorf, Margaret
Genet, Russell M.
Becker, Savan
Roberts, Rachel
Affiliation
Univ Arizona, Dept Planetary Sci, Lunar & Planetary LabIssue Date
2018-07
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IOP PUBLISHING LTDCitation
Paul S. Hardersen et al 2018 AJ 156 11Journal
ASTRONOMICAL JOURNALRights
© 2018. The American Astronomical Society. All rights reserved.Collection Information
This 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 repository@u.library.arizona.edu.Abstract
Investigations of the main asteroid belt and efforts to constrain that population's physical characteristics involve the daunting task of studying hundreds of thousands of small bodies. Taxonomic systems are routinely employed to study the large-scale nature of the asteroid belt because they utilize common observational parameters, but asteroid taxonomies only define broadly observable properties and are not compositionally diagnostic. This work builds upon the results of work by Hardersen et al., which has the goal of constraining the abundance and distribution of basaltic asteroids throughout the main asteroid belt. We report on the near-infrared (NIR: 0.7 to 2.5 mu m) reflectance spectra, surface mineralogical characterizations, analysis of spectral band parameters, and meteorite analogs for 33 V-p asteroids. NIR reflectance spectroscopy is an effective remote sensing technique to detect most pyroxene group minerals, which are spectrally distinct with two very broad spectral absorptions at similar to 0.9 and similar to 1.9 mu m. Combined with the results from Hardersen et al., we identify basaltic asteroids for similar to 95% (39/41) of our inner-belt Vp sample, but only similar to 25% (2/8) of the outer-belt Vp sample. Inner-belt basaltic asteroids are most likely associated with (4) Vesta and represent impact fragments ejected from previous collisions. Outer-belt V-p asteroids exhibit disparate spectral, mineralogical, and meteorite analog characteristics and likely originate from diverse parent bodies. The discovery of two additional likely basaltic asteroids provides additional evidence for an outer-belt basaltic asteroid population.ISSN
1538-3881Version
Final published versionSponsors
NASA Planetary Astronomy Program Grant [NNX14AJ37G]Additional Links
http://stacks.iop.org/1538-3881/156/i=1/a=11?key=crossref.80878d20760871ba057b44c45af8e36eae974a485f413a2113503eed53cd6c53
10.3847/1538-3881/aac3d2