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    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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    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 Lab
    Issue Date
    2018-07
    Keywords
    meteorites, meteors, meteoroids
    minor planets, asteroids: general
    techniques: spectroscopic
    
    Metadata
    Show full item record
    Publisher
    IOP PUBLISHING LTD
    Citation
    Paul S. Hardersen et al 2018 AJ 156 11
    Journal
    ASTRONOMICAL JOURNAL
    Rights
    © 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
    1538-3881
    DOI
    10.3847/1538-3881/aac3d2
    Version
    Final published version
    Sponsors
    NASA Planetary Astronomy Program Grant [NNX14AJ37G]
    Additional Links
    http://stacks.iop.org/1538-3881/156/i=1/a=11?key=crossref.80878d20760871ba057b44c45af8e36e
    ae974a485f413a2113503eed53cd6c53
    10.3847/1538-3881/aac3d2
    Scopus Count
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    UA Faculty Publications

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