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    DETECTION OF ROTATIONAL SPECTRAL VARIATION ON THE M-TYPE ASTEROID (16) PSYCHE

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    Sanchez_2017_AJ_153_29.pdf
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    Author
    Sanchez, Juan A.
    Reddy, V. cc
    Shepard, Michael K.
    Thomas, Cristina
    Cloutis, E. A. cc
    Takir, Driss
    Conrad, Albert cc
    Kiddell, Cain
    Applin, Daniel
    Affiliation
    Univ Arizona, LBT Observ
    Univ Arizona, Lunar & Planetary Lab
    Issue Date
    2016-12-28
    Keywords
    minor planets
    asteroids: general
    techniques: spectroscopic
    
    Metadata
    Show full item record
    Publisher
    IOP PUBLISHING LTD
    Citation
    DETECTION OF ROTATIONAL SPECTRAL VARIATION ON THE M-TYPE ASTEROID (16) PSYCHE 2016, 153 (1):29 The Astronomical Journal
    Journal
    The Astronomical Journal
    Rights
    © 2016. 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
    The asteroid (16) Psyche is of scientific interest because it contains similar to 1% of the total mass of the asteroid belt and is thought to be the remnant metallic core of a protoplanet. Radar observations have indicated the significant presence of metal on the surface with a small percentage of silicates. Prior ground-based observations showed rotational variations in the near-infrared (NIR) spectra and radar albedo of this asteroid. However, no comprehensive study that combines multi-wavelength data has been conducted so far. Here we present rotationally resolved NIR spectra (0.7-2.5 mu m) of (16) Psyche obtained with the NASA Infrared Telescope Facility. These data have been combined with shape models of the asteroid for each rotation phase. Spectral band parameters extracted from the NIR spectra show that the pyroxene band center varies from similar to 0.92 to 0.94 mu m. Band center values were used to calculate the pyroxene chemistry of the asteroid, whose average value was found to be Fs(30)En(65)Wo(5). Variations in the band depth (BD) were also observed, with values ranging from 1.0% to 1.5%. Using a new laboratory spectral calibration method, we estimated an average orthopyroxene content of 6% +/- 1%. The mass-deficit region of Psyche, which exhibits the highest radar albedo, also shows the highest value for the spectral slope and the minimum BD. The spectral characteristics of Psyche suggest that its parent body did not have the typical structure expected for a differentiated body or that the sequence of events that led to its current state was more complex than previously thought.
    ISSN
    1538-3881
    DOI
    10.3847/1538-3881/153/1/29
    Version
    Final published version
    Sponsors
    NASA [NNX13AP27G, NNX12AG12G, NNX11AN84G]; IRTF TAC; National Aeronautics and Space Administration [NNX12AF24G, NNX13AQ46G]; Canada Foundation for Innovation; Manitoba Research Innovations Fund; Canadian Space Agency; Natural Sciences and Engineering Research Council of Canada; University of Winnipeg
    Additional Links
    http://stacks.iop.org/1538-3881/153/i=1/a=29?key=crossref.26de63d3d798b379b85ded354bf80521
    ae974a485f413a2113503eed53cd6c53
    10.3847/1538-3881/153/1/29
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    UA Faculty Publications

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