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    Ground-based characterization of Hayabusa2 mission target asteroid 162173 Ryugu: constraining mineralogical composition in preparation for spacecraft operations

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    Author
    Le Corre, Lucille
    Sanchez, Juan A
    Reddy, Vishnu
    Takir, Driss
    Cloutis, Edward A
    Thirouin, Audrey
    Becker, Kris J
    Li, Jian-Yang
    Sugita, Seiji
    Tatsumi, Eri
    Affiliation
    Univ Arizona, Lunar & Planetary Lab
    Issue Date
    2018-03-21
    Keywords
    techniques: spectroscopic
    meteorites, meteors, meteoroids
    minor planets, asteroids: general
    minor planets, asteroids: individual: Ryugu
    infrared: general
    
    Metadata
    Show full item record
    Publisher
    OXFORD UNIV PRESS
    Citation
    Lucille Le Corre, Juan A Sanchez, Vishnu Reddy, Driss Takir, Edward A Cloutis, Audrey Thirouin, Kris J Becker, Jian-Yang Li, Seiji Sugita, Eri Tatsumi; Ground-based characterization of Hayabusa2 mission target asteroid 162173 Ryugu: constraining mineralogical composition in preparation for spacecraft operations, Monthly Notices of the Royal Astronomical Society, Volume 475, Issue 1, 21 March 2018, Pages 614–623, https://doi.org/10.1093/mnras/stx3236
    Journal
    MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
    Rights
    © 2017 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society.
    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
    Asteroids that are targets of spacecraft missions are interesting because they present us with an opportunity to validate ground-based spectral observations. One such object is near-Earth asteroid (NEA) (162173) Ryugu, which is the target of the Japanese Space Agency's (JAXA) Hayabusa2 sample return mission. We observed Ryugu using the 3-m NASA Infrared Telescope Facility on Mauna Kea, Hawaii, on 2016 July 13 to constrain the object's surface composition, meteorite analogues, and link to other asteroids in the main belt and NEA populations. We also modelled its photometric properties using archival data. Using the Lommel-Seeliger model we computed the predicted flux for Ryugu at a wide range of viewing geometries as well as albedo quantities such as geometric albedo, phase integral, and spherical Bond albedo. Our computed albedo quantities are consistent with results from Ishiguro et al. Our spectral analysis has found a near-perfect match between our spectrum of Ryugu and those of NEA (85275) 1994 LY and Mars-crossing asteroid (316720) 1998 BE7, suggesting that their surface regoliths have similar composition. We compared Ryugu's spectrum with that of main belt asteroid (302) Clarissa, the largest asteroid in the Clarissa asteroid family, suggested as a possible source of Ryugu by Campins et al. We found that the spectrum of Clarissa shows significant differences with our spectrum of Ryugu, but it is similar to the spectrum obtained by Moskovitz et al. The best possible meteorite analogues for our spectrum of Ryugu are two CM2 carbonaceous chondrites, Mighei and ALH83100.
    ISSN
    0035-8711
    1365-2966
    DOI
    10.1093/mnras/stx3236
    Version
    Final published version
    Sponsors
    NASA Hayabusa2 Participating Scientist grant [NNX16AK77G]; NASA Near-Earth Object Observations Program [NNX14AL06G, NNX17AJ19G]; Canadian Space Agency; Natural Sciences and Engineering Research Council of Canada; Canada Foundation for Innovation; Manitoba Research Innovation Fund; University of Winnipeg; NASA Hayabusa2 Participating Scientists grants [NNX17AL02G]; NASA [NNH14CK55B]
    Additional Links
    https://academic.oup.com/mnras/article/475/1/614/4769653
    ae974a485f413a2113503eed53cd6c53
    10.1093/mnras/stx3236
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