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    The operational environment and rotational acceleration of asteroid (101955) Bennu from OSIRIS-REx observations

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    Author
    Hergenrother, C W
    Maleszewski, C K
    Nolan, M C
    Li, J-Y
    Drouet d'Aubigny, C Y
    Shelly, F C
    Howell, E S
    Kareta, T R
    Izawa, M R M
    Barucci, M A
    Bierhaus, E B
    Campins, H
    Chesley, S R
    Clark, B E
    Christensen, E J
    DellaGiustina, D N
    Fornasier, S
    Golish, D R
    Hartzell, C M
    Rizk, B
    Scheeres, D J
    Smith, P H
    Zou, X-D
    Lauretta, D S
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    Affiliation
    Univ Arizona, Steward Observ
    Univ Arizona, Dept Astron
    Issue Date
    2019-03-19
    
    Metadata
    Show full item record
    Publisher
    NATURE PUBLISHING GROUP
    Citation
    Hergenrother, C. W., Maleszewski, C. K., Nolan, M. C., Li, J. Y., d’Aubigny, C. D., Shelly, F. C., ... & Bierhaus, E. B. (2019). The operational environment and rotational acceleration of asteroid (101955) Bennu from OSIRIS-REx observations. Nature communications, 10(1), 1291.
    Journal
    NATURE COMMUNICATIONS
    Rights
    © The Author(s) 2019. This article is licensed under a Creative Commons Attribution 4.0 International License.
    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
    During its approach to asteroid (101955) Bennu, NASA's Origins, Spectral Interpretation, Resource Identification, and Security-Regolith Explorer (OSIRIS-REx) spacecraft surveyed Bennu's immediate environment, photometric properties, and rotation state. Discovery of a dusty environment, a natural satellite, or unexpected asteroid characteristics would have had consequences for the mission's safety and observation strategy. Here we show that spacecraft observations during this period were highly sensitive to satellites (sub-meter scale) but reveal none, although later navigational images indicate that further investigation is needed. We constrain average dust production in September 2018 from Bennu's surface to an upper limit of 150 g s-1 averaged over 34 min. Bennu's disk-integrated photometric phase function validates measurements from the pre-encounter astronomical campaign. We demonstrate that Bennu's rotation rate is accelerating continuously at 3.63 ± 0.52 × 10-6 degrees day-2, likely due to the Yarkovsky-O'Keefe-Radzievskii-Paddack (YORP) effect, with evolutionary implications.
    Note
    Open access journal
    ISSN
    2041-1723
    PubMed ID
    30890725
    DOI
    10.1038/s41467-019-09213-x
    Version
    Final published version
    Sponsors
    NASA [NNM10AA11C]; NASA PDART Grant [80NSSC18K0987]; National Aeronautics and Space Administration; CNES
    Additional Links
    https://www.nature.com/articles/s41467-019-09213-x
    ae974a485f413a2113503eed53cd6c53
    10.1038/s41467-019-09213-x
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