Detection of Rotational Acceleration of Bennu Using HST Light Curve Observations
AuthorNolan, M. C.
Howell, E. S.
Scheeres, D. J.
McMahon, J. W.
Hergenrother, C. W.
Emery, J. P.
Noll, K. S.
Chesley, S. R.
Lauretta, D. S.
AffiliationUniv Arizona, Lunar & Planetary Lab
MetadataShow full item record
PublisherAmerican Geophysical Union
CitationNolan, M. C., Howell, E. S., Scheeres, D. J., McMahon, J. W., Golubov, O., Hergenrother, C. W., et al. ( 2019). Detection of rotational acceleration of Bennu using HST light curve observations. Geophysical Research Letters, 46, 1956–1962. https://doi.org/10.1029/2018GL080658
JournalGeophysical Research Letters
Rights©2019. American Geophysical Union. All Rights Reserved. This article has been contributed to by US Government employees and their work is in the public domain in the USA.
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AbstractWe observed the near‐Earth asteroid (101955) Bennu from the ground in 1999 and 2005, and with the Hubble Space Telescope (HST) in 2012, to constrain its rotation rate. The data reveal an acceleration of 2.64 ± 1.05 × 10^−6 deg/day^2, which could be due to a change in the moment of inertia of Bennu or to spin up from the Yarkovsky‐O'Keefe‐Radzievskii‐Paddack effect or other source of angular momentum. The best solution is within 1 σ of the period determined by Nolan et al. (2013, https://doi.org/10.1016/j.icarus.2013.05.028). The Origins, Spectral Interpretation, Resource Identification, and Security–Regolith Explorer (OSIRIS‐REx) mission will determine the rotation state independently in 2019. Those measurements should show whether the change in rotation rate is a steady increase (due, e.g., to the Yarkovsky‐O'Keefe‐Radzievskii‐Paddack effect) or some other phenomenon. The precise shape and surface properties measured by the OSIRIS‐REx science team will allow for a better understanding of variations in rotation rate of small asteroids.
Note6 month embargo; first published: 31 January 2019
VersionFinal published version
SponsorsNASA - NNM10AA11C NASA - NNX14AN13G NASA - NAS 5‐26555