| Autor: |
Nolan, Michael C., Howell, Ellen S., Scheeres, Daniel J., McMahon, Jay W., Golubov, Oleksiy, Hergenrother, Carl W., Emery, Joshua P., Noll, Keith S., Chesley, Steven R., Lauretta, Dante S. |
| Rok vydání: |
2019 |
| Předmět: |
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| Druh dokumentu: |
Working Paper |
| DOI: |
10.1029/2018GL080658 |
| Popis: |
We observed the near-Earth asteroid (101955) Bennu from the ground in 1999 and 2005, and with the Hubble Space Telescope in 2012, to constrain its rotation rate. The data reveal an acceleration of $2.64 \pm 1.05 \times 10^{-6} \mathrm{deg\ day}^{-2}$, which could be due to a change in the moment of inertia of Bennu or to spin up from the YORP effect or other source of angular momentum. The best solution is within 1 sigma of the period determined by Nolan et al. (2013). The 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, for example, to the YORP 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. |
| Databáze: |
arXiv |
| Externí odkaz: |
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