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

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 sate...

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Vydáno v:	Nature communications Ročník 10; číslo 1; s. 1291 - 10
Hlavní autoři:	Shelly, F. C., Howell, E. S., Fornasier, S., Golish, D. R., Scheeres, D. J., Small, J., Hanna, K.L. Donaldson, Warren, T., Millington-Veloza, S., Allen, B., McGraw, L., Johnson, C.L., Susorney, H.C.M., Hanna, R.D., Ciceri, F., Glotch, T., Thomas, C.A., Tachibana, S., Epifani, E. Mazzotta, Crombie, M.K., Izawa, M.R.M., Licandro, J., Chesley, S.R., Elder, C.M., Corvin, M., Leonard, J.M., Lessac-Chenen, E., Levine, A., Page, B., Wolff, P., Hayne, P., Deshapriya, J.D.P., Bierhaus, E.B., Buck, B., Church, E., Coltrin, M., Deguzman, A., Ellis, D., Fisher, A., Freund, S., Gonzales, S., Haas, P., Hasten, A., Hilbert, A., Mario, C., Miller, C., Mirfakhrai, A., Skeen, M., Ballouz, R.-L., Bandrowski, R., Bennett, C.A., Brodbeck, J., Chojnacki, M., Colpo, A., DellaGiustina, D.N., Enos, R., Ferro, T., Fisher, M.R., Hammond, D., Harshman, K., Herzog, K., Janakus, A., Munoz, R., Polit, A., Ramos, N., Tang, Y.H., Westermann, M., Hagee, W., Hill, J., Piacentine, N., Sandford, S. A., Barker, M., Emr, C., Fennell, D., Folta, D., Hyde, K., Ingegneri, A., Jones, N., Liounis, A., Lorentson, C., Moore, W., Moreau, M., Rieger, S., Morris, M., Nakamura-Messenger, K., Dill, K., Molaro, J.L., Zou, X.-D., French, A.S., Jawin, E.R., Killgore, M., Chodas, M., Freemantle, J., Craft, K., Nair, A.H., Perry, M.E., Roberts, J.H., Manzoni, C., May, B.
Médium:	Journal Article
Jazyk:	angličtina
Vydáno:	Goddard Space Flight Center Nature Research 19.03.2019 Nature Publishing Group UK Nature Publishing Group Nature Portfolio
Témata:	639/33/445/847 639/33/445/848 Apollo asteroids Asteroid missions Asteroids Astrophysics Celestial bodies Engineering Sciences Geosciences (General) Humanities and Social Sciences Instrumentation Materials multidisciplinary Natural satellites Photometry Physics Regolith Rotation Satellites Science Science (multidisciplinary) Spacecraft Rings and moons Asteroids Comets and Kuiper belt
ISSN:	2041-1723, 2041-1723
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Popis
Shrnutí:	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 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/sq. day, likely due to the Yarkovsky–O’Keefe–Radzievskii–Paddack (YORP) effect, with evolutionary implications.
Bibliografie:	GSFC Goddard Space Flight Center ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 14 content type line 23
ISSN:	2041-1723 2041-1723
DOI:	10.1038/s41467-019-09213-x