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Heterogeneous mass distribution of the rubble-pile asteroid (101955) Bennu.
Scheeres, D J; French, A S; Tricarico, P; Chesley, S R; Takahashi, Y; Farnocchia, D; McMahon, J W; Brack, D N; Davis, A B; Ballouz, R-L; Jawin, E R; Rozitis, B; Emery, J P; Ryan, A J; Park, R S; Rush, B P; Mastrodemos, N; Kennedy, B M; Bellerose, J; Lubey, D P; Velez, D; Vaughan, A T; Leonard, J M; Geeraert, J; Page, B; Antreasian, P; Mazarico, E; Getzandanner, K; Rowlands, D; Moreau, M C; Small, J; Highsmith, D E; Goossens, S; Palmer, E E; Weirich, J R; Gaskell, R W; Barnouin, O S; Daly, M G; Seabrook, J A; Al Asad, M M; Philpott, L C; Johnson, C L; Hartzell, C M; Hamilton, V E; Michel, P; Walsh, K J; Nolan, M C; Lauretta, D S.
  • Scheeres DJ; Smead Department of Aerospace Engineering Sciences, University of Colorado, Boulder, CO, USA. scheeres@colorado.edu.
  • French AS; Smead Department of Aerospace Engineering Sciences, University of Colorado, Boulder, CO, USA.
  • Tricarico P; Planetary Science Institute, Tucson, AZ, USA.
  • Chesley SR; Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, USA.
  • Takahashi Y; Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, USA.
  • Farnocchia D; Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, USA.
  • McMahon JW; Smead Department of Aerospace Engineering Sciences, University of Colorado, Boulder, CO, USA.
  • Brack DN; Smead Department of Aerospace Engineering Sciences, University of Colorado, Boulder, CO, USA.
  • Davis AB; Smead Department of Aerospace Engineering Sciences, University of Colorado, Boulder, CO, USA.
  • Ballouz RL; Lunar and Planetary Laboratory, University of Arizona, Tucson, AZ, USA.
  • Jawin ER; Smithsonian Institution National Museum of Natural History, Washington, DC, USA.
  • Rozitis B; Planetary and Space Sciences, School of Physical Sciences, The Open University, Milton Keynes, UK.
  • Emery JP; Department of Astronomy and Planetary Sciences, Northern Arizona University, Flagstaff, AZ, USA.
  • Ryan AJ; Lunar and Planetary Laboratory, University of Arizona, Tucson, AZ, USA.
  • Park RS; Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, USA.
  • Rush BP; Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, USA.
  • Mastrodemos N; Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, USA.
  • Kennedy BM; Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, USA.
  • Bellerose J; Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, USA.
  • Lubey DP; Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, USA.
  • Velez D; Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, USA.
  • Vaughan AT; Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, USA.
  • Leonard JM; KinetX Aerospace Inc., Simi Valley, CA, USA.
  • Geeraert J; KinetX Aerospace Inc., Simi Valley, CA, USA.
  • Page B; KinetX Aerospace Inc., Simi Valley, CA, USA.
  • Antreasian P; KinetX Aerospace Inc., Simi Valley, CA, USA.
  • Mazarico E; NASA Goddard Space Flight Center, Greenbelt, MD, USA.
  • Getzandanner K; NASA Goddard Space Flight Center, Greenbelt, MD, USA.
  • Rowlands D; NASA Goddard Space Flight Center, Greenbelt, MD, USA.
  • Moreau MC; NASA Goddard Space Flight Center, Greenbelt, MD, USA.
  • Small J; Aerospace Corporation, Chantilly, VA, USA.
  • Highsmith DE; Aerospace Corporation, Chantilly, VA, USA.
  • Goossens S; NASA Goddard Space Flight Center, Greenbelt, MD, USA.
  • Palmer EE; Center for Research and Exploration in Space Science and Technology, University of Maryland, Baltimore County, Baltimore, MD, USA.
  • Weirich JR; Planetary Science Institute, Tucson, AZ, USA.
  • Gaskell RW; Planetary Science Institute, Tucson, AZ, USA.
  • Barnouin OS; Planetary Science Institute, Tucson, AZ, USA.
  • Daly MG; The Johns Hopkins University Applied Physics Laboratory, Laurel, MD, USA.
  • Seabrook JA; The Centre for Research in Earth and Space Science, York University, Toronto, ON, Canada.
  • Al Asad MM; The Centre for Research in Earth and Space Science, York University, Toronto, ON, Canada.
  • Philpott LC; Department of Earth, Ocean and Atmospheric Sciences, University of British Columbia, Vancouver, Canada.
  • Johnson CL; Department of Earth, Ocean and Atmospheric Sciences, University of British Columbia, Vancouver, Canada.
  • Hartzell CM; Planetary Science Institute, Tucson, AZ, USA.
  • Hamilton VE; Department of Earth, Ocean and Atmospheric Sciences, University of British Columbia, Vancouver, Canada.
  • Michel P; Department of Aerospace Engineering, University of Maryland, College Park, MD, USA.
  • Walsh KJ; Department of Space Studies, Southwest Research Institute, Boulder, CO, USA.
  • Nolan MC; Université Côte d'Azur, Observatoire de la Côte d'Azur, CNRS, Laboratoire Lagrange, Nice, France.
  • Lauretta DS; Department of Space Studies, Southwest Research Institute, Boulder, CO, USA.
Sci Adv ; 6(41)2020 Oct.
Article en En | MEDLINE | ID: mdl-33033036
ABSTRACT
The gravity field of a small body provides insight into its internal mass distribution. We used two approaches to measure the gravity field of the rubble-pile asteroid (101955) Bennu (i) tracking and modeling the spacecraft in orbit about the asteroid and (ii) tracking and modeling pebble-sized particles naturally ejected from Bennu's surface into sustained orbits. These approaches yield statistically consistent results up to degree and order 3, with the particle-based field being statistically significant up to degree and order 9. Comparisons with a constant-density shape model show that Bennu has a heterogeneous mass distribution. These deviations can be modeled with lower densities at Bennu's equatorial bulge and center. The lower-density equator is consistent with recent migration and redistribution of material. The lower-density center is consistent with a past period of rapid rotation, either from a previous Yarkovsky-O'Keefe-Radzievskii-Paddack cycle or arising during Bennu's accretion following the disruption of its parent body.
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Texto completo: 1 Banco de datos: MEDLINE Idioma: En Año: 2020 Tipo del documento: Article
Texto completo
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PubMed Links
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Texto completo: 1 Banco de datos: MEDLINE Idioma: En Año: 2020 Tipo del documento: Article