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Episodes of particle ejection from the surface of the active asteroid (101955) Bennu.
Lauretta, D S; Hergenrother, C W; Chesley, S R; Leonard, J M; Pelgrift, J Y; Adam, C D; Al Asad, M; Antreasian, P G; Ballouz, R-L; Becker, K J; Bennett, C A; Bos, B J; Bottke, W F; Brozovic, M; Campins, H; Connolly, H C; Daly, M G; Davis, A B; de León, J; DellaGiustina, D N; Drouet d'Aubigny, C Y; Dworkin, J P; Emery, J P; Farnocchia, D; Glavin, D P; Golish, D R; Hartzell, C M; Jacobson, R A; Jawin, E R; Jenniskens, P; Kidd, J N; Lessac-Chenen, E J; Li, J-Y; Libourel, G; Licandro, J; Liounis, A J; Maleszewski, C K; Manzoni, C; May, B; McCarthy, L K; McMahon, J W; Michel, P; Molaro, J L; Moreau, M C; Nelson, D S; Owen, W M; Rizk, B; Roper, H L; Rozitis, B; Sahr, E M.
Afiliação
  • Lauretta DS; Lunar and Planetary Laboratory, University of Arizona, Tucson, AZ, USA. lauretta@orex.lpl.arizona.edu chergen@lpl.arizona.edu.
  • Hergenrother CW; Lunar and Planetary Laboratory, University of Arizona, Tucson, AZ, USA. lauretta@orex.lpl.arizona.edu chergen@lpl.arizona.edu.
  • Chesley SR; Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, USA.
  • Leonard JM; KinetX Aerospace, Simi Valley, CA, USA.
  • Pelgrift JY; KinetX Aerospace, Simi Valley, CA, USA.
  • Adam CD; KinetX Aerospace, Simi Valley, CA, USA.
  • Al Asad M; Department of Earth, Ocean, and Atmospheric Sciences, University of British Columbia, Vancouver, BC, Canada.
  • Antreasian PG; KinetX Aerospace, Simi Valley, CA, USA.
  • Ballouz RL; Lunar and Planetary Laboratory, University of Arizona, Tucson, AZ, USA.
  • Becker KJ; Lunar and Planetary Laboratory, University of Arizona, Tucson, AZ, USA.
  • Bennett CA; Lunar and Planetary Laboratory, University of Arizona, Tucson, AZ, USA.
  • Bos BJ; NASA Goddard Space Flight Center, Greenbelt, MD, USA.
  • Bottke WF; Southwest Research Institute, Boulder, CO, USA.
  • Brozovic M; Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, USA.
  • Campins H; Department of Physics, University of Central Florida, Orlando, FL, USA.
  • Connolly HC; Department of Geology, Rowan University, Glassboro, NJ, USA.
  • Daly MG; Lunar and Planetary Laboratory, University of Arizona, Tucson, AZ, USA.
  • Davis AB; The Centre for Research in Earth and Space Science, York University, Toronto, ON, Canada.
  • de León J; Smead Department of Aerospace Engineering Sciences, University of Colorado, Boulder, CO, USA.
  • DellaGiustina DN; Instituto de Astrofísica de Canarias and Departamento de Astrofísica, Universidad de La Laguna, Tenerife, Spain.
  • Drouet d'Aubigny CY; Lunar and Planetary Laboratory, University of Arizona, Tucson, AZ, USA.
  • Dworkin JP; Department of Geosciences, University of Arizona, Tucson, AZ, USA.
  • Emery JP; Lunar and Planetary Laboratory, University of Arizona, Tucson, AZ, USA.
  • Farnocchia D; NASA Goddard Space Flight Center, Greenbelt, MD, USA.
  • Glavin DP; Department of Earth and Planetary Sciences, University of Tennessee, Knoxville, TN, USA.
  • Golish DR; Department of Astronomy and Planetary Sciences, Northern Arizona University, Flagstaff, AZ, USA.
  • Hartzell CM; Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, USA.
  • Jacobson RA; NASA Goddard Space Flight Center, Greenbelt, MD, USA.
  • Jawin ER; Lunar and Planetary Laboratory, University of Arizona, Tucson, AZ, USA.
  • Jenniskens P; Department of Aerospace Engineering, University of Maryland, College Park, MD, USA.
  • Kidd JN; Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, USA.
  • Lessac-Chenen EJ; Smithsonian Institution National Museum of Natural History, Washington, DC, USA.
  • Li JY; SETI (Search for Extraterrestrial Intelligence) Institute, Mountain View, CA, USA.
  • Libourel G; Lunar and Planetary Laboratory, University of Arizona, Tucson, AZ, USA.
  • Licandro J; KinetX Aerospace, Simi Valley, CA, USA.
  • Liounis AJ; Planetary Science Institute, Tucson, AZ, USA.
  • Maleszewski CK; Université Côte d'Azur, Observatoire de la Côte d'Azur, CNRS (Centre national de la recherche scientifique), Laboratoire Lagrange, Nice, France.
  • Manzoni C; Instituto de Astrofísica de Canarias and Departamento de Astrofísica, Universidad de La Laguna, Tenerife, Spain.
  • May B; NASA Goddard Space Flight Center, Greenbelt, MD, USA.
  • McCarthy LK; Lunar and Planetary Laboratory, University of Arizona, Tucson, AZ, USA.
  • McMahon JW; London Stereoscopic Company, London, UK.
  • Michel P; London Stereoscopic Company, London, UK.
  • Molaro JL; KinetX Aerospace, Simi Valley, CA, USA.
  • Moreau MC; Smead Department of Aerospace Engineering Sciences, University of Colorado, Boulder, CO, USA.
  • Nelson DS; Université Côte d'Azur, Observatoire de la Côte d'Azur, CNRS (Centre national de la recherche scientifique), Laboratoire Lagrange, Nice, France.
  • Owen WM; Planetary Science Institute, Tucson, AZ, USA.
  • Rizk B; NASA Goddard Space Flight Center, Greenbelt, MD, USA.
  • Roper HL; KinetX Aerospace, Simi Valley, CA, USA.
  • Rozitis B; Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, USA.
  • Sahr EM; Lunar and Planetary Laboratory, University of Arizona, Tucson, AZ, USA.
Science ; 366(6470)2019 12 06.
Article em En | MEDLINE | ID: mdl-31806784
ABSTRACT
Active asteroids are those that show evidence of ongoing mass loss. We report repeated instances of particle ejection from the surface of (101955) Bennu, demonstrating that it is an active asteroid. The ejection events were imaged by the OSIRIS-REx (Origins, Spectral Interpretation, Resource Identification, and Security-Regolith Explorer) spacecraft. For the three largest observed events, we estimated the ejected particle velocities and sizes, event times, source regions, and energies. We also determined the trajectories and photometric properties of several gravitationally bound particles that orbited temporarily in the Bennu environment. We consider multiple hypotheses for the mechanisms that lead to particle ejection for the largest events, including rotational disruption, electrostatic lofting, ice sublimation, phyllosilicate dehydration, meteoroid impacts, thermal stress fracturing, and secondary impacts.
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Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Idioma: En Ano de publicação: 2019 Tipo de documento: Article
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Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Idioma: En Ano de publicação: 2019 Tipo de documento: Article