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Ejecta from the DART-produced active asteroid Dimorphos.
Li, Jian-Yang; Hirabayashi, Masatoshi; Farnham, Tony L; Sunshine, Jessica M; Knight, Matthew M; Tancredi, Gonzalo; Moreno, Fernando; Murphy, Brian; Opitom, Cyrielle; Chesley, Steve; Scheeres, Daniel J; Thomas, Cristina A; Fahnestock, Eugene G; Cheng, Andrew F; Dressel, Linda; Ernst, Carolyn M; Ferrari, Fabio; Fitzsimmons, Alan; Ieva, Simone; Ivanovski, Stavro L; Kareta, Theodore; Kolokolova, Ludmilla; Lister, Tim; Raducan, Sabina D; Rivkin, Andrew S; Rossi, Alessandro; Soldini, Stefania; Stickle, Angela M; Vick, Alison; Vincent, Jean-Baptiste; Weaver, Harold A; Bagnulo, Stefano; Bannister, Michele T; Cambioni, Saverio; Campo Bagatin, Adriano; Chabot, Nancy L; Cremonese, Gabriele; Daly, R Terik; Dotto, Elisabetta; Glenar, David A; Granvik, Mikael; Hasselmann, Pedro H; Herreros, Isabel; Jacobson, Seth; Jutzi, Martin; Kohout, Tomas; La Forgia, Fiorangela; Lazzarin, Monica; Lin, Zhong-Yi; Lolachi, Ramin.
Affiliation
  • Li JY; Planetary Science Institute, Tucson, AZ, USA. jyli@psi.edu.
  • Hirabayashi M; Department of Aerospace Engineering, Department of Geosciences, Auburn University, Auburn, AL, USA.
  • Farnham TL; Department of Astronomy, University of Maryland, College Park, MD, USA.
  • Sunshine JM; Department of Astronomy, University of Maryland, College Park, MD, USA.
  • Knight MM; Physics Department, United States Naval Academy, Annapolis, MD, USA.
  • Tancredi G; Departamento de Astronomía, Facultad de Ciencias, Udelar, Uruguay.
  • Moreno F; Instituto de Astrofísica de Andalucía, CSIC, Granada, Spain.
  • Murphy B; University of Edinburgh, Royal Observatory, Edinburgh, UK.
  • Opitom C; University of Edinburgh, Royal Observatory, Edinburgh, UK.
  • Chesley S; Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, USA.
  • Scheeres DJ; Aerospace Engineering Sciences, Colorado Center for Astrodynamics Research, University of Colorado, Boulder, CO, USA.
  • Thomas CA; Northern Arizona University, Flagstaff, AZ, USA.
  • Fahnestock EG; Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, USA.
  • Cheng AF; Applied Physics Laboratory, Johns Hopkins University, Laurel, MD, USA.
  • Dressel L; Space Telescope Science Institute, Baltimore, MD, USA.
  • Ernst CM; Applied Physics Laboratory, Johns Hopkins University, Laurel, MD, USA.
  • Ferrari F; Department of Aerospace Science and Technology, Politecnico di Milano, Milan, Italy.
  • Fitzsimmons A; School of Mathematics and Physics, Queen's University Belfast, Belfast, UK.
  • Ieva S; INAF - Osservatorio Astronomico di Roma, Rome, Italy.
  • Ivanovski SL; INAF Osservatorio Astronomico di Trieste, Trieste, Italy.
  • Kareta T; Lowell Observatory, Flagstaff, AZ, USA.
  • Kolokolova L; Lunar and Planetary Laboratory, University of Arizona, Tucson, AZ, USA.
  • Lister T; Department of Astronomy, University of Maryland, College Park, MD, USA.
  • Raducan SD; Las Cumbres Observatory, Goleta, CA, USA.
  • Rivkin AS; Space Research and Planetary Sciences, Physikalisches Institut, University of Bern, Bern, Switzerland.
  • Rossi A; Applied Physics Laboratory, Johns Hopkins University, Laurel, MD, USA.
  • Soldini S; IFAC-CNR, Florence, Italy.
  • Stickle AM; Department of Mechanical, Materials and Aerospace Engineering, University of Liverpool, Liverpool, UK.
  • Vick A; Applied Physics Laboratory, Johns Hopkins University, Laurel, MD, USA.
  • Vincent JB; Space Telescope Science Institute, Baltimore, MD, USA.
  • Weaver HA; DLR Institute of Planetary Research, Berlin, Germany.
  • Bagnulo S; Applied Physics Laboratory, Johns Hopkins University, Laurel, MD, USA.
  • Bannister MT; Armagh Observatory and Planetarium, Armagh, UK.
  • Cambioni S; School of Physical and Chemical Sciences, Te Kura Matu, University of Canterbury, Christchurch, New Zealand.
  • Campo Bagatin A; Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, MA, USA.
  • Chabot NL; Instituto de Física Aplicada a las Ciencias y las Tecnologías, Universidad de Alicante, Alicante, Spain.
  • Cremonese G; Departamento de Física, Ingeniería de Sistemas y Teoría de la Señal, Universidad de Alicante, Alicante, Spain.
  • Daly RT; Applied Physics Laboratory, Johns Hopkins University, Laurel, MD, USA.
  • Dotto E; INAF Osservatorio Astronomico di Padova, Padua, Italy.
  • Glenar DA; Applied Physics Laboratory, Johns Hopkins University, Laurel, MD, USA.
  • Granvik M; INAF - Osservatorio Astronomico di Roma, Rome, Italy.
  • Hasselmann PH; Center for Space Science and Technology, University of Maryland, Baltimore County, Baltimore, MD, USA.
  • Herreros I; Solar System Exploration Division, NASA Goddard Space Flight Center, Greenbelt, MD, USA.
  • Jacobson S; Department of Physics, University of Helsinki, Helsinki, Finland.
  • Jutzi M; Asteroid Engineering Laboratory, Luleå University of Technology, Kiruna, Sweden.
  • Kohout T; INAF - Osservatorio Astronomico di Roma, Rome, Italy.
  • La Forgia F; Centro de Astrobiología (CAB), CSIC-INTA, Torrejón de Ardoz, Madrid, Spain.
  • Lazzarin M; Department of Earth and Environmental Sciences, Michigan State University, East Lansing, MI, USA.
  • Lin ZY; Space Research and Planetary Sciences, Physikalisches Institut, University of Bern, Bern, Switzerland.
  • Lolachi R; Institute of Geology of the Czech Academy of Sciences, Prague, Czech Republic.
Nature ; 616(7957): 452-456, 2023 04.
Article in En | MEDLINE | ID: mdl-36858074
ABSTRACT
Some active asteroids have been proposed to be formed as a result of impact events1. Because active asteroids are generally discovered by chance only after their tails have fully formed, the process of how impact ejecta evolve into a tail has, to our knowledge, not been directly observed. The Double Asteroid Redirection Test (DART) mission of NASA2, in addition to having successfully changed the orbital period of Dimorphos3, demonstrated the activation process of an asteroid resulting from an impact under precisely known conditions. Here we report the observations of the DART impact ejecta with the Hubble Space Telescope from impact time T + 15 min to T + 18.5 days at spatial resolutions of around 2.1 km per pixel. Our observations reveal the complex evolution of the ejecta, which are first dominated by the gravitational interaction between the Didymos binary system and the ejected dust and subsequently by solar radiation pressure. The lowest-speed ejecta dispersed through a sustained tail that had a consistent morphology with previously observed asteroid tails thought to be produced by an impact4,5. The evolution of the ejecta after the controlled impact experiment of DART thus provides a framework for understanding the fundamental mechanisms that act on asteroids disrupted by a natural impact1,6.
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Full text: 1 Collection: 01-internacional Database: MEDLINE Language: En Journal: Nature Year: 2023 Document type: Article Affiliation country:
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Full text: 1 Collection: 01-internacional Database: MEDLINE Language: En Journal: Nature Year: 2023 Document type: Article Affiliation country: