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<p>Hypervelocity impacts play a significant role in the evolution of asteroids, causing material to be ejected and partially reaccreted. However, the dynamics and evolution of ejected material in a binary asteroid system have never been observed directly. Observations of Double Asteroid Redirection Test (DART) impact on asteroid Dimorphos have revealed features on a scale of thousands of kilometers, including curved ejecta streams and a tail bifurcation originating from the Didymos system. Here we show that these features result naturally from the dynamical interaction of the ejecta with the binary system and solar radiation pressure. These mechanisms may be used to constrain the orbit of a secondary body, or to investigate the binary nature of an asteroid. Also, they may reveal breakup or fission events in active asteroids, and help determine the asteroid’s properties following an impact event. In the case of DART, our findings suggest that Dimorphos is a very weak, rubble-pile asteroid, with an ejecta mass estimated to be in the range of (1.1-5.5)×10<sup>7 </sup>kg.</p>

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Morphology of ejecta features from the impact on asteroid Dimorphos

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年2月14日

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  • Fabio Ferrari,
  • Paolo Panicucci,
  • Gianmario Merisio,
  • Carmine Giordano,
  • Mattia Pugliatti,
  • Jian-Yang Li,
  • Eugene G. Fahnestock,
  • Sabina D. Raducan,
  • Martin Jutzi,
  • Stefania Soldini,
  • Masatoshi Hirabayashi,
  • Colby C. Merrill,
  • Patrick Michel,
  • Fernando Moreno,
  • Gonzalo Tancredi,
  • Jessica M. Sunshine,
  • Jens Ormö,
  • Isabel Herreros,
  • Harrison Agrusa,
  • Ozgur Karatekin,
  • Yun Zhang,
  • Nancy L. Chabot,
  • Andrew F. Cheng,
  • Derek C. Richardson,
  • Andrew S. Rivkin,
  • Adriano Campo Bagatin,
  • Tony L. Farnham,
  • Stavro Ivanovski,
  • Alice Lucchetti,
  • Maurizio Pajola,
  • Alessandro Rossi,
  • Daniel J. Scheeres,
  • Filippo Tusberti

摘要

Hypervelocity impacts play a significant role in the evolution of asteroids, causing material to be ejected and partially reaccreted. However, the dynamics and evolution of ejected material in a binary asteroid system have never been observed directly. Observations of Double Asteroid Redirection Test (DART) impact on asteroid Dimorphos have revealed features on a scale of thousands of kilometers, including curved ejecta streams and a tail bifurcation originating from the Didymos system. Here we show that these features result naturally from the dynamical interaction of the ejecta with the binary system and solar radiation pressure. These mechanisms may be used to constrain the orbit of a secondary body, or to investigate the binary nature of an asteroid. Also, they may reveal breakup or fission events in active asteroids, and help determine the asteroid’s properties following an impact event. In the case of DART, our findings suggest that Dimorphos is a very weak, rubble-pile asteroid, with an ejecta mass estimated to be in the range of (1.1-5.5)×107 kg.