SPH simulations of high-speed collisions between asteroids and comets

J. Rozehnal, M. Brož, D. Nesvorný, K. J. Walsh, D. D. Durda, D. C. Richardson, E. Asphaug

Research output: Contribution to journalArticlepeer-review

2 Scopus citations


We studied impact processes by means of smoothed-particle hydrodynamics (SPH) simulations. The method was applied to modelling formation of main-belt families during the cometary bombardment (either early or late, ∼3.85Gy ago). If asteroids were bombarded by comets, as predicted by the Nice model, hundreds of asteroid families (catastrophic disruptions of diameter D≥100km bodies) should have been created, but the observed number is only 20. Therefore we computed a standard set of 125 simulations of collisions between representative D=100km asteroids and high-speed icy projectiles (comets), in the range 8 to 15km/s. According to our results, the largest remnant mass Mlr is similar as in low-speed collisions, due to appropriate scaling with the effective strength Qeff, but the largest fragment mass Mlf exhibits systematic differences — it is typically smaller for craterings and bigger for super-catastrophic events. This trend does not, however, explain the non-existence of old families. The respective parametric relations can be used in other statistical (Monte-Carlo) models to better understand collisions between asteroidal and cometary populations.

Original languageEnglish (US)
Article number115064
StatePublished - Sep 1 2022


  • Asteroids
  • Collisional physics
  • Impact processes
  • Origin
  • Solar system

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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