Dynamical Evolution of Simulated Particles Ejected From Asteroid Bennu

Jay W. McMahon, Daniel J. Scheeres, Steven R. Chesley, Andrew French, Daniel Brack, Davide Farnocchia, Yu Takahashi, Benjamin Rozitis, Pasquale Tricarico, Erwan Mazarico, Beau Bierhaus, Joshua P. Emery, Carl W. Hergenrother, Dante S. Lauretta

Research output: Contribution to journalArticlepeer-review

6 Scopus citations

Abstract

In early 2019, the OSIRIS-REx spacecraft discovered small particles being ejected from the surface of the near-Earth asteroid Bennu.sww Although they were seen to be ejected at slow speeds, on the order of tens of cm/s, a number of particles were surprisingly seen to orbit for multiple revolutions and days, which requires a dynamical mechanism to quickly and substantially modify the orbit to prevent re-impact upon their first periapse passage. This paper demonstrates that, based on simulations constrained by the conditions of the observed events, the combined effects of gravity, solar radiation pressure, and thermal radiation pressure from Bennu can produce many sustained orbits for ejected particles. Furthermore, the simulated populations exhibit two interesting phenomena that could play an important role in the geophysical evolution of bodies such as Bennu. First, small particles (<1 cm radius) are preferentially removed from the system, which could lead to a deficit of such particles on the surface. Second, re-impacting particles preferentially land near or on the equatorial bulge of Bennu. Over time, this can lead to crater in-filling and growth of the equatorial radius without requiring landslides.

Original languageEnglish (US)
Article numbere2019JE006229
JournalJournal of Geophysical Research: Planets
Volume125
Issue number8
DOIs
StatePublished - Aug 1 2020

ASJC Scopus subject areas

  • Geophysics
  • Forestry
  • Oceanography
  • Aquatic Science
  • Ecology
  • Water Science and Technology
  • Soil Science
  • Geochemistry and Petrology
  • Earth-Surface Processes
  • Atmospheric Science
  • Earth and Planetary Sciences (miscellaneous)
  • Space and Planetary Science
  • Palaeontology

Fingerprint Dive into the research topics of 'Dynamical Evolution of Simulated Particles Ejected From Asteroid Bennu'. Together they form a unique fingerprint.

Cite this