Motion of Dust Ejected from the Surface of Asteroid (101955) Bennu
Yu Jiang, J\"urgen Schmidt

TL;DR
This study models the trajectories of dust particles ejected from asteroid Bennu, revealing their potential to orbit, escape, or re-impact, and highlighting their role in transporting organic material across space.
Contribution
It provides a detailed numerical analysis of dust grain trajectories around Bennu, considering various sizes and forces, which was not previously done.
Findings
Smaller grains (<1μm) either re-impact or escape immediately.
Larger grains (>10μm) can orbit Bennu multiple times before impacting or escaping.
Dust can reach interplanetary space, transporting organic matter.
Abstract
From Jan. 6, 2019 to Feb. 18, 2019, OSIRIS-REx observed asteroid (101955) Bennu ejecting 11 plumes of dust, of which part is escaping and another part is re-captured by the asteroid. The relative magnitudes of the typical forces acting on the emitted dust are quite different from the environments of the planets and other minor planets in the solar system. Here we show that ejected dust grains from the surface of Bennu can be caught in the gravitational field of Bennu. To this end, we calculated numerically the trajectories of dust grains of various sizes, from the 0.1mum to the ten millimeter range. The shape and the fate of an emitted cloud of particles depend on the size of the grains: smaller grains form a more narrowly confined dust trail while trails formed by larger grains disperse more rapidly. Four different fates are possible for ejected dust. All grains with radius less than…
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