The meteoroid environment and impacts on Phobos

Christou, A.; Oberst, J.; Lupovka, V.; Dmitriev, V.; Gritsevich, M.

Авторы: Christou A., Oberst J., Lupovka V., Dmitriev V., Gritsevich M.
Журнал: Planetary and Space Science
Том: 102
Год издания: 2014
Издательство: Elsevier BV
Местоположение издательства: Netherlands
Первая страница: 164
Последняя страница: 170
DOI: 10.1016/j.pss.2013.07.012
Аннотация: We review current knowledge of the flux of meteoroids on Phobos, a key to interpreting its cratering record and understanding the origin of the Martian satellite system. Past observational attempts to estimate the flux of small (mm to cm) meteoroids as meteors in the Martian atmosphere highlight the need for customised instrumentation onboard future missions bound for Mars. The temporal distribution of cometary meteoroid streams as predicted by recent work is non-uniform; we advocate emplacing seismic stations on Phobos or cameras optimised to monitor the Martian atmosphere for meteors as a means to elucidate this and other features of the meteoroid population. We construct a model of the sporadic flux of metre-sized or larger meteoroids and use it to predict a leading/trailing ratio in crater density of ~4 if crater production by asteroidal meteoroids dominates over that by cometary ones. It is found that the observed distribution of craters ≥ 100 m as determined from spacecraft images is consistent with a 50/50 contribution from the two meteoroid populations in our model. A need for more complete models of the meteoroid flux is identified. Finally, the prospects for new observational constraints on the meteoroid environment are reviewed.
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