On the origin of a double, oblique impact on Mars

Details On the origin of a double, oblique impact on Mars On the origin of a double, oblique impact on Mars

Oct 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008icar..197..452c&link_type=abstract

Icarus, Volume 197, Issue 2, p. 452-457.

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Scientific paper

A double, oblique impact feature north of Olympus Mons provides a unique opportunity to investigate the event that formed it. The sizes of the craters, their ellipticity, shapes of ejecta blankets, separation from each other, and positions relative to each other, all give us information about the event. Coupling this information with an existing model of meteoritic flight through an atmosphere allows us to test several possible scenarios for the event (object type and origin, pre-entry trajectory, atmospheric trajectory, prevailing atmospheric density). We find it highly improbable that the impactor was simply an extra-martian asteroid or comet. We also find that it is unlikely to have been a double-asteroid or a tidally fractured one, but is more likely to have been a Mars-orbiting moonlet whose orbit tidally decayed, and that denser atmospheric conditions than today's may have prevailed when it impacted.

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