Size-velocity distribution of large ejecta fragments

Details Size-velocity distribution of large ejecta fragments Size-velocity distribution of large ejecta fragments

Aug 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986icar...67..224v&link_type=abstract

Icarus (ISSN 0019-1035), vol. 67, Aug. 1986, p. 224-236.

Other

54

Ejecta, Fragments, Particle Size Distribution, Planetary Craters, Lunar Craters, Mars Surface, Radial Velocity, Velocity Distribution

Scientific paper

The characteristics of three primary extraterrestrial craters and the associated craters were examined to generate a size-velocity distribution for large ejecta fragments. The lunar craters Copernicus and Aristillus and the Martian crater Dv on Olympus Mons were used. Attention was focused on the radial distances between the primary and secondary crater centers and the diameters of the secondaries. The primary craters selected are all relatively young, which avoided contamination of the data from secondaries from other primaries. Attempts were made to account for the speed of the hypervelocity impacts and the elemental compositions of the impactors. An apparent velocity cutoff of about 1 km/sec was observed for the secondaries, which implies that no meteoroid impacts can accelerate ejecta to escape velocities from the moon or Mars.

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