Physics
Scientific paper
Nov 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002esasp.500..859b&link_type=abstract
In: Proceedings of Asteroids, Comets, Meteors - ACM 2002. International Conference, 29 July - 2 August 2002, Berlin, Germany. Ed
Physics
2
Hypervelocity Impacts, Ices
Scientific paper
Hypervelocity impact experiments on porous ice targets are reported. The projectiles were 1 mm dia. copper spheres. Impact speeds were in the range 1 to 7 km s-1. The targets were porous ice (50% porosity) at 255K. Crater shape evolved as the impact speed increased. At low speed craters had a deep, relatively narrow central pit with a shallow wider crater on the surface. At higher speeds the central pit became broader. At 1 km s-1 the projectile can be recovered intact from beneath the crater. At 3 km s-1 large fragments of the projectile were recovered but at 5+ km s-1 no macroscopic fragments of projectile were recovered. Extrapolation of the results from the lab (energy 10-100 J) to the energy scale (26 GJ) of the Deep Impact Mission is problematic as, at the moment, the data do not support such extrapolations over the large range of energy involved.
Burchell Mark J.
Grey Ivan D. S.
Johnson Eric E.
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