Other
Scientific paper
Sep 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996dps....28.0425l&link_type=abstract
American Astronomical Society, DPS meeting #28, #04.25; Bulletin of the American Astronomical Society, Vol. 28, p.1075
Other
Scientific paper
Experimental studies of hypervelocity impacts on CO_2 targets are presented. A two stage light gas gun was used to accelerate spherical projectiles of 0.4 - 2.0 mm in diameter to velocities in the range 2 - 5 km/s. The projectiles were phosphor bronze (rho = 8900 kg/m3), stainless steel (7800), titanium (4540), ruby (3985), aluminium (2710), and nylon (1150). Targets were CO_2 ice blocks of mass of about 3 kg and porosity about 10%. For comparison, some shots onto similar size H_2O targets were also performed. The total number of succesfull shots was about 50. Morphology of the craters namely the profiles of their axial cross sections were measured. From these, the craters' diameter, depth, and volume were calculated. For some well formed craters, the central pit characteristics were measured as well. On the basis of these experimental data, several dependencies concerning crater parameter against projectile energy, projectile momentum and projectile density have been established. These include diameter, depth, depth/diameter ratio, crater volume, mass excavated, central pit depth and diameter to crater depth and diameter ratios. The relationships derived for the CO_2 ice experiments are compared to those for H_2O ice, or other materials, if available. For five shots (three CO_2 targets and two H_2O targets), a statistical analysis of crater ejecta has been performed. Finally, some conclusions concerning the cratering of Solar System icy bodies are presented, on the basis of extrapolation of our results as well as on the cratering record observed on these bodies.
Brooke-Thomas W.
Burchell Mark J.
Leliwa-Kopystyński Jacek
Zarnecki John C.
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