Statistics – Computation
Scientific paper
Dec 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977sci...198.1249o&link_type=abstract
Science, vol. 198, Dec. 23, 1977, p. 1249-1251.
Statistics
Computation
24
Ejection, Energy Transfer, Escape Velocity, Meteorite Collisions, Planetary Evolution, Anorthosite, Gabbro, Iron, Kinetic Energy, Planetary Gravitation
Scientific paper
The amounts of material and energy which escape a planet in a meteorite impact event is calculated as functions of impact and escape velocities. Results are obtained from the computed flow induced by the impact of iron and gabbroic anorthosite spheres onto a half-space of anorthosite at impact velocities of 5 to 45 km/sec. The impact-induced flows were determined by a numerical method using the mass, momentum, and energy conservation relations in finite-difference approximation, within an Eulerian computational grid. The impact velocities at which ejecta losses equal meteorite mass gains are found to be approximately 20, 35, and 45 km/sec for anorthosite objects and approximately 25, 35, and 40 km/sec for iron objects striking anorthosite surfaces for the gravity fields of the moon, Mercury and Mars.
Ahrens Thomas J.
Okeefe John D.
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