Physics
Scientific paper
Oct 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010dps....42.4804s&link_type=abstract
American Astronomical Society, DPS meeting #42, #48.04; Bulletin of the American Astronomical Society, Vol. 42, p.970
Physics
Scientific paper
We are conducting a program of laboratory experiments to study low velocity impacts of 1 to 5 m/s into regolith. We use direct measurement of ejecta mass and high resolution video tracking of ejecta particle trajectories to derive ejecta mass velocity distributions. We wish to characterize and understand the collision parameters that control the outcome of low velocity impacts into regolith, including impact velocity, impactor mass, target size distribution, regolith depth, and target relative density, and to experimentally determine the functional dependencies of the outcomes of low velocity collisions (ejecta mass and ejecta velocities) on the controlling parameters of the collision. Our goal is to understand the physics of ejecta production and regolith compaction in low energy impacts and experimentally validate predictive models for dust flow and deposition. We will present results from our ongoing study showing the positive correlation between impact energy and ejecta mass. Our results show that the ejecta mass fraction decreases as a function of estimated ejecta mass velocity. We will also discuss the effect of pressure, target mass density, target mass type, impactor type, and how these factors may affect our results.
Colwell Josh
Mellon Michael
Seward Laura M.
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