Other
Scientific paper
Sep 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008dps....40.2811c&link_type=abstract
American Astronomical Society, DPS meeting #40, #28.11; Bulletin of the American Astronomical Society, Vol. 40, p.438
Other
Scientific paper
Evidence of the role of impact in sculpting the histories of asteroids and other small bodies in the solar system mounts as each new object is examined by spacecraft. Not only have these objects attained their current dimensions by collisional disruption of larger bodies, but the majority of their subsequent evolution also can be attributed to impact. This investigation simulates the effects that hypervelocity impact may have on the asteroid regolith by exploring first the effect on terrestrial samples. South African Bushveldt Gabbro, a reasonable planetary analogue, was sieved to include grain sizes between 125 and 250 µm contained in a polyethylene holder and retained by a thin, microscope-slide cover; and impacted by a ceramic sphere (3.18-mm in diameter) at 5.7 km/s. The light-gas gun chamber and area up range of the target were lined with aluminum foil to collect ejecta. After the shot, all material was collected from the chamber. The spectra were measured at RELAB using the Bi-directional spectrometer (0.32 - 2.6 µm). Among the initial results are distinct changes in spectral slopes in the visible wavelengths from 0.4 to 0.7 microns, and reddening in the near-infrared from 1.1 to 2.5 microns. Absorption bands at 1 and 2 microns were not observed to change as a result of impact.
Cintala Mark J.
Clark Beth Ellen
Ockert-Bell Maureen
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