Evolution Of The Dust And Water Ice Plume Components As Observed By The Lcross Visible Camera And Uv-visible Spectrometer

Details Evolution Of The Dust And Water Ice Plume Components As Observed By The Lcross Visible Camera And Uv-visible Spectrometer Evolution Of The Dust And Water Ice Plume Components As Observed By The Lcross Visible Camera And Uv-visible Spectrometer

Oct 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010dps....42.1803h&link_type=abstract

American Astronomical Society, DPS meeting #42, #18.03; Bulletin of the American Astronomical Society, Vol. 42, p.979

Astronomy and Astrophysics

Astronomy

Scientific paper

LCROSS (Lunar Crater Observation and Sensing Satellite) impacted the Cabeus Crater and created an impact plume that was observed by the LCROSS Shepherding Spacecraft. Here we analyze data from the ultraviolet-visible spectrometer and visible context camera aboard the Spacecraft. We then use this data to constrain a numerical model to understand the physical evolution of the plume. Constraining the modeling results with Spacecraft observations, we conclude that lofted dust grains remained suspended above the lunar surface for the entire 250 seconds of observation after impact. The impact plume was composed of both a high angle and low angle plume component. Dust particle sizes lofted above the lunar surface were micron to sub-micron in size. Water ice particles were also contained within the ejecta cloud and simultaneously photo-dissociated and sublimated after reaching sunlight. Purity levels of the ice suggest a degree of comingling of ice and regolith grains within the permanently shadowed crater. This paper will present the observational data from the Spacecraft observations, detail the modeling efforts, and discuss our current understanding the impact plume evolution.

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