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The Dust Grains from 9P/Tempel 1 Before and After the Encounter with Deep Impact
David E. Harker,1*Charles E. Woodward,2Diane H. Wooden3
Gemini-N observed the properties of dust ejected from the nucleusof comet 9P/Tempel 1 before and after its encounter with DeepImpact. Marked changes were seen in the 7.8- to 13-micrometerspectral energy distribution and derived grain properties ofthe inner coma. A strong, broad silicate feature dominated byemission from amorphous pyroxene, amorphous olivine, and magnesium-richcrystalline olivine had developed by 1 hour after impact. Theejected dust mass is 104 to 106 kilograms on the basis of ourmodels. Twenty-six hours later the silicate feature had faded,leaving a smooth featureless spectrum, similar to that observedbefore the impact, suggesting that the impact did not producea new active region releasing small particles on the nucleus.
1 Center for Astrophysics and Space Sciences, University of California, San Diego, 9500 Gilman Drive, Department 0424, La Jolla, CA 92093–0424, USA. 2 Department of Astronomy, University of Minnesota, 116 Church Street, SE, Minneapolis, MN 55455, USA. 3 NASA Ames Research Center, MS 245-3, Moffett Field, CA 94035–1000, USA.
* To whom correspondence should be addressed. E-mail: dharker{at}ucsd.edu
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