Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005sptz.prop20235g&link_type=abstract
Spitzer Proposal ID #20235
Astronomy and Astrophysics
Astronomy
Scientific paper
We propose to observe the dust trail of the Rosetta target 67P/Churyumov-Gerasimenko using a series of 24 micron MIPS mapping grids at medium scan speed in order to generate a detailed dust emission model for the comet that will be used to predict the large particle environment that will be faced by Rosetta on approach and during operation. This trail was first detected by the Infrared Astronomical Satellite at far less sensitivity than is afforded by Spitzer. This observation extends the earlier Spitzer COMDUST observation (PI Fazio) of this comet in two important aspects: it quantifies the dust emission at large heliocentric distances which is indicated in the earlier observation, and it extends the characterization of large particles' emissions during previous apparitions of this comet. Dust trails consist of mm-cm size particles that trace out a portion of their parent comet's orbit and comprise a record of the continuous history of emission. We propose to map the trail from 0.2 degrees in the leading direction to 0.6 degrees in the trailing direction. This is more than a factor two larger than the previous image. The forward part of the trail is of particular interest in understanding the size-distribution and emission history of large particles. Making use of the simultaneous (though less complete) scans with the 70 micron array, we will be able to determine variations in particle properties with size. Visibility windows are available in July 2005 and March 2006.
Gruen Eberhard
Lien David
Reach William
Sykes Mark
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