Computer Science
Scientific paper
Mar 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008sptz.prop50650a&link_type=abstract
Spitzer Proposal ID #50650
Computer Science
Scientific paper
We propose to observe the coma and specific sections of the dust trail of Rosetta target comet 67P/Churyumov-Gerasimenko (CG) using MIPS Photometry mode at 24 and 70 micron under two different viewing geometries (visibility windows in June/July 2008 and November 2008 to January 2009). Dust trails consist of mm-cm sized particles that trace out a portion of their parent comet's orbit and comprise a record of the continuous history of emission of these large particles. The proposed observations will extend earlier Spitzer programs on the CG dust trail (PIDs 210 and 20235) to the 70 micron range, rendering the first two-colour data of a cometary dust trail since IRAS. They will also provide the first mid-infrared images of the coma and young tail of comet CG. They will allow us to derive the temperature of the trail particles under two different insolation angles and thereby to probe if these particles are able to sustain a temperature gradient, which will provide information on their porosity and heat conductivity. The measured surface brightness of the trail as a function of distance from the nucleus and time will - together with the temperature information - allow us to refine our existing models of the emission history and dynamical properties (sensitivity to radiation pressure) of the grains. The modelling results will be used to predict the large particle environment that Rosetta will face on approach to the comet and during operations. Complementary to modelling of the dust trail, the production of large particles will be directly observable in the developing coma of the comet that during Cycle 5 approaches its perihelion in February 2009.
Agarwal Jessica
Gruen Eberhard
Reach William
Stansberry John
Sykes Mark
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