Physics
Scientific paper
May 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007sptz.prop..294w&link_type=abstract
Spitzer Proposal ID #294
Physics
Scientific paper
The Rosetta Mission spacecraft and its lander will rendezvous with Jupiter Family comet 67P/Churymov-Gerasimenko (67P) in 2014 near 5 AU when the comet is inbound on its orbital trajectory toward perihelion. Only by obtaining Spitzer phased light curves at 8 microns and 24 microns can we tightly constrain the longitudinally-dependent projected nuclear size, because with 2 wavelengths the effects on the IR flux of color temperature and nuclear size can be separated. This proposed light curves of comet 67P are critical to the potential success of the Rosetta mission, as they enable (1) tightening of the constraints on basic nucleus properties, specifically, the nuclear size (projected onto the sky plane) versus rotational phase angle, and (2) measurement of the dust production rate and activity level of 67P within the heliocentric distance range spanned by the 2014 Rosetta encounter and Philae lander. Furthermore, the first simultaneous Spitzer and R-band light curves are to be obtained through our approved ESO VLT program, which allows the first observationally constrained longitudinally-dependent albedo determinations for comet 67Ps nucleus.
Boehnhardt Hermann
Harker David
Kelley Michael
Tubiana Cecilia
Wooden Diane
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