Julien Laurent-Varin, Théo James, Jean-Charles Marty, Laurent Jorda, Sebastien Le Maistre, Robert Gaskell
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New gravity field of comet 67P/C-G based on Rosetta's Doppler and optical data
We provide a new gravity field of Comet 67P-C/G up to degree 4. We detect
mass heterogeneity in the comet nucleus. The loss of mass is restimated at
0.28\% of the comet's total mass (3 times larger than previous estimate).
Comparison of the gravity field between pre- and post-perihelion allowed us to
measure a shift in the comet's center of gravity of 35 m northward, attributed
to ice sublimation process.
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