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Plasma environment of a weak comet - Predictions for Comet 67P/Churyumov-Gerasimenko from multifluid-MHD and Hybrid models
Altwegg, K.; Glassmeier, K. -H.; Richter, I. +8 more
The interaction of a comet with the solar wind undergoes various stages as the comet's activity varies along its orbit. For a comet like 67P/Churyumov-Gerasimenko, the target comet of ESA's Rosetta mission, the various features include the formation of a Mach cone, the bow shock, and close to perihelion even a diamagnetic cavity. There are differe…
Temperature dependence of the sublimation rate of water ice: Influence of impurities
Kossacki, Konrad J.; Leliwa-Kopystynski, Jacek
The sublimation rate of ice is commonly calculated using the simple Hertz-Knudsen formula. This formula is derived from the kinetic theory of gases and ignores microphysical processes determining the actual sublimation rate. The microphysical processes can be accounted for by including the temperature dependent sublimation coefficient (Kossacki, K…
How to link the relative abundances of gas species in coma of comets to their initial chemical composition?
Marboeuf, Ulysse; Schmitt, Bernard
Comets are expected to be the most primitive objects in the Solar System. The chemical composition of these objects is frequently assumed to be directly provided by the observations of the abundances of volatile molecules in the coma. The present work aims to determine the relationship between the chemical composition of the coma, the outgassing p…
Minerals detection for hyperspectral images using adapted linear unmixing: LinMin
Schmidt, Frédéric; Legendre, Maxime; Le Mouëlic, Stéphane
Minerals detection over large volume of spectra is the challenge addressed by current hyperspectral imaging spectrometer in Planetary Science. Instruments such OMEGA (Mars Express), CRISM (Mars Reconnaissance Orbiter), M3 (Chandrayaan-1), VIRTIS (Rosetta) and many more, have been producing very large datasets since one decade. We propos…
Sub-millimeter observation of water vapor at 557 GHz in Comet C/2002 T7 (LINEAR)
Choukroun, Mathieu; Janssen, Michael; Keihm, Stephen +9 more
We present sub-millimeter observations of the ground-state rotational transition (110-101) of water vapor from Comet C/2002 T7 (LINEAR) obtained with the MIRO instrument on the ESA Rosetta spacecraft (s/c) orbiter on April 30, 2004. At the time of the observations, the comet was at a distance of 0.63 AU from the Sun, 0.68 AU …