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The dust trail of Comet 67P/Churyumov-Gerasimenko between 2004 and 2006
Reach, William T.; Agarwal, Jessica; Grün, Eberhard +3 more
We report on observations of the dust trail of Comet 67P/Churyumov-Gerasimenko (CG) in visible light with the Wide Field Imager at the ESO/MPG 2.2 m telescope at 4.7 AU before aphelion, and at 24µm with the MIPS instrument on board the Spitzer Space Telescope at 5.7 AU both before and after aphelion. The comet did not appear to be active dur…
Shape and obliquity effects on the thermal evolution of the Rosetta target 67P/Churyumov-Gerasimenko cometary nucleus
Lasue, J.; Coradini, A.; De Sanctis, M. C. +3 more
This work is dedicated to the application to 67P/Churyumov-Gerasimenko of a new quasi-3D approach for non-spherically shaped comet nuclei with the aim to interpret the current activity of the comet in terms of initial characteristics and to predict shape and internal stratification evolution of the nucleus. The model is applied to differently shap…
The effect of internal inhomogeneity on the activity of comet nuclei - Application to Comet 67P/Churyumov-Gerasimenko
Rosenberg, Eric D.; Prialnik, Dina
We present thermal evolution calculations of inhomogeneous asymmetric initial configurations of a spherical model of Comet 67P/Churyumov-Gerasimenko, using a fully 3-dimensional numerical code. The initial composition is amorphous H 2O ice and dust, in a "layered-pile" configuration, where layers differing in ice/dust ratio and thermal …
Gas kinetics and dust dynamics in low-density comet comae
Kamp, Lucas; Gulkis, Samuel; Lee, Seungwon +4 more
Extensive regions of low-density cometary comae are characterized by important deviations from the Maxwell-Boltzmann velocity distribution, i.e. breakdown of thermodynamic equilibrium. The consequences of this on the shapes of emission and absorption lines, and for the acceleration of solid bodies due to gas drag, have rarely been investigated. Th…
Low-temperature magnetic properties of iron-bearing sulfides and their contribution to magnetism of cometary bodies
Kohout, Tomáš; Kosterov, Andrei; Haloda, Jakub +2 more
In this study we present a review of low-temperature magnetic properties of alabandite (Fe, Mn)S, daubreelite FeCr 2S 4, pyrrhotite Fe 1-xS and troilite FeS updated with new experimental data. The results indicate that besides FeNi alloys mainly daubreelite with its Curie temperature T C ∼ 150…