Physics
Scientific paper
Sep 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987esasp.278..447k&link_type=abstract
In ESA, Proceedings of the International Symposium on the Diversity and Similarity of Comets p 447-454 (SEE N88-21884 14-91)
Physics
5
Comet Nuclei, Halley'S Comet, Surface Properties, Crusts, Giotto Mission, Ice, Size Determination, Spaceborne Photography, Sublimation, Vega Project
Scientific paper
Comet nuclei, and particularly Giotto Halley Multicolor Camera (HMC) studies, are reviewed. The size of the nucleus of Comet Halley is considerably larger than required for the observed gas and dust production by unrestricted sublimation of water ice. The question whether the crust or mantle that covers large portions of the nucleus and prevents sublimation of the ice underneath is cohesive or regolith remains open. At least in one incidence, the VEGA-2 images reveal minor activity originating from the night side of the nucleus. On HMC images, there are five dust filaments pointing into the antisunward hemisphere. However they could be from the evening side of the nucleus. The sublimation leads to erosion of the surface. About 6 m of the active surface is lost during revolution. The mass of the nucleus derived from the nongravitational forces (10 to the 14th power kg) combined with its large volume leads to a very small density of 0.2 g/cc.
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