Comparison of active regions on the nucleus of Comet Halley

Details Comparison of active regions on the nucleus of Comet Halley Comparison of active regions on the nucleus of Comet Halley

Sep 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987esasp.278..455r&link_type=abstract

In ESA, Proceedings of the International Symposium on the Diversity and Similarity of Comets p 455-459 (SEE N88-21884 14-91)

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Brightness, Comet Nuclei, Halley'S Comet, Rotation, Albedo, Giotto Mission, Insolation, Solar Radiation

Scientific paper

The images of the nucleus of Comet Halley returned by the Giotto spacecraft reveal a number of active regions on the surface, one of which is near the expected location of the rotation axis. This feature is larger and brighter than other source regions, suggesting that the mechanism which drives this source is also different. At this active region near the rotation pole the Sun is circumpolar for a significant portion of the solar encounter. Continuous solar insolation causes heating of the nucleus to greater depths and results in the unique properties of this source region. For example, the dust scattering in the antisolar regions around the nucleus is less from the polar region than from the region at the sunward end of the nucleus, consistent with spotty ejection of dusty mantle from the sunward tip and widespread activity in the polar region.

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