Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987esasp.278..315s&link_type=abstract
In ESA, Proceedings of the International Symposium on the Diversity and Similarity of Comets p 315-322 (SEE N88-21884 14-91)
Astronomy and Astrophysics
Astronomy
36
Anisotropy, Comet Nuclei, Cosmic Dust, Gas Jets, Outgassing, Astronomical Models, Imaging Techniques, Rotation
Scientific paper
Jets and fans of dust ejected from discrete emission sources on the sunlit side of comet nuclei were studied. Computer-generated images of these features illustrate the diversity of patterns that can be explained by varying the position of the spin axis, rotation period, location and extent of the active area, and the ejecta's dynamical constants for a given Sun-Earth-comet geometry. It is shown that an emission fan is generated by rotation of a high-latitude source about the spin axis of the nucleus with a relatively high obliquity, but that the fan's formation is rather insensitive to the rotation period. It appears that at least for comets with perihelia well outside the Earth's orbit, the position angle of a fan's observed axis virtually coincides with the projected direction of the spin axis, thus constraining the spatial orientation of the latter.
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