Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984icar...60..476f&link_type=abstract
Icarus (ISSN 0019-1035), vol. 60, Dec. 1984, p. 476-511.
Astronomy and Astrophysics
Astronomy
195
Astronomical Models, Comet Nuclei, Cometary Atmospheres, Cosmic Dust, Encke Comet, Evolution (Development), Gas Transport, Ice, Insolation, Silicates, Surface Temperature, Water
Scientific paper
The present cometary activity model integrates feedback processes that involve the transport of heat, gas, and dust, as well as dust mantle development, and includes the effects of latitude, rotation, and spin axis orientation. Attention is given to the development, structural change, and distribution of dust mantles and their mutual interaction with ice surface temperature and gas and dust production. The results obtained suggest that an initially homogeneous, short period comet with a cosmic dust-to-water ice ratio, as well as typical orbit, rotation rate, and grain size distribution, would develop only a thin, less than 1 mm cyclic mantle at all points on the nucleus. Most H2O dust histories deduced from brightness data are noted to be in reasonable agreement with the model, allowing for uncertainty in radius and albedo. The exceptional case of Comet Encke is discussed.
Fanale Fraser P.
Salvail James R.
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