An idealized short period comet model: Surface insolation, H2O flux, dust flux and mantle evolution

Details An idealized short period comet model: Surface insolation, H2O flux, dust flux and mantle evolution An idealized short period comet model: Surface insolation, H2O flux, dust flux and mantle evolution

Apr 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985pggp.rept...86f&link_type=abstract

In NASA, Washington Repts. of Planetary Geol. and Geophys. Program, 1984 p 86-87 (SEE N85-23474 13-91)

Astronomy and Astrophysics

Astronomy

Astronomical Models, Comet Nuclei, Cometary Atmospheres, Cosmic Dust, Encke Comet, Evolution (Development), Gas Transport, 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 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.

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