On the detectability of icy grains in the comae of comets

Details On the detectability of icy grains in the comae of comets On the detectability of icy grains in the comae of comets

Sep 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981icar...47..342h&link_type=abstract

(International Astronomical Union and American Astronomical Society, Colloquium on Comets: Gases, Ices, Grains, and Plasma, 61st

Astronomy and Astrophysics

Astronomy

99

Comet Nuclei, Evaporation Rate, Ice, Temperature Effects, Grains, Infrared Absorption, Particle Size Distribution, Solar Radiation, Volatility, Comets, Comae, Ice, Grains, Evaporation, Temperatures, Composition, Scattering, Sublimation, Halos, Data, Absorption Bands, Colors

Scientific paper

While there is no direct evidence for the presence of icy grains in cometary comae, they are assumed in order to explain observed phenomena. The evaporation of icy grains over the distance scale of the visible cometary coma sets specific limits on their temperature. Unless the grains are pure water ice, maximum icy grain halo size will be limited to a few hundred km at heliocentric distances not greater than about 2.5 AU. While it is unlikely that the 1.5- or 2.0-micron ice band could be detected in the scattering by icy grains, detection of the 3.0-micron ice band may be possible in comets displaying a coma at large heliocentric distances.

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