Physics
Scientific paper
Apr 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991icar...90..319l&link_type=abstract
Icarus (ISSN 0019-1035), vol. 90, April 1991, p. 319-325.
Physics
16
Comet Nuclei, Ice, Interplanetary Dust, Particle Size Distribution, Surface Layers, Black Body Radiation, Solar Radiation, Sublimation, Ultraviolet Radiation, Comets, Heating, Evaporation, Ice, Particles, Models, Size, Radius, Temperature, Sublimation, Timescale, Vapor Pressure, Contamination, Calculations, Grains, Evolution, Ultraviolet, Flux, Parameters
Scientific paper
A cometary nucleus which is modeled as a porous and fragile ice/dust mixture could emit metric-to-submicrometric ice particles that are subsequently blown off the cometary surface by sublimating gases. The 'history' of ice particles with radii of up to 100 microns is presently calculated for both pure-ice particles and particles polluted by a dark nonvolatile material. The sublimation minimum obtained by Patashnik and Rupprecht (1975) for pure ice particles of about 20 microns is confirmed, but even traces of ice pollution is noted to lead to much shorter particle lifetimes; the use of different ice vapor-pressure formulas extant in the literature, moreover, is found to affect lifetime calculations by an order of magnitude.
Kömle Norbert I.
Lichtenegger Herbert I. M.
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