Computer Science
Scientific paper
Jun 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982stin...8314044h&link_type=abstract
Unknown
Computer Science
Chemical Composition, Chemical Reactions, Computer Programs, Computerized Simulation, Halley'S Comet, Albedo, Gas Mixtures, Perihelions, Solar Radiation, Time Dependence, Ultraviolet Radiation, Visibility
Scientific paper
To aid in defining a mission to comet P/Halley, its inner coma is simulation by a computer program that models time dependent chemical reactions in a radially and isentropically expanding gas, taking into account attenuation of solar ultraviolet radiation in the subsolar direction. Column density predictions are based on intelligently selected combinations of poorly known values for nucleus parameters that include size, visual albedo, and infrared emissivity. Only one chemical composition and a minor modification of it are considered here; the dust-to-gas ratio in this model is zero. Although the somewhat optimistically volatile composition chosen here favors a smaller nucleus, a mean nuclear radius of only 0.5 km is unlikely. No significant increase of molecular column density is predicted by this model as a spacecraft approaches, once it is less than a few 10(4) km from the nucleus. Predictions are made for various heliocentric distances of interest for comet missions and for ground observations.
Fikani M. M.
Huebner Walter F.
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