Physics
Scientific paper
Jun 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990icar...85..380e&link_type=abstract
Icarus (ISSN 0019-1035), vol. 85, June 1990, p. 380-393.
Physics
24
Cometary Atmospheres, Cosmochemistry, Halley'S Comet, Solar Corona, Ammonia, Carbon Dioxide, Carbon Monoxide, Methane, Volatility, Comets, Halley, Solar Nebula, Volatiles, Gases, Origin, Formation, Composition, Methane, Carbon Monoxide, Carbon Dioxide, Ammonia, Nitrogen, Water, Chemistry, Depletion, Molecules, Abundance, Thermochemistry, Water Vapor, Kinetics, Quenching, Mixing, Trapping, Water Ice, Drag, Heating, Fractionation, Hypotheses, Mission Planning
Scientific paper
The conditions for Comet Halley formation are presently considered in light of the application of physical and chemical processes in the solar nebula environments to the present data base on the composition of the comet's gases. Key molecular ratios are compared to solar nebula model predictions, and the nebular thermochemistry is quantified for a range of solar elemental compositions which correspond to varying water depletion states in the inner nebula. Assuming that inner nebula chemistry is catalyzed by reaction on grains, it is judged that the abundances of the volatile C species CH4, CO, and CO2 in Halley could have been supplied by the solar nebula.
Engel Sandra
Lewis Scott J.
Lunine Jonathan I.
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