Physics
Scientific paper
Dec 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989esasp.302..233b&link_type=abstract
In ESA, Physics and Mechanics of Cometary Materials p 233-236 (SEE N90-19989 12-90)
Physics
Chemical Composition, Cometary Atmospheres, Dust, Halley'S Comet, Comet Nuclei, European Space Programs, Return To Earth Space Flight
Scientific paper
The most detailed information on the elemental and molecular composition of comets was obtained during the 1986 apparition of comet Halley. Although there are uncertainties in the dust/gas ratio and the abundances of several gaseous species, there is a reasonably good understanding of the major composition of the comet. The ice component is dominated by water, and the abundances of CO, H2CO, NH3 and other carbon and nitrogen bearing species are sufficiently low that the carbon and nitrogen are underabundant in the ice relative to solar proportions. These elements are abundant in the dust and it is likely that the cumulative composition of dust plus ice is a reasonably close match to solar abundances for those elements that are carried in compounds that condense at temperatures above 30K.
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