Abundances in Comet Halley at the time of the spacecraft encounters

Details Abundances in Comet Halley at the time of the spacecraft encounters Abundances in Comet Halley at the time of the spacecraft encounters

Feb 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...325..927w&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 325, Feb. 15, 1988, p. 927-938.

Astronomy and Astrophysics

Astrophysics

45

Abundance, Brightness Distribution, Cometary Atmospheres, Flyby Missions, Halley'S Comet, Spectrophotometry, Accretion Disks, Chemical Composition, Spatial Distribution, Comets, Halley, Abundance, Spectrophotometry, Spectra, Calculations, C2 Radical, Nh2 Radical, Ch Radical, Parent Molecules, Surface, Origin, Brightness, Comet Tails, Models, Decay, Distribution, Production Rates, Neutral Particles, Comet Nuclei, Flux, Photodissociation, Sublimation, Formation, Source, Comparisons, Earth-Based Observations

Scientific paper

Spectrophotometric observations of Comet Halley obtained in March 1986 at the time of the spacecraft encounters with the comet are described, and the column densities derived from the integrated emission band fluxes are presented. The scale lengths are determined from the spatial profiles of the observed species. Production rates are derived and the parent identities and abundance ratios of the studied species are discussed. The data indicate that the abundance of the primordial condensate NH3 comprises about 0.2 percent of the total volatile fraction of the comet nucleus. The ratio of production rates Q(NH2)/Q(H2O) = 0.003 indicates that Q(NH3)/Q(H2O) is roughly 0.3 percent, which is nearly 10 times lower than the value determined from Giotto ion mass spectrometer data. The production rate Q(CH)/Q(H2O) of 0.007 and the CH spatial profile indicate that CH cannot derive entirely from direct photodissociation of CH4.

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