Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987s%26t....73..246k&link_type=abstract
Sky and Telescope (ISSN 0037-6604), vol. 73, March 1987, p. 246-250.
Astronomy and Astrophysics
Astronomy
Abundance, Astronomical Spectroscopy, Cometary Atmospheres, Halley'S Comet, Comet Nuclei, Giotto Mission, Plasma Jets, Solar System, Vega Project, Comets, Halley, Composition, Dust, Comae, Photographs, Wavelengths, Infrared, Spectra, Spacecraft Observations, Earth-Based Observations, Telescope Methods, Giotto, Vega Missions, Mass Spectrometry, Chemistry, Abundance, Size, Mass, Photometry, Gases, Comet Nuclei, Isotopes, Kao Aircraft, Aircraft Observations, Emissions, Water, Cyanogen, Ice, Parent Molecules, M
Scientific paper
The composition of the clouds around Comet Halley during its perihelion passage was examined using intercept spacecraft, IUE, ICE and Pioneer Venus spacecraft, and ground-based instruments. Spectral data showed that the dust emitted in jets was mainly carbon, hydrogen, oxygen and nitrogen (CHON), with additives of Fe, Si, and Mg. The C abundance is similar to that in the sun and in the galactic stellar abundances, which supports the model of comets as proto-stellar nebula material. The nucleus was observed to shed 16 tons of water per second, a rate which at times may have doubled. Noticeably absent from the spectra were CH4 lines, an absence common in interstellar clouds. The possibilities that the comet contains a large deuterium-hydrogen ratio and carbonaceous material are discussed.
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