Titlebook: Comets in the Post-Halley Era; In Part Based on Rev R. L. Newburn,M. Neugebauer,J. Rahe Book 1991 Springer Science+Business Media Dordrecht

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Carbonaceous Compounds in Comets: Infrared Observations. Gaseous and solid compounds were also observed with infrared spectroscopy, which gave detections of CO and CO., probable detections or upper limits of H.CO and CH4, and a tentative detection of OCS. The CH./CO ratio of less than unity in Comet Halley points to a CO-rich solar nebula; however, the

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Ultraviolet Spectroscopy of Cometary Comaectra of these comets appear to be similar, with OH and H produced by the photodis-sociation of water being the dominant species and emissions of C, O, S, CS and CO.. usually present. Although signs of variability of many kinds in comet spectra appear, the evidence from the ultraviolet observations s

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Physical Properties of Frozen Volatiles—Their Relevance to the Study of Comet Nucleition of cometary nuclei. Based on recent laboratory studies performed by several groups, an overview is given of the properties of various ices condensed at low temperatures and of their evolution during heating up to a temperature of about 200 K, typical of the perihelion temperature of a comet suc

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Laboratory Simulation of Cometary Processes: Results From First Kosi Experiments emitted gas and dust. The relation between these measurements and properties of and processes on the nucleus is established by theoretical modelling, while laboratory experiments may provide some of the physical parameters needed. In addition, laboratory tests can stimulate new ideas for processes

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Laboratory Simulation of Cometary Structuresin the nucleus have been studied by laboratory simulation experiments. A nucleus model of H.O ice with the impurity of graphite particles has been shown to display the same temperature and surface albedo as those determined for Comet Halley’s nucleus by the VEGA 1, VEGA 2, and Giotto spacecraft. The

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