Titlebook: Composition and Origin of Cometary Materials; Proceedings of an IS K. Altwegg,P. Ehrenfreund,W. F. Huebner Conference proceedings 1999 Spri

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Composition of the Volatile Material in Halley’s Coma from in Situ Measurementsls, namely CH., seems to be present as such in the cometary ice..As an outlook to the future we present a list of open questions concerning cometary volatiles and a short preview on the next generation of mass spectrometers that are being built for the International Rosetta Mission to explore the co

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Hale-Bopp and Its Sodium Tailses lower. Spectroscopic observations have been performed on the dust tail, at different beta values, and along the narrow sodium tail showing that the sodium emissions had very different line profiles. The analysis of these profiles will yield important insights into the sources in the inner coma an

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Rocky Cometary Particulates: Their Elemental, Isotopic and Mineralogical Ingredientse mineralogy of cometary dust can be obtained. Cluster analysis revealed certain groups that partly match the classifications of stratospheric interplanetary dust particles. About half of Halley’s analyzed particles are characterized by anhydrous Fe-poor Mg-silicates, Fesulfides, and rarely Fe metal

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On the Flux of Water and Minor Volatiles from the Surface of Comet Nucleirs. From the calculations we obtain temperature profiles and changes in relative chemical abundances, porosity and pore size distribution as a function of depth, and the gas flux into the interior and into the atmosphere for each of the volatiles at various positions of the body in its orbit..In thi