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  • 1
    facet.materialart.
    Unknown
    On the temperature and gas composition in the region of comet formation (1989)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: The gas composition and temperature in the region of Comet Halley's formation are estimated on the basis of Giotto and Vega spacecraft results, in conjunction with an experimental study of gas-mixture trapping in amorphous water ice. A CO/CH4 ratio of the order of 100, and temperature about 48 K, are inferred for the case of Halley formation in the solar nebula through water vapor condensation in the presence of gas. This formation temperature, which implies that the ice was in amorphous form, is noted to be close to the temperatures observed in circumstellar dust shells by IRAS; it also lends support to the suggestion that short-period comets were formed outside the planet-formation region.
    Keywords: ASTROPHYSICS
    Type: Icarus (ISSN 0019-1035); 80; 243-253
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
    facet.materialart.
    Unknown
    Gas release from comets (1991)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: The quantities of such volatiles as CO, CO2, and CH4 trapped in cometary water ice are of great importance in the determination of solar nebula temperature and composition in the regions of their formation. Experiments with water ice are presently noted to retain trapped gases beyond the temperature of amorphous ice's transformation to cubic ice; the retention of gases which emerge during the transformation of the cubic form to hexagonal (as well as during evaporation) occurs to a degree that is linearly dependent on the thickness of the ice layer.
    Keywords: ASTROPHYSICS
    Type: Icarus (ISSN 0019-1035); 89; 411-413
    Format: text
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    NASA TECHNICAL REPORTS
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