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  • Other Sources  (2)
  • 2015-2019
  • 1995-1999
  • 1985-1989  (2)
  • 1980-1984
  • 1987  (2)
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  • 2015-2019
  • 1995-1999
  • 1985-1989  (2)
  • 1980-1984
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  • 1
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    Search for molecules in Comet Halley at millimeter wavelengths (1987)
    In:  Other Sources
    Details
    Publication Date: 2019-07-27
    Description: Data collected with the Five College Radio Astronomy Observatory 13.7-m radio telescope are used to search for the possible CN parent molecules HNC, HC3N, and CH3CN in Comet Halley at millimeter wavelengths. Maximum relative abundances for HNC/HCN of 0.3, for HC3N/HCN of 0.4, and for CH3CN/HCN of 0.8 are obtained, showing that these three molecules are not a major source of the CN radical observed in optical and UV spectroscopy. Upper limits to the beam averaged column densities and production rates of these molecules are determined (in addition to an upper limit for the beam averaged column density for the formyl ion of less than 10 to the 11th/sq cm), providing important constraints for chemical models of the coma.
    Keywords: ASTROPHYSICS
    Type: Cometary radio astronomy; Sept. 24-26, 1986; Green Bank, WV; United States
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Observations of HCN in Comet Halley (1987)
    In:  Other Sources
    Details
    Publication Date: 2019-07-27
    Description: Observations of the HCN J = 1-0 rotational transition at 3.4 mm wavelength in comet P/Halley are discussed. The data were obtained during a total of 56 individual observing sessions between Nov. 18, 1985 and May 11, 1986, and represent the first time that a cometary parent molecule has been so extensively monitored. The HCN production rate is well correlated with the total visual magnitude of the comet, indicating that HCN follows the overall gas production. There is also evidence of time variability and variations in the HCN hyperfine ratios from their LTE values. Spectra obtained by binning the HCN data with heliocentric distance show that the HCN line width, and thus the parent outflow velocity, increases with decreasing heliocentric distance.
    Keywords: ASTROPHYSICS
    Type: Cometary radio astronomy; Sept. 24-26, 1986; Green Bank, WV; United States
    Format: text
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    NASA TECHNICAL REPORTS
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