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  • 1
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    The 0.9-2.5 micron spectrum of Comet West 1976 VI (1983)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Analyses of IR data of Comet West in the region 0.9-2.5 microns are presented. The spectra were observed with a resolution of 4.6/cm, and the solar-type star Eta Boo was also observed for comparison purposes. The cometary continuum was found to increase slightly from 10,000-5500/cm, and display thermal emission above 5500/cm due to dust particles in the coma. The cometary emissions were identified with CN and C2, with the C2 transitions displaying unblended singlet and triplet systems. It is noted that no emissions or absorptions due to ice of any form were detected.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal, Part 1 (ISSN 0004-637X); 270; July 15
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    CCD observations of comet Tuttle 1980 XIII - The H2O(+) ionosphere (1985)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: A CCD spectrum of comet Tuttle 1980h has been analyzed with emphasis on the emission of H2O(+) ions. The fine angular resolution (1.5 arcsec) and the capability of absolute brightness calibration of the CCD instrument made it possible to determine the spatial concentration of the H2O(+) ions of this faint comet and the total number of these ions confined within a spherical region. Solar photoionization of the H2O atmosphere can account for the production of the H2O(+) ions observed in the confined region. The dimension of the H2O(+) ionosphere at the time of observation was found to be comparatively small, implying the possible existence of an ionopause sharply delineating the extension of the cometary ionosphere.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal, Part 1 (ISSN 0004-637X); 293; 609-615
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Luminosity and spatial distribution of the forbidden O I 6300-A emission in comets (1984)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The Tuttle, Stephan-Oterna, and Brooks 2 comets have been subjected to CCD observations of the 6300 and 6364 A forbidden oxygen lines, in order to determine the spatial profiles and absolute luminosities of the cometary forbidden O I lines. Analysis indicates the source of the observed O I photons to be direct photodissociation of water vapor. O 1D production by dissociation of OH becomes dominant at larger distances from the nucleus, and the water vapor production rates derived from O I emissions are found to be in good agreement with those determined from forbidden line OH by the IUE spacecraft, as well as ground-based photometry. It is demonstrated that analysis of cometary O 1D emission allows the determination of the spatial distribution of the parent molecule water vapor.
    Keywords: ASTROPHYSICS
    Type: Astronomical Journal (ISSN 0004-6256); 89; 1565-157
    Format: text
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    NASA TECHNICAL REPORTS
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