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  • ASTROPHYSICS  (3)
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  • 1
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    C2, CN and dust in Comet Wilson (1987VII) (1993)
    In:  Other Sources
    Details
    Publication Date: 2019-01-25
    Description: Column density profiles in C2 and CN as well as in blue and red continuum (BC and RC) were constructed from two dimensional images of the coma of Comet Wilson (1987VII). The authors' analysis showed that the continuum profiles decrease with the nuclear distance rho as 1/rho. From the C2 and CN profiles the authors determined the parent and the daughter lifetimes as well as the production rates in terms of the vectorial model.
    Keywords: ASTROPHYSICS
    Type: Lunar and Planetary Inst., Twenty-Fourth Lunar and Planetary Science Conference. Part 3: N-Z; p 1261-1262
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Gas and dust in some recent periodic comets (1979)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Results are presented for narrow-band photometry of four recent periodic comets. The observed fluxes are used to estimate carbon radical production rates, gas-to-dust ratios, and the colors of the dust grains. It is found that in most respects the periodic comets exhibit the same range of properties typical of parabolic comets. Comet P/Chernykh is one of the dustiest comets on record, and its dust is physically different from that of the other comets considered. A correlation between the gas-to-dust ratio and the color of the grains is tentatively proposed. The need for homogeneous data on a large number of comets is emphasized.
    Keywords: ASTROPHYSICS
    Type: Astronomical Journal; 84; Apr. 197
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Photometric observations of comet P/Giacobini-Zinner (1987)
    In:  Other Sources
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    Publication Date: 2019-07-12
    Description: Narrow-band filter photometry of comet P/Giacobini-Zinner was obtained on 15 nights at Lowell Observatory in the interval from June 15 to Nov. 20, 1985. The emission bands of OH, NH, CN, C3, and C2 were isolated, along with continuum points at 3650 A and 4845 A. All observed species showed pronounced asymmetry about perihelion, with preperihelion abundances being greater by more than a factor of 2 than postperihelion abundances over the heliocentric distance range of 1.0-1.5 AU. The characteristics of the asymmetry were significantly different than observed in previous apparitions, with the peak production rates occurring in late July/early August. The unusually low C2/CN abundance ratio seen in previous apparitions is confirmed by the present observations. Furthermore, the QH data demonstrate that the C2 in Giacobini-Zinner (along with C3 and NH) is depleted when compared to water (the dominant species), rather than CN being unusually over abundant.
    Keywords: ASTROPHYSICS
    Type: Astronomy and Astrophysics (ISSN 0004-6361); 187; 1-2
    Format: text
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    NASA TECHNICAL REPORTS
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