Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989em%26p...47..231s&link_type=abstract
Earth, Moon, and Planets (ISSN 0167-9295), vol. 47, Dec. 1989, p. 231-239.
Astronomy and Astrophysics
Astronomy
2
Astronomical Photometry, Chemical Composition, Comet Nuclei, Emission Spectra, Spectrophotometry, Carbon, Cn Emission, Cosmic Dust, Hydrogen, Hydroxyl Emission, Iue, Solar Orbits
Scientific paper
Postperihelion observed emission fluxes at 388 nm (CN) and 516 nm (C2) of the coma of Comets Austin (1982g) and Bradfield (1980t) are analyzed in the framework of the Haser model. Ratios of Haser model CN and C2 parent production rates with expansion velocity show that each comet behaves normally. For an assumed 20-percent activity of the total spherical surface area of the nucleus, the water-vaporization theory coupled with derived water production rates from IUE H and OH flux data yields a nuclear diameter of about 6 km for Comet Austin (1982g). For Comet Bradfield (1980t), the derived nuclear diameter is expected to be of about 1 km.
Roberty Heloisa M. B.
Singh Patan D.
Sinha Kaneenika
Tripathi Bhuwan Mohan
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