Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990mnras.244..453f&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 244, June 1, 1990, p. 453-457.
Astronomy and Astrophysics
Astronomy
4
Astronomical Photometry, Halley'S Comet, Hydroxyl Emission, Photodissociation, Water, Comet Nuclei, Perihelions, Telescopes, Comets, Halley, Photometry, Hydroxyl, Water, Production Rate, Comae, Molecules, Astronomy, Earth-Based Observations, Theoretical Studies, Photodissociation, Comparisons, Comet Nuclei, Emissions, Anisotropy, Calculations
Scientific paper
Pre-perihelion ground-based observations of Comet P/Halley are used to derive scalelengths and production rates of OH molecules during the period December 7-10, 1985. On the assumption that the photodissociation of H2O molecules occurs within the lifetime measured by spacecraft, the OH daughter has a lifetime agreeing with theoretical calculations and the outflow velocity of H2O from the nucleus was of the order of 1 km/s. The amount of water released from the nucleus was variable by up to 35 percent, with a mean value in agreement with estimates made by other observers at this epoch.
Andrews John P.
Fitzsimmons Alan
Williams Iwan P.
Williams Peter G.
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