Comet Bowell 1980b

Details Comet Bowell 1980b Comet Bowell 1980b

Apr 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984aj.....89..579a&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 89, April 1984, p. 579-591.

Astronomy and Astrophysics

Astronomy

249

Astronomical Spectroscopy, Comets, Hydroxyl Emission, Ultraviolet Astronomy, Visible Spectrum, Astronomical Photometry, Gas Composition, Oort Cloud, Self Consistent Fields, Solar Orbits, Ultraviolet Spectrophotometers

Scientific paper

The authors have carried out optical filter photometry and optical and ultraviolet spectrophotometry of Comet Bowell over the period November 1980 - June 1982. They have observed emission by OH at heliocentric distances to nearly 5 AU preperihelion with the OH emission implying a production rate which decreased, but with outbursts, as the comet approached perihelion. CN, however, did not appear until the comet was close to perihelion. The grains exhibited a larger back-scattering peak than has been observed in other comets and showed evidence for two populations and outbursts. The reflectivity of the grains was determined from 2600 Å to 2.2 μ and shows steep slopes in two regions, 3200 - 4000 Å and 1.2 - 1.6 μ, with shallower or negligible slopes in other regions. A self-consistent model is developed. All observations are quantitatively consistent with a nucleus of radius several kilometers and a pre-existing halo of grains corresponding to a layer of a few meters if spread on the nucleus.

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