Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apj...282..799f&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 282, July 15, 1984, p. 799-802.
Astronomy and Astrophysics
Astronomy
37
Comet Nuclei, Iras-Araki-Alcock Comet, Ultraviolet Astronomy, Iue, Spatial Distribution, Temporal Distribution, Comets, Iras-Araki-Alcock, 1983D, Emissions, Ultraviolet, Wavelengths, Distribution, Iue, International Ultraviolet Explorer, Comet Nuclei, Models, Rotation, Volatiles, Ice, Sulfur, Production Rate
Scientific paper
The spatial distribution and temporal variation of the ultraviolet emissions from comet IRAS-Araki-Alcock 1983d, observed by IUE near closest approach of the comet to the earth, suggest a model for this comet of a rotating cometary nucleus with a nonuniform distribution of volatile ices. The short lifetime of S2 (about 500 s), a species whose presence was first identified in this comet and is presumed to be present generally in the cometary ice, makes S2 a valuable indicator of short-term nuclear activity. In the case of comet 1983d, the S2 production rate decreased by a factor of 10 over a period of 28 hr.
A'Hearn Michael F.
Feldman Paul D.
Millis Robert L.
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