Other
Scientific paper
Dec 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984icar...60..455f&link_type=abstract
Icarus (ISSN 0019-1035), vol. 60, Dec. 1984, p. 455-463.
Other
20
Cometary Atmospheres, Encke Comet, Iue, Ultraviolet Spectra, Brightness Distribution, Coma, Comet Nuclei, Gas Composition, Hydroxyl Emission, Ice, Lyman Alpha Radiation
Scientific paper
A comparison of the ultraviolet spectrum of periodic Comet Encke (1980 XI), recorded by the IUE between October 24, and November 5, 1980 with similar spectra, of short- and long-period comets, shows the gaseous composition of P/Encke to be nearly identical to that of the other comets observed by the IUE. If P/Encke is indeed the remains of a once-giant comet, this similarity implies a homogeneous radial structure for the cometary ice nucleus. The OH brightness distribution shows a spatial variation similar to the visible fan-shaped image of the comet, suggestive of a nonuniform distribution of volatile ices on the surface of the nucleus. The total derived water production rate appears to be a factor of 5 higher than that derived from HI Lyman-alpha observations made during the 1970 apparition, and shows a variation with heliocentric distance (r) as r to the -3.3 power over the range 0.81 to 1.02 AU.
Feldman Paul D.
Festou Michael C.
Weaver Harold A.
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