Other
Scientific paper
Oct 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988aj.....96.1455s&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 96, Oct. 1988, p. 1455-1475.
Other
36
Comet Nuclei, Comet Tails, Encke Comet, Outgassing, Gravitational Effects, Morphology
Scientific paper
The concept of a continual or quasicontinual production of ejecta from a discrete emission source (vent) on the northern hemisphere of P/Encke's rotating nucleus was proposed in a recent study (Sekanina, 1988) to account for the emission fan observed before perihelion and for the comet's activity at large heliocentric distances, including the perihelion region. This vent was estimated to have an effective water-sublimation area of 0.4 km2 and its ejection vector to make an angle of about 35° with the spin axis. Paper I (45.103.132) was only involved with the apparitions 1924 - 1984. It is clearly desirable to extend the period of investigation further into the past to learn more about the comet's rotation, activity, and other aspects of physical behavior. This study concentrates on the period of time from 1868 until 1918, with a brief mention of the 1921 apparition.
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