Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986aj.....91..422s&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 91, Feb. 1986, p. 422-431. NASA-supported research.
Astronomy and Astrophysics
Astronomy
12
Astronomical Models, Encke Comet, Gravitational Effects, Precession, Comet Nuclei, Hydrogen, Hydroxyl Emission, Light Curve, Outgassing, Perihelions, Water
Scientific paper
The precession model for P/Encke formulated by Whipple and Sekanina (1979) is re-examined in the light of the recent measurements of the OH and H production rates, which according to A'Hearn et al. (1985) indicate that the comet's visual light curve cannot be employed to approximate the variations with time in the nongravitational force that is being exerted on the nucleus by the comet's outgassing. The optimized precession solution derived here with the use of the A'Hearn et al. production law is shown to require unacceptably small nucleus dimensions and to offer an inferior fit to observed variations in the orientation of the comet's preperihelion fan-shaped coma. It is concluded that the Whipple-Sekanina model remains the best available precession solution for this comet.
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