Abstract
view Abstract Citations (12) References (20) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Effects of the law for nongravitational forces on the precession model of comet Encke Sekanina, Z. Abstract 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. Publication: The Astronomical Journal Pub Date: February 1986 DOI: 10.1086/114022 Bibcode: 1986AJ.....91..422S Keywords: Astronomical Models; Encke Comet; Gravitational Effects; Precession; Comet Nuclei; Hydrogen; Hydroxyl Emission; Light Curve; Outgassing; Perihelions; Water; Astrophysics full text sources ADS |
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