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Variation of Nongravitational Parameters for Comet Encke as a Result of its Decay

M. G. Ishmukhametova, E. D. Kondrat'eva, V. S. Usanin.

Protecting the Earth against Collisions with Asteroids and Comet Nuclei, In: A. M. Finkelstein, W. F. Huebner, V. A. Shor (Eds) Proceedings of the International Conference “Asteroid-Comet Hazard-2009”, StP: Nauka, 139–145 (2010)

Ключевые слова: Very Long Baseline Interferometry (VLBI), Near Earth Objects (NEOs), comet Encke, variations of nongravitational parameters, Marsden's model, secular decay, deposition of a substantial nonvolatile mass, to imped the sublimation, a little-massive mantle, to shrink the effective area linearly, to shrink the area exponentially, adequacy of models

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An assumption is made that variations of nongravitational parameters of comet Encke in Marsden's model are caused by its secular decay. To account for decrease of nongravitational parame-ters three variants of physical processes are proposed: 1) deposition of a substantial nonvolatile mass not impeding the sublimation; 2) generation of a little-massive mantle shrinking the effective area linearly; 3) generation of a little-massive mantle shrinking the area exponentially. The corresponding equations are derived. The adequa-cy of the first two models over more than 150 years is shown