On the origin of Comet Encke

Details On the origin of Comet Encke On the origin of Comet Encke

Aug 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996mnras.281..937s&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 281, Issue 3, pp. 937-944.

Astronomy and Astrophysics

Astronomy

10

Methods: Numerical, Celestial Mechanics, Stellar Dynamics, Comets: General, Comets: Individual: Comet Encke, Minor Planets, Asteroids

Scientific paper

Numerical integrations are performed on test-particle orbits similar to those of 2P/Encke and (6063) Jason. For purely gravitational integrations, or integrations with non-gravitational forces applied of a magnitude similar to those currently observed for 2P/Encke, the orbits do not alter substantially, all remaining decoupled from Jupiter. By using non-gravitational forces about four times as strong, which are plausible given 2P/Encke's known history as a prolific producer of meteoroids and dust, it is found that some orbits become Jupiter-crossers. It is not necessary for the non-gravitational forces to be exceptionally strong, nor to act consistently in one direction for an extended period, to produce such a result. Rather, the importance of the non-gravitational forces lies in them causing the semimajor axes of the test orbits to scan across the complex of jovian and saturnian mean motion resonances at 2.3<a<2.9 au, residence in strong resonances leading to enhanced secular orbital changes. By appealing to a reversal of the arrow of time one can then hypothesize that the sub-jovian orbit of 2P/Encke was achieved through the opposite process. This result also has implications for the origin of Apollo-Amor asteroids derived from de-volatilized cometary nuclei.

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