On the origin of Comet Encke

被引:21
作者
Steel, DI
Asher, DJ
机构
[1] ANGLO AUSTRALIAN OBSERV,COONABARABRAN,NSW 2357,AUSTRALIA
[2] ANGLO AUSTRALIAN OBSERV,EPPING,NSW 2121,AUSTRALIA
关键词
methods; numerical; celestial mechanics; stellar dynamics; comets; general; individual; Comet Encke; minor planets; asteroids;
D O I
10.1093/mnras/281.3.937
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
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.
引用
收藏
页码:937 / 944
页数:8
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