Computer Science
Scientific paper
Jan 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986icar...65...13h&link_type=abstract
Icarus (ISSN 0019-1035), vol. 65, Jan. 1986, p. 13-26.
Computer Science
145
Comets, Gravitational Fields, Hydrogen Clouds, Milky Way Galaxy, Oort Cloud, Orbit Calculation, Angular Momentum, Orbital Elements, Tides, Comets, Source, Tidal Effects, Gravity Effects, Perturbations, Analysis, Dynamics, Orbits, Angular Momentum, Evolution, Oort Cloud, Calculations, Motion, Celestial Mechanics, Interactions
Scientific paper
The effect that the Galactic disk potential has on the Oort cloud is investigated, and it is found that a drift in cometary angular momentum (J) is produced by the disk's tidal force. If J is reduced below a critical value, the comet enters the planetary system, and is subsequently lost from the Oort cloud to either an escape orbit or a more tightly bound orbit. The rate of Galactic tide-induced orbit evolution is determined through analysis of the orbit averaged Hamiltonian. The loss rate is also calculated and compared to that induced by stellar encounters. It is found that when the loss cylinder is empty, the loss rate of comets from the Oort cloud, due to the Galactic tide, is larger than the loss rate due to stellar perturbations by a factor ranging between 1.5 and 2. It is proposed that the Galactic tide is the dominant cause of orbital evolution in the Oort cloud.
Heisler James
Tremaine Scott
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