CAOSP abstracts, Volume: 34, No.: 2, year: 2004
- Author(s): Neslušan, L.; Jakubík, M.
- Journal: Contributions of the Astronomical Observatory Skalnaté Pleso, vol. 34, no. 2, p. 87-104.
- Date: 06/2004
- Title: The tidal action of the homogeneous field of Galactic-disc matter and population of the outer Oort cloud
- Keyword(s): comets, cosmogony, celestial mechanics
- Pages: 87 -- 104
The dynamical evolution of the comets in the Oort comet cloud under the
exclusive perturbation by the dominant term of the Galactic tide is studied.
The purpose of this work is mapping the major effects caused by the outer
perturber of the cloud and sketching a new procedure to estimate the population
of the outer part of the cloud. Though the analysis of the dominant term can
say a lot of a general concept of the dynamics of bodies in the cloud, it is
found that other outer perturbers have to be taken into account when we deal
with bringing the cometary perihelia into the planetary region. Even some
subtle effects appear to be very important in this respect. If only a single
main term of the Galactic tide is considered, then only
≈ 0.6 × 1011 outer-Oort-cloud comets, with minimum perihelia
within the libration cycle below 35 AU, appear to be sufficient to explain
the current flux of new comets into the planetary region. The real population
of the entire outer cloud is, however, expected to be more numerous.
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