Other
Scientific paper
Dec 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986esasp.250b.409d&link_type=abstract
In ESA Proceedings of the 20th ESLAB Symposium on the Exploration of Halley's Comet. Volume 2: Dust and Nucleus p 409-412 (SEE N
Other
2
Aphelions, Comets, Galactic Structure, Oort Cloud, Orbital Mechanics, Orbits, Gravitational Effects, Interstellar Space, Sun
Scientific paper
The authors found that the aphelia of the 152 known original orbits of the very long period comets (period larger than 10,000 years) are not distributed at random on the celestial sphere, but show three zones of avoidance: namely, one is a strip along the galactic equator and the other two cover the galactic polar caps. Such a symmetry cannot be explained by the traditional mechanism bringing comets into visibility, because this mechanism is based on random stellar passages or (a more recent proposal) on random passages of molecular clouds. Standing in contrast, such a symmetry is predicted by the vertical galactic tide, namely the differential attraction, on the sun and on the comets respectively, coming from the mass of the galactic disk.
Delsemme Armand H.
Patmiou M.
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