Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981kosis..19..749d&link_type=abstract
Kosmicheskie Issledovaniia, vol. 19, Sept.-Oct. 1981, p. 749-762. In Russian.
Astronomy and Astrophysics
Astronomy
Astronomical Models, Comets, Comet Nuclei, Evolution (Development), Fragments, Gravitational Effects, Ice, Mathematical Models, Planets
Scientific paper
The hypothesis that there may exist large cometary bodies with radii of at least several tens of kilometers is set forth. It is shown that the cometary activity of sufficiently massive nuclei may be blocked by self-gravitation through the accumulation of a global layer of dust on the surface. Attention is given to the destruction of the thermally protective shell and even the fragmentation of ice bodies under the effect of tidal forces during close flybys past giant planets. Mathematical modeling of a flyby past Neptune shows that the tidal fragmentation may occur in three ways: (1) short-term fragmentation with subsequent recombination of the fragments; (2) the formation of a compact rotating swarm of bodies, gravitationally connected; and (3) the separation of the highly gravitating ice body into a multitude of independent self-gravitating nuclei. The first variant is found to be the most probable.
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