Dynamics of long-period comets

Details Dynamics of long-period comets Dynamics of long-period comets

Apr 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985pggp.rept...89w&link_type=abstract

In NASA, Washington Repts. of Planetary Geol. and Geophys. Program, 1984 p 89-91 (SEE N85-23474 13-91)

Astronomy and Astrophysics

Astronomy

Comet Nuclei, Cometary Atmospheres, Infrared Astronomy Satellite, Interstellar Extinction, Interstellar Matter, Stellar Evolution, Cloud Physics, Companion Stars, Computer Programs, Ice, Nemesis (Star), Oort Cloud, Solar System, Stellar Mass

Scientific paper

Dynamical studies of the origin and evolution of long period comets in the Oort cloud during the past year have concentrated on four areas: (1) interpretation of IRAS observations of dust shells around Vega and some 40 other main sequence stars as evidence for cometary clouds around each of these stars; (2) the dynamical plausibility of an unseen solar companion star orbiting in the Oort cloud and causing periodic cometary showers which result in biological extinction events on the earth; (3) a review of the current hypotheses for cometary formation with particular attention to how each mechanism supplies the required mass of comets to the Oort cloud; and (4) development of new dynamics software to simulate the passage of individual stars directly through the Oort cloud. Each of these efforts is described in detail.

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