Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000cem..conf..167p&link_type=abstract
Catastrophic Events and Mass Extinctions: Impacts and Beyond, p. 167
Astronomy and Astrophysics
Astrophysics
Comets, Solar Orbits, Trajectories, Cometary Collisions, Parabolas
Scientific paper
The paper presents the results of investigation of dynamical behaviour of 102 known SOHO comets, assuming their orbits to be near-parabolic. Their parabolic orbits derived from the coronographs data covering short near perihelion part of the orbits are not precisely determined and it is possible to make assumption about their near parabolic eccentricities. Sungrazing comets discovered from the Earth with better determined orbits support this idea, too. The equation of motion of these bodies were numerically integrated from the epoch March 25, 1991 forward within the interval of 200,000 years, using a dynamical model of the solar system consisting of all planets. The long term numerical integrations of the SOHO comets with the near parabolic eccentricities show periodical changes of their eccentricities, inclinations and perihelion distances. These bodies are dynamically stable at least during the investigated interval. Majority of their revolution around the Sun pass within the space behind the Mars orbit. Some of these bodies come periodically to the Earth vicinity and can be candidates for collisions with the Earth.
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