Galactic perturbations on nearly-parabolic cometary orbits

Details Galactic perturbations on nearly-parabolic cometary orbits Galactic perturbations on nearly-parabolic cometary orbits

Oct 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983m%26p....29..121b&link_type=abstract

Moon and the Planets (ISSN 0165-0807), vol. 29, Oct. 1983, p. 121-137.

Physics

42

Comets, Galaxies, Orbit Calculation, Orbit Perturbation, Solar Orbits, Numerical Integration, Orbital Elements

Scientific paper

The effect of galactic perturbations on long-period comet orbits is examined via numerical and analytical means. Relations are found between a comet's initial perihelion position and the positions of succeeding perihelia. It was found that the galactic effects were strongest on the comets initially at galactic latitudes close to 40 deg. In such cases the galactic perturbations caused the orbit to become almost circular before becoming nearly parabolic again. This effect allows comets with semi-major axes of about 25,000 AU to make only a few passages through the inner solar system in a time interval of 1 Gyr. Thus the galactic field is an important factor in the evolution of long-period comet orbits. The observed distribution of perihelia of long-period comets indicates that galactic effects have been active.

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