The near-parabolic flux and the origin of short-period comets

Details The near-parabolic flux and the origin of short-period comets The near-parabolic flux and the origin of short-period comets

Nov 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986natur.324..350b&link_type=abstract

Nature (ISSN 0028-0836), vol. 324, Nov. 27, 1986, p. 350-352. SERC-supported research.

Astronomy and Astrophysics

Astronomy

28

Astronomical Models, Comets, Orbital Mechanics, Solar Orbits, Elliptical Orbits, Oort Cloud, Perihelions, Perturbation Theory, Spectral Energy Distribution

Scientific paper

The flux of nearly parabolic cometary orbits from the Oort Cloud, including the recently discovered dominant injection of comets by the Galactic tide, is recalculated. The results show that the observed number of short-period comets may be understood in terms of the capture of Oort Cloud comets by planetary perturbations, provided that the Cloud has a massive inner core and that the injection of new comets is dominated by the Galactic tide. The analysis predicts that most short-period comets are initially captured by Uranus (or possibly Saturn), rather than Jupiter, and that most short-period comet progenitors are injected by the Galactic tide with relatively small semimajor axes close to 5000 AU.

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