The inner Oort cloud and the source of Comet Halley

Details The inner Oort cloud and the source of Comet Halley The inner Oort cloud and the source of Comet Halley

Sep 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988mnras.234..389o&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 234, Sept. 15, 1988, p. 389-399. Research supported by

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4

Gravitational Effects, Halley'S Comet, Hyperbolic Trajectories, Oort Cloud, Orbit Perturbation, Solar Orbits, Jupiter (Planet), Solar System

Scientific paper

Possible routes by which comet P/Halley might have arrived in its present orbit are numerically investigated. Direct insertion to the present orbit as a result of a close encounter with Jupiter by near-parabolic orbits with q = 0.587 AU (the present perihelion distance) or q = 5.2 AU (perihelion near Jupiter) are both unlikely events, requiring a flux of bright comets which is much higher than actually observed. The existence of three other retrograde, intermediate-period comets argues for some systematic process occurring, and it is shown that this may be capture from initially prograde orbits with perihelia near Neptune or Uranus. The existence of a concentration of comets just beyond the planetary region (an inner Oort cloud) is indicated, as suggested by other authors from different lines of argument.

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