Results of close encounters between Pluto and Neptune

Details Results of close encounters between Pluto and Neptune Results of close encounters between Pluto and Neptune

Apr 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988a%26a...195..327o&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 195, no. 1-2, April 1988, p. 327-330.

Statistics

Computation

6

Neptune (Planet), Oort Cloud, Orbital Resonances (Celestial Mechanics), Planetary Orbits, Pluto (Planet), Computational Astrophysics, Probability Density Functions, Planets, Pluto, Neptune, Celestial Mechanics, Dynamics, Astronomy, Orbits, Orbital Elements, Origin, Procedure, Distance, Eccentricity, Perihelion, Aphelion, Inclination, Statistical Analysis, Distribution, Gravity Effects, Models, Formation, Source, Stability

Scientific paper

Based upon the assumption that in the long term Pluto has a chaotic orbit (as opposed to its present stable orbit in resonance with Neptune) it is shown that gross orbital changes under close encounters would be expected on a time-scale of a few times 104yr. Control is not rapidly passed on to the sunward planets: rather, the perihelion distance remains at about 30 AU whilst the aphelion distance is increased to >150 AU, and the inclination is reduced to match the orbital plane of Neptune. A possible origin for Pluto therefore appears to be the inner Oort Cloud. Conversely, if Pluto had formed in its present region at the same time as the rest of the planets then is would have only avoided orbital disruption on account of the stability of its resonances with Neptune. Whatever the origin of Pluto, this stable configuration must have been attained very soon after it entered its present orbit.

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