Statistics – Computation
Scientific paper
Nov 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002esasp.500..327e&link_type=abstract
In: Proceedings of Asteroids, Comets, Meteors - ACM 2002. International Conference, 29 July - 2 August 2002, Berlin, Germany. Ed
Statistics
Computation
2
Trans-Neptunian Objects
Scientific paper
A number of trans-Neptunian objects (TNOs) move in high-eccentricity orbits with perihelia located far from Neptune. Numerical integrations show that the objects with perihelion distances q>38 AU have small probabilities to reach the near-Neptune zone for the age of the Solar system. On the other hand, there are a few objects with perihelia in the vicinity of Neptune's orbit and semi-major axes a>60 AU. To understand the origin of TNOs with such unusual orbital properties we carry out extensive computations of the dynamical evolution for objects from various zones of the trans-Neptunian region. We follow thousands of objects for the age of the Solar system using our symplectic code that can handle both high-eccentricity orbits and close encounters with planets. This study shows that neither the disc of objects scattered by Neptune nor the conventional inner core of the Oort cloud can produce the observed distribution of TNOs in high-eccentricity orbits. The present orbital distribution of outer TNOs corresponds to a recent injection of bodies into high-eccentricity orbits from an extended disc located substantially further than the classical Edgeworth-Kuiper belt.
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