Astronomy and Astrophysics – Astronomy
Scientific paper
May 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004mnras.350..161e&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Volume 350, Issue 1, pp. 161-166.
Astronomy and Astrophysics
Astronomy
12
Celestial Mechanics, Comets: General, Kuiper Belt, Minor Planets, Asteroids, Solar System: Formation
Scientific paper
The dynamical evolution of trans-Neptunian objects (TNOs) to the inner Solar system is investigated. The study is based on the observed sample of high-eccentricity TNOs with perihelia in the near-Neptune region, using a procedure to take account of observational biases. It is shown that observations favour TNOs in high-eccentricity orbits as the main source of Jupiter-family (JF) comets. The relative fraction of objects captured per year from the near-Neptune region to JF comets with perihelion distances q < 1.5 au is estimated as 0.2 × 10-10. The maximum lifetime of typical JF comets with q < 1.5 au is approximately 200 revolutions. Based on the observed population of JF comets, there should be ~1010 TNOs of cometary size in high-eccentricity orbits with 28 < q < 35.5 au. If this population originated 4.5 Gyr ago, the primordial number must have been at least 20 times as large as the present one.
Asher David J.
Bailey Mark E.
Emel'Yanenko Vacheslav Vasilievitch
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