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Дата изменения: Tue May 18 17:48:07 2004
Дата индексирования: Tue Oct 2 05:00:24 2012
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Dynamically Stable `Outer' Solar System Objects

Vacheslav Emel'yanenko (South Ural University, Chelyabinsk, Russia), David Asher and Mark Bailey have shown that a significant fraction of the so-called scattered disc objects in the outer solar system cannot be scattered at all, as their orbits are dynamically stable for essentially the age of the solar system, and they never come close enough to Neptune. Such objects represent a new, dynamically distinct -- and populous -- class of outer solar system object, and their existence raises important questions as to how they are formed. For example, if planets and Edgeworth-Kuiper belt objects (EKOs) formed primarily from low-inclination, low-eccentricity orbits (i.e. according to the conventional view), then there must be some process that scatters many of them onto high-eccentricity orbits. However, this process cannot involve present-day Neptune interactions, and therefore involves other, unknown perturbers, either undiscovered massive objects in the outer solar system, or bodies that existed in the early solar system but which have since been ejected or accreted onto the outer planets.