散射柯伊伯天体的来龙去脉

柯伊伯带是20世纪90年代的重大天文发现之一。位于柯伊伯带主带之外的散射盘天体，以其所具有的与彗星相似的轨道大偏心率和高倾角，吸引了人们的注意。这些天体的来龙去脉，以及与奥尔特彗星云的关系，成为当前一个有理论和实际意义的争论课题。本文的轨道演化模拟显示，已知的散射天体中的大多数是非常稳定的，它们很可能起源于该区原始星云；亚稳和不稳定散射天体的大部分来源于散射盘外部，远至奥尔特云区域，极个别来自太阳系内部；在今后至少6 000万年内，当前观测到的散射盘天体不会走近太阳成为彗星。

Origin and Evolution of SKBOs

In the 1990s, one of the greatest astronomical discoveries is Kuiper Belt. Scattered Kuiper Belt Objects （SKBOs）lying out of the main Kuiper Belt, have attracted people’s attention for their orbits with greater eccentricity and higher inclination which are similar to comets. The origin and evolution of these objects and relatives with Oort cloud have become a quite theoretical and practical debate presently. The orbital evolution simulations of this paper show that most of the known SKBOs are quite stable, which probably form in the original nebula of this area; most of the less stable and instable objects are from the outer scattered disk, which may extend into Oort cloud, and quite a few members come from the interior of the solar system; at least 60 million years in the future, there will be no SKBOs close to the sun to become comets.