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Cis-Neptunian object : ウィキペディア英語版 | Cis-Neptunian object
A cis-Neptunian object is, literally, any astronomical body found within the orbit of Neptune.〔Remo, John L. (2007). Classifying Solid Planetary Bodies. New trends in astrodynamics and applications III. AIP Conference Proceedings, Volume 886, pp. 284-302.〕 However, the term is typically used for those distant minor planets other than trans-Neptunian objects: that is, all sub-planetary bodies orbiting the Sun at or within the distance of Neptune, but outside the orbit of Jupiter. This includes the icy minor planets known as centaurs and the Neptune trojans.〔(【引用サイトリンク】publisher=Minor Planet Center )〕 Centaurs orbit the Sun between Jupiter and Neptune, often crossing the orbits of the large gas giants. There is an emerging sense〔 that the centaurs may simply be objects similar to scattered-disc objects that were knocked inwards from the Kuiper belt rather than outwards, making them cis-Neptunian rather than trans-Neptunian scattered-disc objects. Neptune trojans, named by analogy to the Trojan asteroids of Jupiter, are a stable reservoir of small bodies sharing Neptune's orbit. As of August 2012, all known Neptune trojans except two lie in an elongated region around the Lagrangian point 60° ahead of Neptune. ==Notes==
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