Cis-Neptunian object.html |
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| TNOs and similar bodies |
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*Trans-Neptunian dwarf planets are "plutoids"
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A Cis-Neptunian object is, literally, any astronomical body found within the orbit of Neptune.1 However, the term is typically used for objects other than Trans-Neptunian objects, the planets, their moons, and traditional asteroids: 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 asteroids known as centaurs2 and the Neptune Trojans.3
Centaurs orbit the Sun between Jupiter and Neptune, often crossing the orbits of the large gas giant planets. There is an emerging sense2 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.4 Known Neptune trojans lie in an elongated region around the L4 Lagrangian point 60° ahead of Neptune.
Notes
- ^ These are 2001 QR322, 2004 UP10, 2005 TN53, 2005 TO74, 2006 RJ103 and 2007 VL305.3
References
- ^ Remo, John L. (2007). Classifying Solid Planetary Bodies. New trends in astrodynamics and applications III. AIP Conference Proceedings, Volume 886, pp. 284-302.
- ^ a b J Horner, NW Evans, ME Bailey, DJ Asher (2003). "The Populations of Comet-like Bodies in the Solar System". Retrieved on 2007-06-29.
- ^ a b "List Of Neptune Trojans". Minor Planet Center. Retrieved on 2008-05-08.
- ^ Sheppard, Scott S.; Trujillo, Chadwick A. (June 2006). "A Thick Cloud of Neptune Trojans and Their Colors" (PDF). Science 313 (5786): 511–514. doi:. PMID 16778021, http://www.dtm.ciw.edu/sheppard/pub/Sheppard06NepTroj.pdf. Retrieved on 26 February 2008.