Cis-Neptunian object

Cis-Neptunian object
Types of Distant Minor Planets
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*Trans-Neptunian dwarf planets are "plutoids"

A cis-Neptunian object is, literally, any astronomical body found within the orbit of Neptune.[1] 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[2] 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 sense[2] 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] As of August 2010, all known Neptune trojans except one lie in an elongated region around the L4 Lagrangian point 60° ahead of Neptune.

Notes

References

  1. ^ Remo, John L. (2007). Classifying Solid Planetary Bodies. New trends in astrodynamics and applications III. AIP Conference Proceedings, Volume 886, pp. 284-302.
  2. ^ a b J Horner, NW Evans, ME Bailey, DJ Asher (2003). "The Populations of Comet-like Bodies in the Solar System". http://star.arm.ac.uk/preprints/396.pdf. Retrieved 2007-06-29. 
  3. ^ a b "List Of Neptune Trojans". Minor Planet Center. http://www.minorplanetcenter.org/iau/lists/NeptuneTrojans.html. Retrieved 2010-10-27. 
  4. ^ Sheppard, Scott S.; Trujillo, Chadwick A. (June 2006). "A Thick Cloud of Neptune Trojans and Their Colors" (PDF). Science 313 (5786): 511–514. Bibcode 2006Sci...313..511S. doi:10.1126/science.1127173. PMID 16778021. http://www.dtm.ciw.edu/sheppard/pub/Sheppard06NepTroj.pdf. Retrieved 2008-02-26. 

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