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Trans-Neptunian object

This article is about solar system objects beyond Neptune. For hypothetical planets, see Planets beyond Neptune.
Types of distant minor planets

A trans-Neptunian object (TNO), also written transneptunian object,[1] is any minor planet in the Solar System that orbits the Sun at a greater average distance than Neptune, which has an orbital semi-major axis of 30.1 astronomical units (au).

Typically, TNOs are further divided into the classical and resonant objects of the Kuiper belt, the scattered disc and detached objects with the sednoids being the most distant ones.[nb 1] As of October 2020, the catalog of minor planets contains 678 numbered and more than 2,000 unnumbered TNOs.[3][4][5][6][7]

The first trans-Neptunian object to be discovered was Pluto in 1930. It took until 1992 to discover a second trans-Neptunian object orbiting the Sun directly, 15760 Albion. The most massive TNO known is Eris, followed by Pluto, Haumea, Makemake, and Gonggong. More than 80 satellites have been discovered in orbit of trans-Neptunian objects. TNOs vary in color and are either grey-blue (BB) or very red (RR). They are thought to be composed of mixtures of rock, amorphous carbon and volatile ices such as water and methane, coated with tholins and other organic compounds.

Twelve minor planets with a semi-major axis greater than 150 au and perihelion greater than 30 au are known, which are called extreme trans-Neptunian objects (ETNOs).[8]

  1. ^ "Transneptunian object 1994 TG2".
  2. ^ McFadden, Weissman, & Johnson (2005). Encyclopedia of the Solar System, footnote p. 584
  3. ^ Cite error: The named reference MPC-List-TNOs was invoked but never defined (see the help page).
  4. ^ Cite error: The named reference MPC-List-Cen-and-SDO was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference TNO-list-Johnstons was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference JPL-TNO-query-I was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference JPL-TNO-query-II was invoked but never defined (see the help page).
  8. ^ C. de la Fuente Marcos; R. de la Fuente Marcos (September 1, 2014). "Extreme trans-Neptunian objects and the Kozai mechanism: signalling the presence of trans-Plutonian planets". Monthly Notices of the Royal Astronomical Society. 443 (1): L59–L63. arXiv:1406.0715. Bibcode:2014MNRAS.443L..59D. doi:10.1093/mnrasl/slu084.


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