Trans-Neptunian object

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Euler diagram shawin the teeps o bouks in the Solar Seestem.

A trans-Neptunian object (TNO, an aa written transneptunian object) is ony minor planet in the Solar Seestem that orbits the Sun at a greater average distance (semi-major axis) nor Neptune, 30 astronomical units (AU). Twal minor planets[nb 1] wi a semi-major axis greater nor 150 AU an perihelion greater nor 30 AU are kent, which are cried extreme trans-Neptunian objects (ETNOs).[1]

Notes[eedit | eedit soorce]

  1. 2003 SS422 is excludit frae the coont acause it haes an observation arc o anly 76 days an hence its semi-major axis isna securly kent.

References[eedit | eedit soorce]

  1. 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. Bibcode:2014MNRAS.443L..59D. arXiv:1406.0715. doi:10.1093/mnrasl/slu084.