synonymExtraNeptune objects(Neptune outer objects) generally refers to outer Neptune objects
The Trans Neptunian object, often referred to as overseas objects, refers tosolar systemPosition or running track in exceedsNeptuneCelestial objects in orbital range.The solar system outside Neptune can be distinguished from the inside outKuiper belt(Kuiper belt) andOort Cloud(Oort cloud) zone.PlutoAnd its satellitesCharon (Charon) is a celestial body of Outer Sea Uranus, but considering that some of Pluto's special orbit is within the orbit of Neptune, if Pluto is discovered, it may not be regarded asplanet。
Celestial bodies such as planets in the universe attract each other by gravity.In the early 1900s, because the observation orbit of the known planets at that time was inconsistent with the expected route, it was assumed that more than one planet outside the orbit of Neptune had not been found (see the tenth planet or unknown planet; Planet X). Then, Pluto and other celestial bodies were discovered outside the orbit of Neptune based on this assumption.Although this problem is not true after the re correction and estimation of Neptune's mass, there are still some orbital disturbances that are too small to explain.
In August 2016, astronomers were searchingsolar systemIn the process of the "Ninth Planet", we accidentally found 10 Outer Neptune objects that had not been detected before.
Based on the positions and orbits of these 10 celestial bodies, they are called "Outer Sea Uranus Objects", which will help to more accurately predict the size of the ninth planet in the solar system and the distance from the sun, because the gravitational action of the ninth planet will affect the operation of small bodies outside Neptune.[1]
Celestial history
Announce
edit
Pluto: was excluded from the list of planets in August 2006.
2003 EL61Asteroids (2003 EL61): not classified (see [1] and [2]).
Eris（Eris(dwarfplanet））: It is a discrete celestial body of the ecliptic, and its orbit is 45 degrees from the ecliptic of other planets in the solar system.Larger than Pluto, it is the largest known outer Neptune object, which was announced on July 29, 2005.At present, it is not among the planets.
2005 FY9Asteroid (2005 FY9): not classified (see [3]).
HypotheticalSolar companion——Vengeance(Nemesis) can be included in the definition of Outer Neptune, but it does not exist in fact.
