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  2. Planets beyond Neptune - Wikipedia

    en.wikipedia.org/wiki/Planets_beyond_Neptune

    Four test orbits of a trans-Plutonian planet have been integrated forward for four million years in order to determine the effects of such a body on the stability of the Neptune–Pluto 3:2 resonance. Planets beyond Pluto with masses of 0.1 and 1.0 Earth masses in orbits at 48.3 and 75.5 AU, respectively, do not disturb the 3:2 resonance.

  3. List of hypothetical Solar System objects - Wikipedia

    en.wikipedia.org/wiki/List_of_hypothetical_Solar...

    Planet V, a planet thought by John Chambers and Jack Lissauer to have once existed between Mars and the asteroid belt, based on computer simulations. Various planets beyond Neptune: Planet Nine, a planet proposed to explain apparent alignments in the orbits of a number of distant trans-Neptunian objects. Planet X, a hypothetical planet beyond ...

  4. (148209) 2000 CR105 - Wikipedia

    en.wikipedia.org/wiki/(148209)_2000_CR105

    (148209) 2000 CR 105 is the first object discovered in the Solar System to have a semi-major axis exceeding 150 AU, a perihelion beyond Neptune, and an argument of perihelion of 340° ± 55°. [14] It is one of eleven objects known with a semi-major axis greater than 100 AU and perihelion beyond 42 AU. [15] It may be influenced by Planet Nine. [16]

  5. List of unsolved problems in astronomy - Wikipedia

    en.wikipedia.org/wiki/List_of_unsolved_problems...

    Are there any non-dwarf planets beyond Neptune? Why do extreme trans-Neptunian objects have elongated orbits? [1] The rotation rate of Saturn: Why does the magnetosphere of Saturn rotate at a rate close to that at which the planet's clouds rotate? What is the rotation rate of Saturn's deep interior? [2] Satellite geomorphology:

  6. Extreme trans-Neptunian object - Wikipedia

    en.wikipedia.org/wiki/Extreme_trans-Neptunian_object

    The orbits of Sedna, 2012 VP 113, Leleākūhonua, and other very distant objects along with the predicted orbit of Planet Nine [A]. An extreme trans-Neptunian object (ETNO) is a trans-Neptunian object orbiting the Sun well beyond Neptune (30 AU) in the outermost region of the Solar System.

  7. Trans-Neptunian object - Wikipedia

    en.wikipedia.org/wiki/Trans-Neptunian_object

    For a long time, no one searched for other TNOs as it was generally believed that Pluto, which up to August 2006 was classified as a planet, was the only major object beyond Neptune. Only after the 1992 discovery of a second TNO, 15760 Albion , did systematic searches for further such objects begin.

  8. 28978 Ixion - Wikipedia

    en.wikipedia.org/wiki/28978_Ixion

    28978 Ixion (/ ɪ k ˈ s aɪ. ə n /, provisional designation 2001 KX 76) is a large trans-Neptunian object and a possible dwarf planet. It is located in the Kuiper belt, a region of icy objects orbiting beyond Neptune in the outer Solar System. Ixion is classified as a plutino, a dynamical class of objects in a 2:3 orbital resonance with Neptune.

  9. Detached object - Wikipedia

    en.wikipedia.org/wiki/Detached_object

    Carlos de la Fuente Marcos and Ralph de la Fuente Marcos have calculated that some of the statistically significant commensurabilities are compatible with the Planet Nine hypothesis; in particular, a number of objects [a] which are called extreme trans-Neptunian object (ETNOs) [29] may be trapped in the 5:3 and 3:1 mean-motion resonances with a ...