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Telisto (hypothetical planet)

Telisto is a hypothetical trans-Neptunian object of planetary size,[1] variously dubbed over the years as Planet X and Tyche.[1] If it exists, it is thought to be responsible for the unusual orbits of the sednoids and detached objects.


Originally, it was suspected that a brown dwarf star called Nemesis was responsible for the unusual orbits. After that was ruled out, a gas giant called Tyche became the primary hypothesis. However, that too was ruled out in 2014 after a WISE survey.[2]

See also


  1. ^ a b Iorio, Lorenzo (16 August 2014). "Planet X revamped after the discovery of the Sedna-like object 2012 VP113?". Monthly Notices of the Royal Astronomical Society 444 (1): L78–L79.  
  2. ^ Clavin, Whitney; Harrington, J.D. (7 March 2014). "'"NASA's WISE Survey Finds Thousands of New Stars, But No 'Planet X.  
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