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Tyche (planet)

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An artist's rendering of the Oort cloud and the Kuiper belt (inset)

Tyche is the nickname given to a possible gas giant planet in the Solar System's Oort cloud. It was first proposed in 1999 by astronomer John Matese of the University of Louisiana at Lafayette.[1][2]

Matese and Daniel Whitmire say that the points of origin for long-period comets gives a pattern that suggests Tyche's existence. They noted that Tyche, if it exists, should be seen in the archive of data that was collected by NASA's Wide-field Infrared Survey Explorer (WISE) telescope.[3] However, several astronomers disagree that Tyche exists.[2][4] In 2014 NASA announced that WISE had not found such a planet. [5]


  1. Rodgers, Paul (13 February 2011). "Up telescope! Search begins for giant new planet". The Independent. Retrieved February 14, 2011.
  2. 2.0 2.1 Wolchover, Natalie (2011). "Article: Astronomers doubt giant planet 'Tyche' exists in our Solar System". Retrieved February 15, 2011.
  3. Matese, John J.; Whitmire, Daniel P. (2011). "Persistent evidence of a jovian mass solar companion in the Oort cloud" (PDF). Icarus 211 (2): 926–938. doi:10.1016/j.icarus.2010.11.009 .
  4. Plait, Phil (2011). "No, there’s no proof of a giant planet in the outer Solar System". Discovery Magazine. Retrieved February 15, 2011.
  5. Helhoski, Anna. "News 02/16/11 Does the Solar System have giant new planet?". The Norwalk Daily Voice. Retrieved 10 July 2012.