From Wikipedia site
The object currently has the provisional designation 2003 UB313, given according to the astronomical naming conventions for minor planets of the International Astronomical Union (IAU). Because of the object's importance, it is likely that it will receive an official name soon, which its discoverers have the right to choose, subject to the approval of the IAU. The discovery web page URL uses the name "Planet Lila" , and the team have also been informally referring to the planet by the codename "Xena", after the television series Xena: Warrior Princess, but neither is the name put forward to the IAU. According to the IAU rules, all Kuiper belt objects must be named after deities of creation or the underworld.
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