2003 UB313 (dwarf planet)
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2003 UB313 is a trans-Neptunian object (TNO) believed to be larger than the dwarf planet Pluto. NASA, who discovered it from Mount Palomar, called it the "tenth planet". The International Astronomical Union (IAU) explained the definition of the term "planet" in early September 2006, and decided that 2003 UB313 is not a planet.
2003 UB313 circulates around the sun in a part of space known as the scattered disc. It has at least one moon. 2003 UB313 and its moon are currently the farthest known objects in our solar system.
2003 UB313 should get a name soon. Claims that it has been named 'Xena' or 'Lila' are wrong. 'Xena' is an informal codename used by its discoverers among themselves. 'Lila' is a name in the address of the web page where the object was announced, after the newly-born daughter of one of the discoverers. Neither name was submitted to the IAU.