(55637) 2002 UX25 is a Spitzer dwarf-planet candidate that orbits the Sun in the Kuiper belt beyond Neptune. Its orbit takes roughly 280 years and it has one known moon. This moon makes it much easier to calculate mass and when the size is known also a density. The density has been a surprise to astronomers about 0.82 g/cm3.It is a trans-Neptunian object with an absolute magnitude of 3.6 making it highly likely to be a dwarf planet.
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