42301 (2001 UR₁₆₃)
42301 (2001 UR₁₆₃) is a resonant trans-Neptunian object and possible dwarf planet located in the outermost region of the Solar System. The object is 583 km in diameter with a high albedo and stays in an uncommon orbital resonance (4:9) with Neptune. It has the reddest color (RR-U) of any object in the Solar System
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