90377 Sedna
Dwarf planet
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Sedna is a dwarf planet in the outermost reaches of the Solar System, orbiting the Sun beyond the orbit of Neptune. Discovered in 2003, the planetoid's surface is one of the reddest known among Solar System bodies. Wikipedia
Orbits: Sun
Radius: 309.13 mi
Discovered: November 14, 2003
Discoverers: Michael E. Brown, Chad Trujillo, and David L. Rabinowitz