90377 Sedna, or simply Sedna, is a large planetoid in the outer reaches of the Solar System that was, as of 2020, at a distance of about 85 astronomical units from the Sun, about three times as far as Neptune.
Orbital period: 11,408Â years
Radius: 497.5Â km
Discovered: 14 November 2003
Orbits: Sun
Temperature: â 12 K
Perihelion: 76.257 AU (11.4079 Tm)
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