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Sedna has a huge, ellipical orbit around the sun. It's distance to the sun ranges from 11 billion km to 150 billion km. It takes 12,000 years to orbit the sun!
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I don't care what scientists believe, it's an object with an independant orbit around the sun (doesn't orbit around other object so it's not a satelite), it's not an asteroid, so despite the size it's a planet, a very small one but still a planet.
Iván