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Sedna (minor-planet designation: 90377 Sedna) is a dwarf planet in the outermost reaches of the Solar System, orbiting the Sun far beyond the orbit of Neptune. Discovered in 2003, the frigid planetoid is one of the reddest known among Solar System bodies.
It was discovered on November 14, 2003 by astronomers Michael Brown, Chad Trujillo, and David Rabinowitz. Sedna is currently 88 Astronomical units (AU) from the Sun, which is three times the distance between Neptune and the Sun. Sedna's orbit is an ellipse and its aphelion is estimated to be 937 AU.
His team has discovered many trans-Neptunian objects (TNOs). ... 90377 Sedna: November 14, 2003: list: 90482 Orcus: February 17, 2004: list (119951) 2002 KX 14:
Sedna's orbit is so eccentric that it spends only a small fraction of its orbital period near the Sun, where it can be easily observed. This means that unless its discovery was a freak accident, there is probably a substantial population of objects roughly Sedna's diameter yet to be observed in its orbital region. [ 65 ]
Lasers revealed a large settlement—rivaling even Mayan societies in complexity—that had been hidden for centuries.
Sedna (dwarf planet) is part of the Dwarf planets series, a featured topic. This is identified as among the best series of articles produced by the Wikipedia community. If you can update or improve it, please do so. This article appeared on Wikipedia's Main Page as Today's featured article on November 14, 2010, and on November 14, 2023.
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