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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 beyond the orbit of Neptune.Discovered in 2003, the planetoid's surface is one of the reddest known among Solar System bodies.
One particularly distant body is 90377 Sedna, which was discovered in November 2003.It has an extremely eccentric orbit that takes it to an aphelion of 937 AU. [2] It takes over 10,000 years to orbit, and during the next 50 years it will slowly move closer to the Sun as it comes to perihelion at a distance of 76 AU from the Sun. [3] Sedna is the largest known sednoid, a class of objects that ...
Sedna is a trans-Neptunian object with the minor-planet number 90377. It was discovered on November 14, 2003, by the astronomers Michael Brown , Chad Trujillo , and David Rabinowitz . As of 2023, Sedna is 84 astronomical units (AU) from the Sun , which is almost three times the distance between Neptune and the Sun. Sedna's orbit is an ellipse ...
The first TNO to be discovered was ... and Orcus, all of them being officially recognized as dwarf planets by the IAU except for Gonggong, Sedna, ... 2002 TX 300: 2002:
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:
90377 Sedna is a trans-Neptunian object currently about three times as far from the Sun as Neptune. ... Astronomer Mike Brown, who co-discovered Sedna in 2003, ...
"They are found in the Atlantic Ocean, Mediterranean Sea, and of course the Gulf of Mexico." A bristle worm crawling in the sand along the Texas coast. (Harte Research Institute for Gulf of Mexico ...
Even without gravitational evidence, Mike Brown, the discoverer of Sedna, has argued that Sedna's 12,000-year orbit means that probability alone suggests that an Earth-sized object exists beyond Neptune. 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.