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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 ...
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.
Quaoar (2002 LM 60) – discovered June 5, 2002, and announced October 7 of that year. One known moon and two known rings. Sedna (2003 VB 12) – discovered November 14, 2003, and announced March 15, 2004. Orcus (2004 DW) – discovered February 17, 2004, and announced two days later. One known moon.
The timeline of discovery of Solar System planets and their natural satellites charts the progress of the discovery of new bodies over history. Each object is listed in chronological order of its discovery (multiple dates occur when the moments of imaging, observation, and publication differ), identified through its various designations (including temporary and permanent schemes), and the ...
It was the third sednoid discovered, after Sedna and 2012 VP 113, and measures around 220 kilometers (140 miles) in diameter. [8] Discovery.
When Sedna was discovered, its extreme orbit raised questions about its origin. Its perihelion is so distant (approximately 76 AU (11.4 billion km; 7.1 billion mi)) that no currently observed mechanism can explain Sedna's eccentric distant orbit.
Animation of Sedna's orbit (in red) with the Hills cloud (in blue) at the last moment of the loop. Sedna is a dwarf planet discovered by Michael E. Brown, Chad Trujillo and David L. Rabinowitz on 14 November 2003.