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. Spectroscopy has revealed Sedna's surface to be. .
DiscoverySedna ( 2003 VB12) was discovered by Michael Brown (), (),. .
In their paper announcing the discovery of Sedna, Brown and his colleagues described it as the first observed body belonging to the .
The discovery of Sedna renewed the old question of just which ought to be considered , and which ones ought not to be. On 15 March 2004, articles on Sedna in the popular press reported misleadingly that a tenth planet had been discovered.. .
Sedna has the longest of any known object in the Solar System of its size or larger with an orbital period of around 11,400 years. Its .
Sedna has a of about 1.8, and is estimated to have an (reflectivity) of around 0.41, giving it a diameter of. .
Sedna's highly elliptical orbit, and thus a narrow temporal window for detection and observation with currently available technology, means that the probability of its detection was roughly 1. .
Sedna will come to perihelion around July 2076. This close approach to the Sun provides a window of opportunity for studying it that will not occur again for more than 11 thousand years. Because Sedna spends much of its orbit beyond the ,. [pdf]
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