Sedna was not the only object close to Pluto's size to be discovered in the early 2000s. Brown's team also found Quaoar, another dwarf planet candidate, and Eris.

Sedna will reach its closest approach to the Sun in 2076, providing a remarkable space-faring opportunity that won’t come again for another 11,400 years.

Sedna has a highly eccentric and elongated orbit and is currently moving to its perihelion—the closest it gets to the Sun during its massive 11,400 years orbit. It will reach that point in 2073-74.

Discovered in 2004 and named after the Inuit goddess of the sea, Sedna (also known as 90377 Sedna) is 800 miles wide—twice the size of Biden. It gets to within 76 au of the Sun, and to 937 au ...

Despite its cold environment, with temperatures never exceeding −240°C, Sedna presents an exciting opportunity for exploration.The study of Sedna’s surface, atmosphere, and any potential ...

Sedna, the Solar System's farthest known object, does not have a moon, puzzled astronomers have revealed. Its slow spin was thought to be due to the gravity of a small, companion body. Researchers ...

Although Sedna is unusual in many other ways, its rotation period is normal, meaning that no moon is required to slow it down. David A. Aguilar (CfA) April 7, 2005 ...