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.

Jun 14, 2023 · Way out past the distant orbit of dwarf planet Pluto, Sedna revolves around the sun in a highly eccentric and elongated orbit and while it has the necessary characteristics, scientists can't definitively call it a dwarf planet yet.

Nov 14, 2003 · Sedna is categorized as a minor planet since its orbit takes it directly around the sun. The distant world is up for consideration as a dwarf planet, however for this to happen, scientists would have to prove that the planetoid is in hydrostatic equilibrium .

Sedna is a dwarf planet whose orbit extends beyond the orbit of Neptune. NASA JPL has not classified Sedna as potentially hazardous because its orbit does not bring it close to Earth. Sedna orbits the sun every 4,600,000 days (12,594.11 years), coming as close as 76.37 AU and reaching as far as 1006.83 AU from the sun.

Feb 21, 2025 · Sedna, small body in the outer solar system that may be the first discovered object from the Oort cloud. Sedna was discovered in 2003 by a team of American astronomers at Palomar Observatory on Mount Palomar, California.

Jan 22, 2020 · Sedna is dwarf planet out far beyond Pluto. Here's what we know about Sedna so far and a look at what we suspect is true.

Mar 15, 2004 · At its most distant, Sedna is 130 billion kilometers (84 billion miles) from the Sun, which is 900 times Earth's solar distance. Scientists used the fact that even the Spitzer telescope was unable to detect the heat of the extremely distant, cold object to determine it must be less than 1,700 kilometers (about 1,000 miles) in diameter, which is ...

Mar 21, 2025 · A surprising chemical difference between Pluto and Sedna, another dwarf planet in the distant Kuiper Belt, is helping scientists nail down their respective masses, a new study reports.

90377 Sedna (or simply Sedna; symbol ) [1] is a trans-Neptunian object which is the farthest dwarf planet from the Sun. It was discovered on November 14, 2003 [2] by Mike Brown, Chad Trujillo and David Rabinowitz. [3] [4] Around 1250-1800 km in diameter, [3] Sedna takes roughly 11,400 years to orbit the Sun, much higher than most known trans ...

Apr 30, 2014 · Sedna is a solar system body that is one of the most distant bodies found in our solar system. The object's closest approach to the sun is far greater than Pluto's distance away from Earth — at...