Sedna (dwarf planet) - Wikipedia
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.
Sedna | Trans-Neptunian Object, Dwarf Planet & Kuiper Belt
Oct 11, 2024 · 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.
Sedna Is So Distant, We're Not Even Sure It's a Dwarf Planet
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.
The Dwarf Planet Sedna: Discovery and Facts - ThoughtCo
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.
List of possible dwarf planets - Wikipedia
Smaller trans-Neptunian objects have been called dwarf planets if they appear to be solid bodies, which is a prerequisite for hydrostatic equilibrium: planetologists generally include at least Gonggong, Orcus, and Sedna.
Sedna Facts - The Planets
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 .
Most Distant Object in Solar System Discovered
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 ...
Sedna: Possible Dwarf Planet Far From the Sun | Space
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 a...
Kuiper Belt: In Depth - NASA Science
Nov 30, 2017 · Instead, in 2006, the International Astronomical Union created a new class of objects called dwarf planets, and placed Pluto, Eris and the asteroid Ceres in this category. In 2015, NASA's New Horizons spacecraft flew past Pluto, making the first up-close exploration of a Kuiper Belt Object.
Sedna (2003 VB12) - Division of Geological and Planetary Sciences
Sedna is the most distant solar system object ever discovered. It is twice as far from the sun as any other solar system object and three times farther than Pluto or Neptune. Standing on the surface of Sedna, you could block the entire sun with the head of a pin held at arm's length.