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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 ...
A super-Earth at 250 AU would cause these objects to librate around ω = 0° ± 60° for billions of years. There are multiple possible configurations and a low-albedo super-Earth at that distance would have an apparent magnitude below the current all-sky-survey detection limits. This hypothetical super-Earth has been dubbed Planet Nine. Larger ...
Distance Date Velocity km/s 2300 AU: 1606: ... 90377 Sedna: 2.66 [69] 483 in 11796 days ... (and so at a reasonable distance from Earth), and yet be able to gain ...
For comparison, the semi-major axis of the planetoid 90377 Sedna is about 500 AU. [18] In an extreme case, the scattered-disc object 2014 FE 72 has a semi-major axis around 1,400 AU, [19] though its distance from the Sun as of 2021 is about 64 AU, approximately half 2018 VG 18 's distance from the Sun in that year. [20]
Sedna's orbit takes it far beyond even the Kuiper belt (30–50 AU), out to nearly 1,000 AU (Sun–Earth distance) Main article: Extreme trans-Neptunian object Among the extreme trans-Neptunian objects are three high-perihelion objects classified as sednoids : 90377 Sedna , 2012 VP 113 , and 541132 Leleākūhonua .
Trans-Neptunian objects plotted by their distance and inclination. ... the radius of Earth's orbit). ... The discovery of 90377 Sedna in 2003, ...
For the giant planets, the "radius" is defined as the distance from the center at which the atmosphere reaches 1 bar of atmospheric pressure. [11] Because Sedna and 2002 MS 4 have no known moons, directly determining their mass is impossible without sending a probe (estimated to be from 1.7x10 21 to 6.1×10 21 kg for Sedna [12]).