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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.
These four panels show the location of trans-Neptunian object 90377 Sedna, which lies in the farthest reaches of the Solar System. [1] Each panel, moving clockwise from the upper left, successively zooms out to place Sedna in context. The first panel shows the orbits of the inner planets and Jupiter; and the asteroid belt.
Polski: Orbita (potencjalnej) planety karłowatej 90377 Sedna (czerwona) w porównaniu z orbitami planet zewnętrznych i Plutona, bez podpisu. English: The orbit of dwarf planet candidate 90377 Sedna (red) compared to the outer planets and Pluto, without caption.
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]
The first sentence of the article states directly "Sedna (minor-planet designation 90377 Sedna) is a dwarf planet " but the classification section states that the official classification body considers it to be a "scattered object", but also says that some consider it a new class of object, and that it is also expected to meet the requirements ...
90377 Sedna: a distant dwarf planet, proposed for a new category named extended scattered disc (E-SDO), [25] detached objects, [26] distant detached objects (DDO) [27] or scattered-extended in the formal classification by DES. [13] 90482 Orcus: a dwarf planet and the second-largest known plutino, after Pluto. Has a relatively large satellite ...
90377 Sedna, a large trans-Neptunian object, had the provisional designation 2003 VB 12, meaning it was identified in the first half of November 2003 (as indicated by the letter "V"), and that it was the 302nd object identified during that time, as 12 cycles of 25 letters give 300, and the letter "B" is the second position in the current cycle.
Sedna is a trans-Neptunian object with the asteroid number 90377. It was discovered on November 14, 2003 by astronomers Michael Brown , Chad Trujillo , and David Rabinowitz . Sedna is currently 88 Astronomical units (AU) from the Sun , which is three times the distance between Neptune and the Sun. Sedna's orbit is an ellipse and its aphelion is ...