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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.
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 ...
Among the extreme trans-Neptunian objects are three high-perihelion objects classified as sednoids: 90377 Sedna, 2012 VP 113, and 541132 Leleākūhonua. They are distant detached objects with perihelia greater than 70 au. Their high perihelia keep them at a sufficient distance to avoid significant gravitational perturbations from Neptune.
Toggle 90377 Sedna subsection. 1.1 Iridia. 1.2 Sasata. Toggle the table of contents. Wikipedia: Featured article candidates/90377 Sedna/archive1. Add languages.
Orbital characteristics [4] Epoch 31 May 2020 (JD 2459000.5) ... It was the third sednoid discovered, after Sedna and 2012 VP 113, and measures around 220 kilometers ...
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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]
90377 Sedna: 2.66 [69 ... hypothesis is considered unlikely by many experts owing to available simpler explanations that align with the expected characteristics of ...