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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.
Sedna (Inuktitut: ᓴᓐᓇ, romanized: Sanna, previously Sedna or Sidne) is the goddess of the sea and marine animals in Inuit religion, also known as the Mother of the Sea or Mistress of the Sea. The story of Sedna, which is a creation myth, describes how she came to rule over Adlivun , the Inuit version of the underworld .
Sedna may refer to: Sedna (mythology), the Inuit goddess of the sea; Sedna (dwarf planet), a trans-Neptunian dwarf planet; Sedna (beverage), a tonic wine, formerly made in Belfast; Sedna (database), a native XML database; Doriprismatica sedna, a species of nudibranch; Sedna Finance, a structured investment vehicle; Sedna Planitia, a landform on ...
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 ...
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]). Body [ note 1 ]
On the other hand, the surfaces of Sedna, Gonggong, and Quaoar have low abundances of CO and CO 2, similar to Pluto, Eris, and Makemake but in contrast to smaller bodies. This suggests that the threshold for dwarf planethood in the trans-Neptunian region is a diameter of ~900 km (thus including only Pluto, Eris, Haumea, Makemake, Gonggong ...
It was the third sednoid discovered, after Sedna and 2012 VP 113, and measures around 220 kilometers (140 miles) in diameter. [8] Discovery.
If Sedna had been captured from another planetary system that rotated in the same direction as the Solar System, then all of its population would have orbits on relatively low inclinations and have semi-major axes ranging from 100 to 500 AU. If it rotated in the opposite direction, then two populations would form, one with low and one with high ...