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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: แดแแ, 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's full orbit is illustrated in the third panel along with the object's location in 2004, nearing its closest approach to the Sun. The final panel zooms out much farther, showing that even this large elliptical orbit falls inside what was previously thought to be the inner edge of the spherical Oort cloud : a distribution of cold, icy ...
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 ...
The orbit of dwarf planet candidate 90377 Sedna (red) compared to the outer planets and Pluto, without caption. Legend of orbits: Sedna (red), Jupiter (orange), Saturn (yellow), Uranus (green), Neptune (blue), and Pluto (purple)
The former name was later used for 90377 Sedna, a distant trans-Neptunian object discovered in 2003. [23] I sent [Kavelaars] that bit about Siarnaq, or we call her Nuliajuk, that creature that lives under the sea, who's also know as Sedna. She's got so many names ... sometimes she's simply called the Old Woman Who Lives Down There.
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 is a trans-Neptunian object with the minor-planet number 90377. It was discovered on November 14, 2003, by the astronomers Michael Brown , Chad Trujillo , and David Rabinowitz . As of 2023, Sedna is 84 astronomical units (AU) from the Sun , which is almost three times the distance between Neptune and the Sun. Sedna's orbit is an ellipse ...