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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 ...
2003 Sedna. 90377 Sedna is a trans-Neptunian object and a likely dwarf planet. For most of its orbit Sedna is farther from the Sun than any other known dwarf planet candidate. In 2003, Sedna was co-discovered by Michael E. Brown, Chad Trujillo, and David Rabinowitz using the Samuel Oschin Telescope at Palomar Observatory. [143] 2003 Psamathe
Astronomer Mike Brown, who co-discovered Sedna in 2003, believes it to be the most scientifically important trans-Neptunian object found to date, as understanding its peculiar orbit is likely to yield valuable information about the origin and early evolution of the Solar System.
Although the survey was sensitive to movement out to 1,000 AU and discovered the likely dwarf planet Gonggong, it detected no new sednoids. [29] Subsequent simulations incorporating the new data suggested about 40 Sedna-sized objects probably exist in this region, with the brightest being about Eris's magnitude (−1.0). [29]
It belongs to the extreme trans-Neptunian objects defined by their large semi-major axis and is the third sednoid ever to be discovered, after Sedna and 2012 VP 113 ("Biden"). Implications of orbit [ edit ]
Surfers beware: Bearded fireworms, caterpillarlike critters that look like they are straight out of a horror movie are lurking in the sand on Texas beaches. " Your worst nightmares are washing up ...
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