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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 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 ...
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]
The first TNO to be discovered was Pluto in 1930. It became the namesake of a larger group of resonant objects called plutinos (another such resonant subgroup are the twotinos). It took more than 60 years to discover a second TNO, Albion (provisionally known as 1992 QB 1), in 1992.
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 ...
La grande traversée (English: The Great Adventure; also: Voyage of the Sedna (US); [8] The Great Crossing) [4] is a 2003 Canada-France short documentary film written and directed by Jean Lemire and Thierry Piantanida, [2] [3] as well as co-produced and co-narrated by Jean Lemire, [1] made to foster awareness of global warming as seriously jeopardizing a fragile Arctic ecosystem, the first ...