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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 (10 cm (3.9 in) in diameter), another dwarf planet candidate, is located at Teknikens Hus, a science center in Luleå, 734 km (456 mi) from the Globe. This represents a distance of about 15 billion km; Sedna has a highly elliptical orbit, its distance from the Sun varying between 11 and 140 billion km.
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 ...
1923 map of Europe at Interwar period, by George Washington Bacon (restored by Alex:D) United States postal route map of 1804 at United States Post Office Department , by Abraham Bradley Jr. and Aaron Arrowsmith
Legend of orbits: Sedna (red), Jupiter (orange), Saturn (yellow), Uranus (green), Neptune (blue), and Pluto (purple) Russian Орбита карликовой планеты-кандидата 90377 Седна (красный) по сравнению с внешними планетами и Плутоном, без подписи.
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As of 2019, the object is inbound 78 AU from the Sun; [9] about two-and-a-half times farther out than Pluto's current location. [13] It will come to perihelion (closest approach to the Sun) in 2078. [4] As with Sedna, it would not have been found had it not been on the inner leg of its long orbit.
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