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2012 VP113

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2012 VP113

2012 VP113 is a trans-Neptunian object (TNO) orbiting the Sun on an extremely wide elliptical orbit. It is classified as a sednoid because its orbit never comes closer than 80.5 AU (12.04 billion km; 7.48 billion mi) from the Sun, which is far enough away from the giant planets that their gravitational influence cannot affect the object's orbit noticeably. It was discovered on 5 November 2012 at Cerro Tololo Inter-American Observatory in Chile, by American astronomers Scott Sheppard and Chad Trujillo, who nicknamed the object "Biden" because of the "VP" in its designation. The discovery was announced on 26 March 2014. The object's size has not been measured, but its brightness suggests that it is around 450 km (280 mi) in diameter. 2012 VP113 has a reddish color similar to many other TNOs.

2012 VP113 has not yet been imaged by high-resolution telescopes, so it has no known moons. The Hubble Space Telescope is planned to image 2012 VP113 in 2026, which should determine if it has significantly sized moons.

2012 VP113 was first reported to have been observed on 5 November 2012 with NOAO's 4-meter Víctor M. Blanco Telescope at the Cerro Tololo Inter-American Observatory. Carnegie's 6.5-meter Magellan telescope at Las Campanas Observatory in Chile was used to determine its orbit and surface properties.

Before being announced to the public, 2012 VP113 was only tracked by Cerro Tololo Inter-American Observatory (807) and Las Campanas Observatory (304).

2012 VP113 had previously been observed (but not reported) as early as September 2007.

2012 VP113 was abbreviated "VP" and nicknamed "Biden" by the discovery team, after Joe Biden who was then the vice president ("VP") of the United States in 2012.

2012 VP113 has an absolute magnitude of 4.05, which means it may be large enough to be a dwarf planet. The diameter and geometric albedo of 2012 VP113 has not been measured yet. Under the assumption that 2012 VP113 has a moderate geometric albedo of 0.15 (typical of TNOs), its diameter would be around 450 km (280 mi). A wider range of albedos gives a possible diameter range of 300–1,000 km (190–620 mi). It is expected to be about half the size of Sedna and similar in size to Huya. Its surface is moderately red in color, resulting from chemical changes produced by the effect of radiation on frozen water, methane, and carbon dioxide. This optical color is consistent with formation in the gas-giant region and not the classical Kuiper belt, which is dominated by ultra-red colored objects.

2012 VP113 has the farthest perihelion (closest approach to the Sun) of all known minor planets and all known objects in the Solar System as of 2025, greater than Sedna's. Though its perihelion is farther, 2012 VP113 has an aphelion only about half of Sedna's. It is the second discovered sednoid, with a semi-major axis beyond 150 AU and a perihelion greater than 50 AU. The similarity of the orbit of 2012 VP113 to other known extreme trans-Neptunian objects led Scott Sheppard and Chad Trujillo to suggest that an undiscovered object, Planet Nine, in the outer Solar System is shepherding these distant objects into similar type orbits.

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