|
, also written as (42301) 2001 UR163, is likely a dwarf planet〔 ((Which are the dwarfs in the Solar System?) )〕 that resides in the scattered disc. It was discovered on October 21, 2001 by the Deep Ecliptic Survey (DES) program at Kitt Peak. Light-curve-amplitude analysis shows only small deviations, suggesting that is a spheroid with small albedo spots.〔Tancredi, G., & Favre, S. (2008) (''Which are the dwarfs in the Solar System?'' ). Depto. Astronomía, Fac. Ciencias, Montevideo, Uruguay; Observatorio Astronómico Los Molinos, MEC, Uruguay. Retrieved 10-08-2011〕 Michael Brown's website lists it as a highly likely dwarf planet, but the diameter of the object has never been measured. has the reddest color index of any object in the Solar System. On October 31, 2002, the 3.6-meter Canada–France–Hawaii Telescope observed set a record red reading of B−R=2.28. This makes even redder than 5145 Pholus, , 90377 Sedna and comet C/2001 T4. Reddening of the spectrum is caused by cosmic irradiation by ultraviolet radiation and charged particles. Becoming bluer in the spectrum is caused by impact collisions exposing the interior of an object. In the visible spectrum, would appear orange-brown, depending on its albedo. It came to perihelion around 1937.〔 In 2006, it moved beyond 50 AU from the Sun. It is currently 51.9 AU from the Sun.〔 ==See also== *List of Solar System objects most distant from the Sun in 2015 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「(42301) 2001 UR163」の詳細全文を読む スポンサード リンク
|