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2015 ER61
is a centaur, inner Oort cloud object, near-Earth asteroid, and possibly a damocloid. It has the fourth-largest aphelion of any known minor planet in the Solar System, after , , and . It additionally has the most eccentric orbit of any known minor planet, with its distance from the Sun varying by about 99.9% during the course of its orbit, followed by with an eccentricity of 0.9973.
It comes close to Jupiter, and a close approach in the past threw it on the distant orbit it is on now.
==2017 Perihelion==
was discovered on March 15, 2015 when it was 8.44 AU from the Sun, and magnitude 21.5. As of September 2015, it is magnitude 21.2, and slowly increasing in brightness. In early February 2016, the asteroid will reach magnitude 20, and will make a close approach to Jupiter on March 28, 2016 of 0.925 ± 0.0015 AU. This will change its orbit, significantly decreasing its aphelion distance from 1430 AU to ~1200 AU, and as it passes through the inner Solar System its aphelion decreases to 160 AU, and by 2020 will have an aphelion of 854 AU.
On April 20, 2017, will reach its closest point to the Earth, at ~1.17 AU. At this point, it will be magnitude 14.8, and, assuming a size of 20 km, have an apparent size of 24 mas.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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