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2013 YP139
is a near-Earth asteroid discovered at a distance of 0.235 astronomical units from Earth.〔 by the Wide-field Infrared Survey Explorer. The asteroid is estimated to be 0.650 kilometers (0.404 miles) in diameter, 43 million kilometers (27 million miles) away, and is expected to come within 490,000 kilometers (300,000 miles) of Earth, though not within one hundred years of its discovery in 2013.〔 is the first asteroid to be discovered by the reinstated NEOWISE program of the Wide-field Infrared Survey Explorer, following the program's hibernation in 2011.〔
==Description==
is very dark, with an albedo comparable to a piece of coal. It orbits the Sun in an elliptical orbit along the invariable plane and is currently 42 million kilometers (27 million miles) away and is expected to come within 490,000 kilometers (300,000 miles) of Earth, slightly beyond the orbit of the Moon.〔 Due to this close proximity, NASA has classified as a potential threat. At the time of discovery, was moving at a rate of 3.2° per day (for comparison the apparent diameter of the Moon is 0.5°).
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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