YP

YP may refer to:

List of minor planets: 31001–32000

2013 YP139

2013 YP₁₃₉ is an Apollo 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 2013.2013 YP₁₃₉ 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

2013 YP₁₃₉ 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 2013 YP₁₃₉ as a potential threat. At the time of discovery, 2013 YP₁₃₉ was moving at a rate of 3.2° per day (for comparison the apparent diameter of the Moon is 0.5°).