The 57 - 130 metre wide asteroid 2015 JO1 will make a close pass (25.8 LD, 0.0662 AU) travelling at 22.44 km/second, to the Earth-Moon system on the 19th May 2015 @ 21:26 UT ±00:01.
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The Lunar Distance (LD), the distance between Earth and the Moon, equals 384,401 km, (or 0.00256 AU).