The 14 - 31 metre wide asteroid 2015 KP122 made a close pass (15.5 LD, 0.0399 AU) travelling at 10.47 km/second, to the Earth-Moon system on the 26th May 2015 @ 19:43 UT ±00:08.
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The Lunar Distance (LD), the distance between Earth and the Moon, equals 384,401 km, (or 0.00256 AU).