The 11 - 25 metre wide asteroid 2015 KV56 made a close pass (12.0 LD, 0.0309 AU) travelling at 6.64 km/second, to the Earth-Moon system on the 20th May 2015 @ 15:37 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).