The 11 - 24 metre wide asteroid 2015 KG made a close pass (14.3 LD, 0.0368 AU) travelling at 5.18 km/second, to the Earth-Moon system on the 18th May 2015 @ 04:47 UT ±00:16.
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The Lunar Distance (LD), the distance between Earth and the Moon, equals 384,401 km, (or 0.00256 AU).