The 420 - 940 metre wide asteroid (242191) 2003 NZ6 will make a close pass (32.4 LD, 0.0833 AU) travelling at 14.09 km/second, to the Earth-Moon system on the 18th July 2015 @ 17:55 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).