The 560 - 1200 metre wide asteroid 2006 AW will make a close pass (66.4 LD, 0.1706 AU) travelling at 13.63 km/second, to the Earth-Moon system on the 2nd September 2015 @ 04:30 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).