The 670 - 1500 metre wide asteroid 2006 GQ2 will make a close pass (65.9 lunar distances, 0.1694 AU), travelling at 21.39 km/second, to the Earth-Moon system on the 19th September, 2014 @ 03:38 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).