The 320 - 710 metre wide asteroid 2006 BB27 will make a close pass (48.6 lunar distances, 0.1249 AU), travelling at 16.16 km/second, to the Earth-Moon system on the 7th August 2014 @ 22:00 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).