The 33 - 75 metre wide asteroid 2014 QM266 will make a close pass (11.1 lunar distances, 0.0285 AU), travelling at 27.28 km/second, to the Earth-Moon system on the 1st September 2014 @ 09:42 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).