The 59 - 130 metre wide asteroid 2014 QW33 will make a close pass (55.1 Lunar Distances, 0.1415 AU), travelling at 6.44 km/s, to the Earth-Moon system on the 16th September, 2014 @ 03:16 UT ±00:25.
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The Lunar Distance (LD), the distance between Earth and the Moon, equals 384,401 km, (or 0.00256 AU).