The 15 - 33 metre wide asteroid 2014 SH224 will make a close pass (2.3 lunar distances, 0.0058 AU), travelling at 10.87 km/second, to the Earth-Moon system on the 29th September 2014 @ 16:45 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).