The 46 - 100 metre wide asteroid 2014 SN will make a close pass (48.2 lunar distances, 0.1237 AU), travelling at 6.37 km/second, to the Earth-Moon system on the 24th September 2014 @ 09:17 UT ±00:07.
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The Lunar Distance (LD), the distance between Earth and the Moon, equals 384,401 km, (or 0.00256 AU).