The 300 - 680 metre wide asteroid 2006 NL will make a close pass (53.6 lunar distances, 0.1379 AU), travelling at 15.51 km/second, to the Earth-Moon system on the 11th July, 2013 @ 00:31 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).
