The 30 - 68 metre wide asteroid 2014 NB3 will make a close pass (37.6 lunar distances, 0.0967 AU), travelling at 7.28 km/second, to the Earth-Moon system on the 13th July 2014 @ 09:36 UT ±00:09.
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The Lunar Distance (LD), the distance between Earth and the Moon, equals 384,401 km, (or 0.00256 AU).