The 110 - 250 metre wide asteroid 2015 LU38 will make a close pass (46.7 LD, 0.1200 AU) travelling at 16.08 km/second, to the Earth-Moon system on the 3rd July 2015 @ 06:34 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).