The 510 - 1100 metre wide asteroid (438105) 2005 GO22 will make a close pass (51.0 LD, 0.1311 AU) travelling at 31.74 km/second, to the Earth-Moon system on the 9th August 2015 @ 15:18 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).