The 78 - 180 metre wide asteroid 2015 QA will make a close pass (42.6 LD, 0.1094 AU) travelling at 5.94 km/second, to the Earth-Moon system on the 30th August 2015 @ 21:49 UT ±00:14.
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The Lunar Distance (LD), the distance between Earth and the Moon, equals 384,401 km, (or 0.00256 AU).