The 49 - 110 metre wide asteroid 2015 OQ79 will make a close pass (66.4 LD, 0.1707 AU) travelling at 9.28 km/second, to the Earth-Moon system on the 20th August 2015 @ 07:55 UT ±03:25.
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The Lunar Distance (LD), the distance between Earth and the Moon, equals 384,401 km, (or 0.00256 AU).