The 200 - 450 metre wide asteroid (350713) 2001 XP88 will make a close pass (56.1 LD, 0.1441 AU) travelling at 2.96 km/second, to the Earth-Moon system on the 19th August 2015 @ 00:30 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).