The 120 - 270 metre wide asteroid 2015 PM307 will make a close pass (59.9 LD, 0.1538 AU) travelling at 34.37 km/second, to the Earth-Moon system on the 27th August 2015 @ 12:05 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).