The 98 - 220 metre wide asteroid 2015 OM35 made a close pass (51.2 LD, 0.1316 AU) travelling at 7.65 km/second, to the Earth-Moon system on the 25th July 2015 @ 23:40 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).