The 21 - 46 metre wide asteroid 2015 GZ5 made a close pass (6.5 LD, 0.0168 AU) travelling at 15.07 km/second, to the Earth-Moon system on the 9th April 2015 @ 00:02 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).