The 76 - 170 metre wide asteroid 2018 GQ5 will make a close pass (45.6 lunar distances, 0.11740 AU), travelling at 10.15 km/second, to the Earth on the 20th May 2018 @ 18:52 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).