The 180 - 410 metre wide asteroid 2018 GC will make a close pass (71.9 lunar distances, 0.18486 AU), travelling at 17.72 km/second, to the Earth on the 1st May 2018 @ 04:40 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).