The 100 - 230 metre wide asteroid 2018 GY1 will make a close pass (13.1 lunar distances, 0.03376 AU), travelling at 16.69 km/second, to the Earth on the 29th April 2018 @ 18:20 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).