The 69 - 150 metre wide asteroid 2018 GB2 will make a close pass (17.0 lunar distances, 0.04379 AU), travelling at 14.56 km/second, to the Earth on the 27th April 2018 @ 17:15 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).