The 130 - 280 metre wide asteroid 2018 GM will make a close pass (37.5 lunar distances, 0.09643 AU), travelling at 21.52 km/second, to the Earth on the 14th April 2018 @ 09:59 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).
