The 39 - 87 metre wide asteroid 2018 GD3 will make a close pass (25.0 lunar distances, 0.06443 AU), travelling at 7.95 km/second, to the Earth on the 24th April 2018 @ 02:16 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).
