The 380 - 860 metre wide asteroid (514568) 1994 RC will make a close pass (47.9 lunar distances, 0.12329 AU), travelling at 15.63 km/second, to the Earth on the 25th April 2018 @ 15:01 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).