The 420 metre wide asteroid 4034 Vishnu (1986 PA) will make a close pass (59.5 lunar distances, 0.1528 AU), travelling at 12.14 km/second, to the Earth-Moon system on the 1st April, 2013 @ 23:07 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).