The 66 - 150 metre wide asteroid 2015 CW13 will make a close pass (13.5 LD, 0.0348 AU) travelling at 5.75 km/second, to the Earth-Moon system on the 3rd April 2015 @ 15:58 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).