The 18 - 40 metre wide asteroid 2015 FX33 will make a close pass (13.8 LD, 0.0354 AU) travelling at 5.53 km/second, to the Earth-Moon system on the 26th March 2015 @ 18:47 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).