The 22 - 49 metre wide asteroid 2015 HJ9 will make a close pass (56.4 LD, 0.1449 AU) travelling at 14.01 km/second, to the Earth-Moon system on the 26th April 2015 @ 04:08 UT ±00:21.
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The Lunar Distance (LD), the distance between Earth and the Moon, equals 384,401 km, (or 0.00256 AU).