The 180 - 390 metre wide asteroid 1997 XR2 will make a close pass (75.5 LD, 0.1939 AU) travelling at 12.41 km/second, to the Earth-Moon system on the 22nd May 2015 @ 17:01 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).
