The 35 - 78 metre wide asteroid 2015 LP21 will make a close pass (35.0 LD, 0.0900 AU) travelling at 9.28 km/second, to the Earth-Moon system on the 21st June 2015 @ 03:22 UT ±00:05.
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The Lunar Distance (LD), the distance between Earth and the Moon, equals 384,401 km, (or 0.00256 AU).
