The 25 - 56 metre wide asteroid 2015 SP2 made a close pass (15.0 LD, 0.0385 AU) travelling at 11.38 km/second, to the Earth-Moon system on the 20th September 2015 @ 03:26 UT ±00:02.
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The Lunar Distance (LD), the distance between Earth and the Moon, equals 384,401 km, (or 0.00256 AU).
