The 6 - 12 metre wide asteroid 2015 SM made a close pass (4.0 LD, 0.0103 AU) travelling at 5.41 km/second, to the Earth-Moon system on the 19th September 2015 @ 00:00 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).
