The 62 - 140 metre wide asteroid 2015 SY made a close pass (16.7 LD, 0.0429 AU) travelling at 13.68 km/second, to the Earth-Moon system on the 17th September 2015 @ 11:07 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).
