* Astronomy

Orbital elements:
2012 UK171                                               Earth MOID = 0.0130 AU
Epoch 2012 Sept. 30.0 TT = JDT 2456200.5                MPC
M  95.08363              (2000.0)            P               Q
n   1.23460011     Peri.  355.94945     -0.35310990     +0.93534273
a   0.8605680      Node   253.37189     -0.85775814     -0.33268207
e   0.2216384      Incl.    1.26487     -0.37358316     -0.12023568
P   0.80           H   24.2           G   0.15           U   7

MPEC 2012 - U116

The 34 - 75 metre wide asteroid 2012 UK171 made a close pass (7.4 lunar distances, 0.0191 AU), travelling at 5.30 km/second, to the Earth-Moon system on the 27th October, 2012 @ 20:18 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).