* Astronomy

Orbital elements:
2012 XZ6                                                 Earth MOID = 0.1069 AU
Epoch 2012 Sept. 30.0 TT = JDT 2456200.5                MPC
M 349.38727              (2000.0)            P               Q
n   0.36568881     Peri.  139.12189     +0.68252819     -0.30383889
a   1.9366967      Node   251.50548     +0.33956599     +0.93719737
e   0.4776858      Incl.   44.49985     +0.64718638     -0.17129802
P   2.70           H   19.8           G   0.15           U   7

MPEC 2012 - X23

The 290 - 650 metre wide asteroid 2012 XZ6 made a close pass (41.6 lunar distances, 0.1069 AU), travelling at 25.53 km/second, to the Earth-Moon system on the 1st December, 2012 @ 20:48 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).