* Astronomy

Orbital elements:
2012 XQ55                                                Earth MOID = 0.0366 AU
Epoch 2012 Sept. 30.0 TT = JDT 2456200.5                MPC
M 324.31428              (2000.0)            P               Q
n   0.46096539     Peri.  182.55705     +0.08606514     -0.98616655
a   1.6596780      Node   262.53177     +0.91659457     +0.13410034
e   0.3854201      Incl.    8.21423     +0.39044485     -0.09743012
P   2.14           H   22.9           G   0.15           U   6

MPEC 2012 - X51

The 67 - 150 metre wide asteroid 2012 XQ55 will make a close pass (14.0 lunar distances, 0.0361 AU), travelling at 6.44 km/second, to the Earth-Moon system on the 14th December, 2012 @ 03:51 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).