* Astronomy

Orbital elements:
2012 XD133                                               Earth MOID = 0.1055 AU
Epoch 2012 Sept. 30.0 TT = JDT 2456200.5                MPC
M 311.50792              (2000.0)            P               Q
n   0.54531597     Peri.  192.98888     -0.11058474     -0.95620699
a   1.4837836      Node   263.84816     +0.93448973     -0.00720337
e   0.2692910      Incl.   15.81703     +0.33837844     -0.29260264
P   1.81           H   22.3           G   0.15           U   7

MPEC 2012 - X84

The 100 - 230 metre wide asteroid 2012 XD133 will make a close pass (41.0 lunar distances, 0.1053 AU), travelling at 8.86 km/second, to the Earth-Moon system on the 18th December, 2012 @ 00:55 UT ±02:01. 

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The Lunar Distance (LD), the distance between Earth and the Moon, equals 384,401 km, (or 0.00256 AU).