* Astronomy

Orbital elements:
2012 XM55                                                Earth MOID = 0.0083 AU
Epoch 2012 Sept. 30.0 TT = JDT 2456200.5                MPC
M 254.12361              (2000.0)            P               Q
n   0.85543940     Peri.   60.56689     -0.70590277     -0.70788312
a   1.0990309      Node    74.35769     +0.64070859     -0.65292640
e   0.1302139      Incl.    1.46094     +0.30198308     -0.26942273
P   1.15           H   27.8           G   0.15           U   7

MPEC 2012 - X47

The 7 - 16 metre wide asteroid 2012 XM55 will make a close pass (3.1 lunar distances, 0.0078 AU), travelling at 2.88 km/second, to the Earth-Moon system on the 23rd December, 2012 @ 20:22 UT ±00:14. 

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