* Astronomy

Orbital elements:
2012 XR111                                               Earth MOID = 0.0695 AU
Epoch 2012 Sept. 30.0 TT = JDT 2456200.5                MPC
M 331.57155              (2000.0)            P               Q
n   0.43770819     Peri.  352.36079     +0.34177622     -0.92385733
a   1.7179596      Node    77.52989     +0.87129339     +0.24280400
e   0.3873090      Incl.   10.16196     +0.35218865     +0.29586119
P   2.25           H   24.9           G   0.15           U   7

MPEC 2012 - X66

The 26 - 58 metre wide asteroid 2012 XR111 made a close pass (29.7 lunar distances, 0.0763 AU), travelling at 7.23 km/second, to the Earth-Moon system on the 9th December, 2012 @ 01:25 UT ±00:29. 

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