* Astronomy

Orbital elements:
2012 XR2                                                 Earth MOID = 0.1220 AU
Epoch 2012 Sept. 30.0 TT = JDT 2456200.5                MPC
M 321.63379              (2000.0)            P               Q
n   0.40138895     Peri.  209.11590     -0.25916099     -0.86596284
a   1.8200882      Node   258.75845     +0.94889006     -0.14569841
e   0.4115012      Incl.   25.85443     +0.18012003     -0.47841440
P   2.46           H   23.2           G   0.15           U   9

MPEC 2012 - X20

The 62 - 140 metre wide asteroid 2012 XR2 will make a close pass (53.6 lunar distances, 0.1377 AU), travelling at 15.54 km/second, to the Earth-Moon system on the 12th December, 2012 @ 09:07 UT ±10:38. 

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