* Astronomy

Orbital elements:
2012 YN1                                                 Earth MOID = 0.1340 AU
Epoch 2012 Sept. 30.0 TT = JDT 2456200.5                MPC
M 285.31808              (2000.0)            P               Q
n   0.72958204     Peri.   20.59949     -0.30335034     -0.83521096
a   1.2220434      Node    89.43276     +0.79742021     -0.48603075
e   0.0906524      Incl.   27.30439     +0.52163166     +0.25728733
P   1.35           H   23.6           G   0.15           U   8

MPEC 2012 - Y11

The 50 - 110 metre wide asteroid 2012 YN1 will make a close pass (54.8 lunar distances, 0.1407 AU), travelling at 14.15 km/second, to the Earth-Moon system on the 22nd December, 2012 @ 03:03 UT ±00:07. 

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