* Astronomy

Orbital elements:
2012 YR1                                                 Earth MOID = 0.0010 AU
Epoch 2012 Sept. 30.0 TT = JDT 2456200.5                MPC
M 339.24101              (2000.0)            P               Q
n   0.33771941     Peri.  341.91902     +0.45013623     -0.89188699
a   2.0422020      Node    81.30926     +0.82464287     +0.39639915
e   0.5278904      Incl.    2.53724     +0.34255147     +0.21772760
P   2.92           H   26.6           G   0.15           U   8

MPEC 2012 - Y16

The 13 - 30 metre wide asteroid 2012 YR1 made a close pass (5.8 lunar distances, 0.0150 AU), travelling at 8.52 km/second, to the Earth-Moon system on the 19th December, 2012 @ 10:13 UT ±00:05. 

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