* Astronomy

Orbital elements:
2012 YJ7                                                 Earth MOID = 0.0153 AU
Epoch 2012 Sept. 30.0 TT = JDT 2456200.5                MPC
M 288.83518              (2000.0)            P               Q
n   0.47393074     Peri.  254.60174     -0.92418749     +0.37789974
a   1.6292690      Node   307.57006     -0.31811944     -0.84189432
e   0.6297943      Incl.    4.00808     -0.21137054     -0.38523465
P   2.08           H   22.4           G   0.15           U   8

MPEC 2013 - A07

The 77 - 170 metre wide asteroid 2012 YJ7 will make a close pass (19.4 lunar distances, 0.0498 AU), travelling at 20.41 km/second, to the Earth-Moon system on the 10th January, 2013 @ 01:03 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).