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Orbital elements:
2013 CY129                                               Earth MOID = 0.1282 AU
Epoch 2013 Apr. 18.0 TT = JDT 2456400.5                 MPC
M  30.46341              (2000.0)            P               Q
n   0.46560749     Peri.  354.53972     -0.82367474     -0.52993936
a   1.6486283      Node   150.50096     +0.53455022     -0.84438771
e   0.3230938      Incl.   24.19396     +0.18925112     +0.07857271
P   2.12           H   24.3           G   0.15           U   6

MPEC 2013 - D19

Key to Orbital elements

The 34 - 75 metre wide asteroid 2013 CY129 will make a close pass (51.9 lunar distances, 0.1335 AU), travelling at 13.28 km/second, to the Earth-Moon system on the 18th February, 2013 @ 02:16 UT ±00:13. 

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