* Astronomy

Orbital elements:
2013 CY                                                  Earth MOID = 0.0009 AU
Epoch 2013 Apr. 18.0 TT = JDT 2456400.5                 MPC
M  94.56915              (2000.0)            P               Q
n   0.83844864     Peri.  149.48623     -0.03752445     -0.99922991
a   1.1138287      Node   302.66199     +0.91406283     -0.02968418
e   0.1341135      Incl.    0.78047     +0.40383296     -0.02565999
P   1.18           H   28.4           G   0.15           U   4

MPEC 2013 - C10

Key to Orbital elements

The 6 - 13 metre wide asteroid 2013 CY made a close pass (0.9 lunar distances, 0.0023 AU), travelling at 2.93 km/second, to the Earth-Moon system on the 28th January, 2013 @ 06:09 UT ±00:01. 

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