* Astronomy

Orbital elements:
2013 CZ                                                  Earth MOID = 0.0784 AU
Epoch 2013 Apr. 18.0 TT = JDT 2456400.5                 MPC
M  39.19125              (2000.0)            P               Q
n   0.60340184     Peri.   12.82160     -0.79596778     -0.54814943
a   1.3869633      Node   130.88006     +0.52107772     -0.83637890
e   0.2359808      Incl.   19.85864     +0.30808002     -0.00159334
P   1.63           H   23.4           G   0.15           U   8

MPEC 2013 - C11

Key to Orbital elements

The 56 - 120 metre wide asteroid 2013 CZ made a close pass (30.7 lunar distances, 0.0790 AU), travelling at 11.00 km/second, to the Earth-Moon system on the 1st February, 2013 @ 05:44 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).