* Astronomy

Orbital elements:
2011 WB39                                                Earth MOID = 0.1386 AU
Epoch 2011 Aug. 27.0 TT = JDT 2455800.5                 MPC
M 295.03484              (2000.0)            P               Q
n   0.41651034     Peri.   72.93721     -0.61046404     -0.77630140
a   1.7757651      Node    55.73582     +0.63499449     -0.59826713
e   0.4379743      Incl.   10.96015     +0.47340854     -0.19857639
P   2.37           H   23.3           G   0.15           U   8

MPEC 2011 - W50

The 58 - 130 metre wide asteroid 2011 WB39 will make a close pass (63.6 lunar distances, 0.1635 AU), travelling at 6.71 km/second, to the Earth-Moon system on the 31st December, 2011 @ 10:24 UT ±01:27.

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