* Astronomy

Orbital elements:
2011 YW15                                                Earth MOID = 0.0137 AU
Epoch 2012 Mar. 14.0 TT = JDT 2456000.5                 MPC
M  47.25236              (2000.0)            P               Q
n   0.54562903     Peri.  353.63981     +0.08156111     -0.99276627
a   1.4832160      Node    91.65711     +0.91826553     +0.04048294
e   0.3285857      Incl.    5.05686     +0.38747413     +0.11303214
P   1.81           H   24.6           G   0.15           U   5

MPEC 2011 - Y47

The 31 - 70 metre wide asteroid 2011 YW15 made a close pass (5.1 lunar distances, 0.0131 AU), travelling at 5.09 km/second, to the Earth-Moon system on the 22nd December, 2011 @ 20:26 UT ±00:01.

See more

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