* Astronomy

Orbital elements:
2011 XD1                                                 Earth MOID = 0.0239 AU
Epoch 2011 Aug. 27.0 TT = JDT 2455800.5                 MPC
M 304.03823              (2000.0)            P               Q
n   0.39944859     Peri.   27.12183     -0.45075544     -0.88960895
a   1.8259776      Node    89.74970     +0.80506452     -0.44075757
e   0.4564226      Incl.    4.22024     +0.38560428     -0.11970249
P   2.47           H   24.1           G   0.15           U   7

MPEC 2011 - X21

The 42 - 94 metre wide asteroid 2011 XD1 will make a close pass (12.9 lunar distances, 0.0332 AU), travelling at 7.07 km/second, to the Earth-Moon system on the 29th December, 2011 @ 00:22 UT ±02:09.

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