* Astronomy

Orbital elements:
2010 FC81                                           PHA, Earth MOID = 0.0223 AU
Epoch 2010 July 23.0 TT = JDT 2455400.5                 MPC
M  20.16951              (2000.0)            P               Q
n   0.22875788     Peri.   63.22654     -0.88362978     +0.46787900
a   2.6478010      Node   144.66290     -0.43929435     -0.81602761
e   0.6259217      Incl.    1.68038     -0.16192250     -0.33939384
P   4.31           H   21.9           G   0.15           U   7

MPEC 2010 - G09

2010 FC81 Earth Impact Risk Summary
Torino Scale (maximum) 0 Palermo Scale (maximum) -7.00 Palermo Scale (cumulative) -6.77 Impact Probability (cumulative) 4.9e-09 Number of Potential Impacts 3	Vimpact 17.07 km/s Vinfinity 12.88 km/s H 21.5 Diameter 0.170 km Mass 6.6e+09 kg Energy 2.3e+02 MT all above are mean values weighted by impact probability
Analysis based on 20 observations spanning 3.4526 days (2010-Mar-30.76227 to 2010-Apr-03.21485)

The 130 - 280 metre wide asteroid 2010 FC81 will make a close pass (18.2 lunar distances, 0.0467 AU), travelling at 10.08 km/second, to the Earth-Moon system on the 18th May, 2010.

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