* Astronomy

2005 YU55 Earth Impact Risk Summary
Torino Scale (maximum) 1 Palermo Scale (maximum) -2.33 Palermo Scale (cumulative) -2.12 Impact Probability (cumulative) 3.5e-04 Number of Potential Impacts 36	Vimpact 17.56 km/s Vinfinity 13.57 km/s H 21.8 Diameter 0.150 km Mass 4.6e+09 kg Energy 1.7e+02 MT all above are mean values weighted by impact probability
Analysis based on 147 observations spanning 1563.7 days (2005-Dec-24.29832 to 2010-Apr-06.03428)

2005 YU55 Earth Impact Risk Summary
Torino Scale (maximum) 1 Palermo Scale (maximum) -2.00 Palermo Scale (cumulative) -1.83 Impact Probability (cumulative) 8.1e-04 Number of Potential Impacts 61	Vimpact 17.56 km/s Vinfinity 13.57 km/s H 21.9 Diameter 0.140 km Mass 3.6e+09 kg Energy 1.3e+02 MT all above are mean values weighted by impact probability
Analysis based on 51 observations spanning 1533.0 days (2005-Dec-24.29832 to 2010-Mar-06.342175)

Orbital elements:
2005 YU55                                           PHA, Earth MOID = 0.0011 AU
Epoch 2010 Jan. 4.0 TT = JDT 2455200.5                  MPC
M 224.27981              (2000.0)            P               Q
n   0.80909599     Peri.  268.88966     +0.62003986     +0.78455009
a   1.1406070      Node    39.43121     -0.71625652     +0.56896725
e   0.4289307      Incl.    0.50809     -0.32019864     +0.24649020
P   1.22           H   21.9           G   0.15           U   4

MPEC 2010 - D58

Update:
The 110 - 240 metre wide asteroid 2005 YU55 will make a close pass (5.9 lunar distances, 0.0152 AU), travelling at 13.12 km/second, to the Earth-Moon system on the 19th April, 2010.

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

2005 YU55 Earth Impact Risk Summary
Torino Scale (maximum) 0 Palermo Scale (maximum) -4.89 Palermo Scale (cumulative) -3.83 Impact Probability (cumulative) 5.0e-06 Number of Potential Impacts 66	Vimpact 17.57 km/s Vinfinity 13.58 km/s H 22.0 Diameter 0.130 km Mass 3.3e+09 kg Energy 1.2e+02 MT all above are mean values weighted by impact probability
Analysis based on 42 observations spanning 29.861 days (2005-Dec-24.29832 to 2006-Jan-23.15924)

What is bigger than Apophis and will arrive on November 8, 2011?
2005 YU55 on 11-8.11
And no one is talking much about it.
This asteroid, first discovered in December of 2005, remains mostly a mystery. Even its size is a guess. What's not a guess is when it will arrive again in the vicinity of earth.

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