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99942 Apophis (2004 MN4)
Earth Impact Risk Summary
Torino Scale (maximum) 0
Palermo Scale (maximum) -2.52
Palermo Scale (cumulative) -2.52
Impact Probability (cumulative) 2.2e-05
Number of Potential Impacts 2
Vimpact 12.59 km/s
Vinfinity 5.87 km/s
H 19.7
Diameter 0.250 km
Mass 2.1e+10 kg
Energy 4.0e+02 MT
all above are mean values
weighted by impact probability
Analysis based on 2 radar delay, 5 Doppler, and
731 optical observations spanning 884.52 days
(2004-Mar-15.10789 to 2006-Aug-16.626954)
Orbit diagram and elements available here.

These results were computed on Oct 19, 2006
 
99942 Apophis (2004 MN4)
Earth Impact Table
Date Distance Width Sigma
Impact		 Sigma
LOV		 Stretch
LOV		 Impact
Probability		 Impact
Energy		 Palermo
Scale		 Torino
Scale
YYYY-MM-DD.DD (rEarth) (rEarth)     (rEarth)   (MT)    
2036-04-13.37  0.53   1.19e-03   0.000   -2.43130   1.60e+03   2.2e-05   4.02e+02   -2.52   0 
2037-04-13.64  0.63   1.11e-03   0.000   4.12077   1.58e+03   8.1e-08   4.01e+02   -4.97   0