Killer asteroid

As if we didn't have enough to worry about (from Slashdot).

A recently rediscovered 400-meter Near-Earth Asteroid (NEA) is predicted to pass near the Earth on 13 April 2029. The flyby distance is uncertain and an Earth impact cannot yet be ruled out.
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Today's impact monitoring results indicate that the impact probability for April 13, 2029 has risen to about 1.6%, which for an object of this size corresponds to a rating of 4 on the ten-point Torino Scale. Nevertheless, the odds against impact are still high, about 60 to 1,...

The impact energy would be 2000 megatons, 40 times larger than the most powerful nuclear weapon ever tested.

A 1% chance of a disaster of that magnitude is a major concern. Hopefully, subsequent measurements will rule out a collision.