Apophis larger than thought, less likely to hit us

Two big changes to what we know of the asteroid Apophis (99942 Apophis) took place today upon observing it from about 9 million km away: one was to the size, as it turns out that the asteroid is 315 m in diameter instead of 270, and the other was to the probability of an impact in 2036, down to 1 in over 7 million.

This means that the 2029 close approach will be even better than we thought, as we will be observing an object some 75% more massive than we previously thought.