This website continuously gathers data from Sentry, NASA JPL's automated, near-earth-object monitoring system, and displays important statistics about all asteroids currently under its observation.
The Palermo Scale This is based on the tabulated impact date, impact probability, and impact energy. NASA essentially grades the danger of each NEO on a curve. Read more here.
This website continuously gathers data from Sentry, NASA Jet Propulsion Lab's automated, near-earth-object monitoring system, and displays important statistics about all asteroids currently under its observation.