Palermo asteroid calculator

The Palermo Technical Impact Hazard Scale is a logarithmic scale of asteroid impact danger, and is better described on that page than I could describe here. If you've found an asteroid and you want to calculate its Palermo number, just enter its values in here and find out.

Fill in the blanks, then hit "Calculate"

Impact probability =
Time to impact in seconds =
Rock density in kilograms per cubic metre =
Rock volume in cubic metres =
Speed of impact in metres per second =

Palermo number: