narcoleptish wrote:Or the asteroid 130 Elektra, which would dwarf the Buick, and be very bad for us.
Wikipedia claims 130 Elektra has a mass of 6.6 x 10^18 kg. If it hit, say, Lake Mendota, with a typical asteroid velocity of 20,000 m/second, the kinetic energy of the impact would be 1.3 octillion joules [kind of cool to have an excuse to use the word "octillion" here]. This is something like 18 million times larger than the kinetic energy of the dinosaur-killing asteroid impact.
The crater resulting from a 1.3 x 10^27 joule impact would have a radius of around 1200 km and would look more or less like this:
A Buick Electra colliding with the Earth would produce a somewhat smaller crater.