What is the association between a comet size and its crater diameter approximately?

Answer 1

Are you asking how big the crater would be if it struck the Earth? In one sense, it would depend on the size of the comet and the speed; in another sense, it might not matter at all.

The kinetic energy of any object is the mass times the velocity squared. Calculate the approximate mass of the comet, multiply it by the collision speed. If the comet were to come from behind, the impact velocity would be lower than if the comet hit us "head on". Whatever the comet's velocity, you would need to add the Earth's escape velocity; any object falling to Earth from space will have a additional velocity from Earth's gravity, which is 7 miles per second, about 25,000 miles per hour.

Here's why it really wouldn't matter; if the comet is big enough and fast enough, it won't create a crater; it will re-make the Earth itself. The comet could punch THROUGH the crust of the planet, releasing the magma, the liquid rock in the mantle. If it's big enough, it could wipe out humanity, and many other species on Earth.

Answer 2

The size of a comet does not necessarily determine its crater diameter. Crater diameter is influenced by various factors such as impact velocity, angle, and composition of the surface being impacted. Therefore, a smaller comet could potentially create a larger crater than a larger comet if it were to impact with higher velocity and at a steeper angle.