Near miss by Asteroid 2005 YU 55 will occur at 6:28 p.m. EST (2328 GMT) Tuesday

[JimBowie1958]

1,300 feet in diameter would seriously fuck up your day. Likely kill everything around the impact zone for 500-800 miles or more. Sends the planet into a decade long ice age.

Not really:

Here is the results for a persons standing 500 miles away from the impact site

Calculated Results

This is 100 miles away:

Calculated Results

Within 40 miles people start to be in serious trouble.

Calculated Results

This for it hitting 400 miles offshore in 6k meter deep water.

Calculated Results

Not exactly a picnic, but not the 800 miles of devestation you are quoting, nor the civilization ending tsumani in the post below.

Hmm, wonder how many asteroid strikes they had to use to get that data.

 

[martybegan]

1,300 feet in diameter would seriously fuck up your day. Likely kill everything around the impact zone for 500-800 miles or more. Sends the planet into a decade long ice age.

Not really:

Here is the results for a persons standing 500 miles away from the impact site

Calculated Results

This is 100 miles away:

Calculated Results

Within 40 miles people start to be in serious trouble.

Calculated Results

This for it hitting 400 miles offshore in 6k meter deep water.

Calculated Results

Not exactly a picnic, but not the 800 miles of devestation you are quoting, nor the civilization ending tsumani in the post below.

Hmm, wonder how many asteroid strikes they had to use to get that data.

its mostly derived. The basic formulae used to estimate it are pretty easy. For a given mass and a given velocity hitting the atmosphere, then the earth/water a given amount of energy is released, which results in the following:

It scales well with nuclear detonations, which we have plenty of data on.