User blog comment:Xx Diictodon xX/Extinction Event and so much more/@comment-4650748-20160110021652

Considering someone already gave this the category ASB(I can see why, Gaspra never had a 2005 flyby) you can probably go nuts and add it in.

Out of interest, though, I decided to calculate what effect the impact would have:
 * Distance from Impact: 1000.00 km ( = 621.00 miles ) (Just for a milestone)
 * Projectile diameter: 6.26 km ( = 3.89 miles ) (The average diameter, the mean from all 3 dimensions)
 * Projectile Density: 2700 kg/m3 (Accurate)
 * Impact Velocity: 19.80 km per second ( = 12.30 miles per second ) (Its average orbital speed)
 * Impact Angle: 45 degrees (The average for all)
 * Target Density: 1000 kg/m3 (Average)
 * Target Type: Liquid water of depth 1.6 km ( = 1.0 miles ), over crystalline rock. (Average Gulf of Mexico depth)


 * Frankly, it's disastrous. An impact like this happens once every 39 million years, so it's quite destructive.


 * The crater opened in the water has a diameter of 72.8 km ( = 45.2 miles ).If it hit within 50 miles of the coast, the coastal towns, and possibly further inland, are wiped out entirely, almost immediately. It's depth is over a kilometer, and iniially, it penetrates into the mantle a bit.


 * Assuming it hits 100 kilometres off the coast, it takes just 20 seconds for the Magnitude 9.3 Earthquake to hit, wiping out the towns easily. From even this far away, the fireball is 100 miles in diameter and appears almost 200 times brighter than the sun, giving you third degree burns easily(killing more people) From even a megameter away, it still has a diameter a few miles wide and is brighter than the sun.


 * From 100 kilometres, you would need to wait only 2,4 minutes until the ejecta arrives, which would be 25 metres thick. Within 10 minutes, the ejecta has gone over a megametre and will soon blanket the ground under 2 and a half centimetres.


 * Meanwhile, the sound would deafen you at 135 decibels, but frankly, this would be one of the least concerning things. (1 megametre = 92 deciels)


 * But, despite this, it would be a mass extinction event confined largely to the continent.