Sodom and Gomorah revisisted

I recently watched a documentary on the events of Sodom and Gomorrah as they may be related to the Kofels Impact.
A planisphere dating back to 700 BC was found in 1850 by an archaeologist in the library of a royal palace in Nivea that is now known as Iraq. The tablet is said to be an astronomical observation of the fall of an asteroid which took place in 3123 BC. The recorded projection of the asteroid is amazingly accurate, within 1 degree. The projection puts the asteroid in the path of Kofels, Austria. The recorded observation suggests that the asteroid is one that orbits close to the earth and was 1 kilometer in diameter. The angle of decent had it striking the mountain of Gamskogel causing it to explode and the fireball created damage to the Kofels valley which is observed by modern geologists. The resulting plume of the asteroid would have been about 400 degrees Fahrenheit, enough to ignite and disintegrate everything in it's path, which would have been the towns of Sodom and Gomorrah. The resulting impact would have also caused widespread changes in climates as suggested by northern Africa was once a lush tropical environment that turned into desert.
I believe the show is still running an NatGeo if you are interested.