Impact

Introduction
On March 22, 1989, the asteroid 4581 Asclepius passed the Earth from a distance of 684,000 kilometers. Although this exceeds the Moon's orbital radius, the close pass received attention at that time, especially since the asteroid passed through the exact position of Earth only six hours earlier. Geophysicists estimate that a collision with Asclepius would have released energy comparable to the explosion of a 600 megaton atomic bomb.

This ATL is one where the asteroid arrived six hours early, crashing into the Earth.