> what's the chance of something like this happening with a much bigger asteroid.
Negligible. As I noted upthread, objects large enough to be do significant damage if they hit Earth and are on trajectories that could bring them close to Earth are routinely spotted years in advance.
Negligible. As I noted upthread, objects large enough to be do significant damage if they hit Earth and are on trajectories that could bring them close to Earth are routinely spotted years in advance.