Given the rather important address that would show on police systems, can you just imagine the number of police vehicles that would race to the space centre? I could also imagine this would quickly show up on gov agency radars, like the FBI...
This poor astronaut will go down in history for this error, and probably never live it down, no matter where he goes. Conversations would go something like:
"We're having an astronaut come to give a speech at our convention."
"Who is it?"
"I forget his name, but he's the one who accidently dialed 911 that time from the space station."
"Ah, that would be André Kuipers...."