Detected 3.5 hours before impact

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Not enough time to do anything about it, but then it was only a meter or so wide. At that side it was probable to be harmless. Ten times bigger, though, it starts to get worrisome. A hundred time the diameter, you need to stand up, take notice and consider launching the nukes.

 

This was not the first impactor to be detected prior to impact. In March, a 2-meter asteroid was detected 2 hours prior to impact.

 

NASA program predicted impact of small asteroid over Ontario, Canada