It missed us by 9 days

Honestly I am more worried about a magnetic field flip of the earth. Which evidence is pointing to that we are in the beginning phases of. The Earth's magnetic field weakens and develops holes that let radiation through to the surface and it also dramatically affects the weather and average temperatures. According to geologic and ice core records we are due for it to happen. Temperature increases and dramatic weather also precede such an event. 
A super flare from the Sun during a magnetic flip would be a major impact on the Biosphere.