Seconded. There's a trilogy starting with The Last Policeman with a similar scenario: kilometer-scale asteroid projected to hit in about a year. To a first app

Seconded. There's a trilogy starting with The Last Policeman with a similar scenario: kilometer-scale asteroid projected to hit in about a year. To a first approximation everyone just says "Well, fuck, guess we're going to die." Thinking about the ways that seemed unrealistic and how I thought it would go instead, Seveneves turned out a lot more like it (though with exciting-story elements injected, and also in Seveneves they're starting from maybe a decade ahead of us in space tech). (The Last Policeman is still interesting in other ways.) Egan's Diaspora is another good match, with an astrophysical cataclysm instead of a merely planetary one. It happens to a much more advanced future society, though.