73 Gigatonnes of TNT upon collision could cause how many casualties?

So, after going through a some rough calculations, I figured my earlier question ran into a few problems regarding the final velocity of the asteroid. I pulled the mathematics a bit incorrect, so I dumbed it down to a speed of 40,264.06 m/s at final velocity. The Delta v, though is 26,264.06 m/s, and the initial speed was 14,000 m/s, and I still preserve the same angle and initial population numbers. The question I mentioned earlier is free to be erased now. Oh, and the number of 13 billion humans is from a guesstimate of population growth from 2100 to 2476 using a balanced 0.04% growth rate and starting from a recent UN estimate regarding the initial quantity of 11.2 billion people. So, given that this is 1999 FN53, which is a 900 metre in diameter asteroid, and it has 360 billion kg of mass (obtained from Russia's equivalent of NASA's Small Body Database), and those are factored in. Now.....it crashes 2 km off the coast of Guam, but the question is how much of the globe's population (if that number is large enough) would perish?

posted over 8 years ago

Future Historian‭

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