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According to this article, an asteroid came dangerously close to the Earth. The asteroid was roughly the size of a football field.

What would the result of this asteroid be if it had impacted square on the Earth's surface? If negligible, at what mass does an asteroid impact become critical?

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    $\begingroup$ You can estimate the size of the crater from kinetic energy arguments & get a feel for the damage that way. $\endgroup$
    – Kyle Kanos
    Commented Sep 20, 2019 at 23:22
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    $\begingroup$ Some rough comparisons are given at the end of the Wikipedia article: en.wikipedia.org/wiki/2019_OK ("2019 OK" is the provisional designation of the asteroid). $\endgroup$
    – Chiral Anomaly
    Commented Sep 21, 2019 at 0:18

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Asteroid 2019 OK is about the size of a football field, and was travelling about 54,379 miles per hour, with closest approach of about 44,300 miles. If it would have hit Earth it would have been a city killer, with about 30 times the energy of the Hiroshima bomb.

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