YR24 is estimated to be less than a third the size of Apophis. Side note, we’re only about 4 years away from <i>that</i> asteroid coming within 32,000 km of the planet, closer than the orbiting height of geosynchronous satellites.<p>If YR24 were to hit the planet, the article puts the impact energy on par with a 10 MT nuclear bomb, or similar to the Tunguska event:<p>“Everything within three or four kilometers would be incinerated,” Tonry says. “Everything out to maybe 10 kilometers is smashed. […] There would be a huge fireball that would start fires out to 15 kilometers, something like that. It would kill a lot of people if they haven’t moved out of the way.”<p>So, not nothing, but also not an existential threat even for most individual nation states, and also a 98% chance of being entirely uneventful.<p><a href="https://en.m.wikipedia.org/wiki/99942_Apophis" rel="nofollow">https://en.m.wikipedia.org/wiki/99942_Apophis</a><p><a href="https://en.wikipedia.org/wiki/Tunguska_event" rel="nofollow">https://en.wikipedia.org/wiki/Tunguska_event</a>