[ortusdux]

I used the Earth Impact Effects Program calc w/ 90 deg impact, rock asteroid, and 15km/s.

https://impact.ese.ic.ac.uk/cgi-bin/crater.cgi?dist=100&diam...

4 mile crater, 2300 MT of TNT equiv. so about 45 Tsar Bombas.

[H8crilA]

Where did you find the mass/size?

[ortusdux]

I had to guess without albedo data, but an H of 19.2 puts it in the 0.4 to 0.5 km range, so 400m could be on the conservative side. If it randomly has an albedo of 0.05, it could be as large as 0.96km

https://cneos.jpl.nasa.gov/tools/ast_size_est.html