Small Planet Elfen Lied

https://cdn.discordapp.com/attachments/264094411389009920/474322517738258463/unknown.png
Length: 2,767 miles
Width: 51 miles
So assuming it took 8 seconds to reach space
2,767 miles in 8 seconds= 345.875 miles per second= mach 1622.83
next you need to find volume
for the most part you can just google "find volume of" whatever and you'll get a calculator you can enter data into
so the vectors are for the most part gian cylinders
https://www.mathopenref.com/cylindervolume.html
so what you need here is the height and the radius
the height in this case will be the length and the radius will be half your width
So since the width was 51 miles, the radius is 25.5 miles
So the volume is 5,652,484 miles cubed
ok so keep that in mind
we now have the speed. We have the volume. Now we need the find the density to find the weight.
this is kind of the tricky part
since vectors aren't real world objects we don't have an exact density or mass to use
but similar to say ravens soul self we know they can be used for punching things
and so on
so we can probably lowball it
So we're going to assume they have the density of a human, which seems fair
https://www.aqua-calc.com/calculate/volume-to-weight

So you should get 23800000000000000000 kilograms
https://www.1728.org/energy.htm
So put that into the mass here and put the speed (which is 345.875 miles per second)
And you should get 881230000000000 megatons = 881.23 exatons of TNT