==============================================
I'll show you a way to scale without counting the damn pixels.
I shrunk the pic of Voyager firing it's torp so that the torp looks about the same size in both pictures. I pasted the shrunken voyager pic over the planet. See how dinky voyager is? That asteroid certainly looks bigger than 44 meters! It actually looks like it might be 500 or more meters long.
In this pic you can see approximately how big the glow of the torp is compared to the falcon. Now go back and look at the top picture and see how totally inaccurate your 44meter estimate is.
=============================================
Go ahead and laugh your ass off, that was the only thing i could do.