Japanese spacecraft fired cannonball into asteroid

boing
20

Hayabusa2 launch mass 609 kg
SCI mass 2.5kg == 0.0041 of Hayabusa2 mass
SCI speed 2km/s
Recoil speed = 2000*0.0041 = 8m/s
162173 Ryugu escape velocity = 0.24 m/s at 1000 metres from the center of the asteroid

So yeah its going to be pushed back at 30 times escape velocity at the absolute best (1000 metres is very low) and you need to fire rockets to get back into orbit.

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