sentences:  This required removing a large volume of surface material with a substantial impactor.For this purpose, "Hayabusa2" deployed on 5 April a free-flying gun with one "bullet", called the Small Carry-on Impactor (SCI); the system consists of a copper projectile shot to the surface by an explosive propellant charge.Following SCI deployment, "Hayabusa2" also left behind a deployable camera (DCAM3) to observe and map the precise location of the SCI impact, while the orbiter maneuvered to the far side of the asteroid in order to avoid debris from the impact.