This from wiki on the SCI package (a compact “cannon” designed to be deployed by Hayabusa 2 and then explode, thereby creating a fast-moving shaped copper charge.)
The spacecraft carried a small carry-on impactor (SCI). It was dropped off [of] Hayabusa 2 on to an asteroid and detonated. The explosion created a copper explosively formed penetrator, which hit the asteroid with a velocity of 2 km/s. The crater created by the impact was a target for further observations by the onboard instruments. The shaped charge consisted of 4.5 kg of plasticized HMX and a 2.5 kg copper liner.
