They have an open websocket to an Asteroid Landing five-layer Neural Network. The lander sends images back in real time and the earth-borne NN sends it telemetry adjustments in BSON.

Make a sturdy lander and just crash into it.

https://spaceflightnow.com/2018/06/20/asteroid-ryugu-reveale... says Ryugu only rotates once every 7.6 hours.