To the question
Hagoromo was a ~36cm nano satellite that was deployed by Hiten while Hiten was in a highly elliptical orbit around the earth, in 1990.
How was this done exactly? Was it purely ballistic capture (which still requires a tiny amount of thrust I think?) or more of a propulsive maneuver to enter into a lunar orbit?
What kind of propulsion and attitude control (if any) did Hagoromo actually have?
the answer is:
A solid propellant (KM-L) retrorocket with a mass of 4 kg was mounted inside the spacecraft for orbit insertion.
Question: How could a tiny 36 cm nanosatellite with a 4 kg solid propellant rocket inside maintain attitude control throughout the burn in order execute an orbital insertion?