Status: Study 1995. Thrust: 7.84 kN (1,763 lbf). Gross mass: 18,500 kg (40,700 lb). Specific impulse: 291 s.
5 metric tons would be powered by solar arrays with a maximum beginning-of-life average power rating of 3.8 kW. More than three metric tons of propellants would be available for a mission duration of up to five years at an altitude of 600 km.