 The autonomous landing system was intended to place the vehicle on the ground within 3,000 ft (0.9 km) of its intended target.The Deorbit Propulsion Stage was designed by Aerojet GenCorp under contract to the Marshall Space Flight Center.The module was to be attached to the aft of the spacecraft at six points, and is 15.5 ft (4.72 m) long and 6 ft (1.83 m) wide.