Other Designations: Instrument Unit. Part of: Skylab. Class: Manned. Type: Space station module. Purpose: Used for guidance during orbital insertion only.
Length: 0.91 m (2.98 ft). Basic Diameter: 6.58 m (21.58 ft). Maximum Diameter: 6.58 m (21.58 ft). Mass: 2,065 kg (4,552 lb).