English: The Astro-1 telescopes in Columbia's payload bay during the STS-35 mission.
During the STS-35 mission, the Astronomy Laboratory 1 (ASTRO-1) payload, in its onorbit operating configuration, is documented in the payload bay (PLB) of Columbia, Orbiter Vehicle (OV) 102. In the center of the frame, three ultraviolet telescopes are mounted and precisely coaligned on a common structure, called the cruciform, that is attached to the instrument pointing system (IPS). Visible on the cruciform are the Wisconsin Ultraviolet Photo-Polarimeter Experiment (WUPPE) (top left), the Hopkins Ultraviolet Telescope (HUT) (behind WUPPE), the Integrated Radiator System (IRS) (silver box on right), and the Optical Sensor Package (OSP) (above IRS). In the foreground and in front of the unpressurized spacelab pallet (U-pallet) is the igloo, a pressurized cylindrical container that houses the subsystems that provide such services as power, telemetry and commands to the instruments. On top of the vertical stabilizer (tail), the Shuttle Infrared Leeside Temperature Sensing (SILTS) system i