WIKIARCHIVES.SPACE

STS-35 Astronomy Laboratory 1 (ASTRO-1) telescopes are documented in the payload bay (PLB) of Columbia, Orbiter Vehicle (OV) 102, and backdropped against the cloud-covered surface of the Earth. In the center of the frame are three ultraviolet telescopes 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 Integrated Radiator System (IRS) (silver box at left), the Optical Sensor Package (OSP) (above IRS), the Ultraviolet Imaging Telescope (UIT), and the Star Tracker (S TRK) (at far right). In the foreground and in front of the unpressurized spacelab pallet (U-pallet) is the igloo, a pressurized cylindrical container that houses subsystems that provide such services as power, telemetry and commands to the instruments.