Spacelab

This photograph was taken during the integration of the Astro-1 mission payloads at the Kennedy Space Center on March 20, 1990, showing the Broad Band X-Ray Telescope (BBXRT) at the left, as three telescopes for the Astro-1 Observatory are settled into the Orbiter Columbia payload bay. Above Earth's atmospheric interference, Astro-1 would make precise measurements of objects such as planets, stars, and galaxies in relatively small fields of view and would observe and measure ultraviolet radiation from celestial objects. The Astro-1 used a Spacelab pallet system with an instrument pointing system and a cruciform structure for bearing the three ultraviolet instruments mounted in a parallel configuration. The three instruments were: The Hopkins Ultraviolet Telescope (HUT), which was designed to obtain far-ultraviolet spectroscopic data from white dwarfs, emission nebulae, active galaxies, and quasars; the Wisconsin Ultraviolet Photo-Polarimeter Experiment (WUPPE) which was to study polarized ultraviolet light from magnetic white dwarfs, binary stars, reflection nebulae, and active galaxies; and the Ultraviolet Imaging Telescope (UIT), which was to record photographic images in ultraviolet light of galaxies, star clusters, and nebulae. The star trackers that supported the instrument pointing system, were also mounted on the cruciform. Also in the payload bay was the Broad Band X-Ray Telescope (BBXRT), which was designed to obtain high-resolution x-ray spectra from stellar corona, x-ray binary stars, active galactic nuclei, and galaxy clusters. Managed by the Marshall Space Flight Center, the Astro-1 observatory was launched aboard the Space Shuttle Orbiter Columbia (STS-35) on December 2, 1990.