Set of three ultraviolet telescopes flown on the Space Shuttle in December 1990 (STS-35) and March 1995 (STS-67). Included the 0.5 m Wisconsin ultraviolet photo-polarimeter experiment, a 38 cm ultraviolet imaging telescope and the 90 cm Hopkins ultraviolet telescope. Astro-1 also carried a broad-band x-ray telescope. Astro-1 observed some 135 targets, including Comet Austin