STS-85 was a Space Shuttle Discovery mission to perform multiple space science packages. It was launched from Kennedy Space Center, Florida, on 7 August 1997. The deployment and retrieval of a satellite designed to study Earth's middle atmosphere along with a test of potential International Space Station hardware highlighted NASA's sixth Shuttle mission of 1997. The prime payload for the flight, the Cryogenic Infrared Spectrometers and Telescopes for the Atmosphere-Shuttle Pallet Satellite-2 (CRISTA-SPAS-2) made its second flight on the Space Shuttle (previous flight STS-66 in 1994) and was the fourth mission in a cooperative venture between the German Space Agency (DARA) and NASA.
During the flight, Davis used Discovery's robot arm to deploy the CRISTA-SPAS payload for about 9 days of free-flight. CRISTA-SPAS consists of three telescopes and four spectrometers that measured trace gases and dynamics of the Earth's middle atmosphere. Davis also operated the robot arm for CRISTA-SPAS retrieval. The Shuttle Pallet Satellite (SPAS) on which the scientific instruments were mounted is a self-contained platform that provides power, command, control and communication with Discovery during free-flight.
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