STS-51 was a Space Shuttle Discovery mission that launched the Advanced 10 Technology Satellite (ACTS) in September 1993. The flight also featured the deployment and retrieval of the SPAS-ORFEUS satellite and its IMAX camera, which captured spectacular footage of Discovery in space. A spacewalk was also performed during the mission to evaluate tools and techniques for the STS-61 Hubble Space Telescope servicing mission later that year.

The Space Shuttle is a retired, partially reusable low Earth orbital spacecraft system operated from 1981 to 2011 by the U.S. National Aeronautics and Space Administration (NASA) as part of the Space Shuttle program. Its official program name was Space Transportation System (STS). Five complete Space Shuttle orbiter vehicles were built and flown on a total of 135 missions from 1981 to 2011.

• Space Shuttle

  Human Spaceflight
  The Space Shuttle program was the fourth human spaceflight program carried out by the National Aeronautics and Space Administration (NASA), which accomplished routine transportation for Earth-to-orbit crew and cargo from 1981 to 2011.
  Program infoProgram wiki

• Frank L. Culbertson Jr.
  Commander
• William F. Readdy
  Pilot
• Carl E. Walz
  Mission Specialist
• Daniel W. Bursch
  Mission Specialist
• James H. Newman
  Mission Specialist