STS-27 was a space shuttle mission by NASA using the Space Shuttle Atlantis. It was the 27th shuttle mission, and the 3rd for Atlantis, 2nd after the Challenger disaster. It carried a classified payload for the U.S. Department of Defense. Crew Mission parameters Mass: 14,500? kg Payload: Lacrosse 1 (radar reconnaissance) satellite Perigee: 437 km Apogee: 447 km Inclination: 57° Period: 93.4 min Mission highlights The Space Shuttle Atlantis (OV-104), at the time the youngest in NASA's f… (More on Sts-27)