Advanced Photovoltaic Experiment (APEX)Pegasus Orbital Sciences Corporation Launch Status Success Mon ยท Jun 27th, 1994 5:15 PM EDT Location Edwards Air Force Base Air launch to orbit 45 rockets have launched from Air launch to orbit. Rocket Pegasus Length: 16.9 meters Diameter: 1.27 meters First Launch: April 5, 1990 The Pegasus is an air-launched rocket developed by Orbital Sciences Corporation (now part of Northrop Grumman Innovation Systems). Capable of carrying small payloads of up to 443 kilograms (977 lb) into low Earth orbit, the vehicle consists of three solid propellant stages and an optional monopropellant fourth stage. Pegasus is released from its carrier aircraft at approximately 40,000 ft (12,000 m), and its first stage has a wing and a tail to provide lift and attitude control while in the atmosphere. The Pegasus rocket has been launched a total of 4 times with 4 successful and 0 failed launches. Agency Orbital Sciences Corporation Type: Commercial Abbreviation: OSC Country: USA View Rocket Launch Schedule