Pegasus HAPS – Orbital Sciences Corporation Family: Pegasus meters Length: 15.5 meters Diameter: 1.28 meters Launch Mass: 18 Low Earth Orbit Capacity: 250 The Pegasus HAPS was manufactured by Orbital Sciences Corporation with the first launch on 1991-07-17. Pegasus HAPS has 2 successful launches and 0 failed launches with a total of 2 launches. 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 HAPS variant adds a Hydrazine Auxiliary Propulsion System maneuvering stage. Manufacturer Orbital Sciences Corporation is a Commercial USA entity that was founded in and is administered by . Orbital Sciences Corporation has 51 successful launches and 4 failed launches with a total of 55 launches.