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Pegsat (with SECS attached) [NASA]

The Pegsat spacecraft was the first to be launched using the privately-developed winged Pegasus rocket booster released from an aircraft in flight.

The project involved DARPA, DoD, and NASA. The three-function payload included instrumentation to help establish the launch vehicle payload environment by measurement of variations in launch vehicle and spacecraft attitude, temperature, pressure, structural loading and vibrations. It also ejected a small Navy experimental communications relay satellite (SECS). The third function was a NASA pair of barium chemical release experiments. The experiments were part of a NASA plan to recover some of the science objectives lost when the CRRES spacecraft was reconfigured from a Shuttle launch to an Atlas-1 launch. The interactions of the released chemicals with the magnetic and electric fields in the Earth's magnetosphere and ionosphere were to be observed from a network of ground sites in central Canada and the United States. Both releases, on 16 April and 25 April 1990, were successfully observed by the western stations.

Nation: USA
Type / Application: R&D
Operator: NASA, Orbital Sciences Corporation (OSC)
Contractors: ?
Equipment: Barium release experiment
Configuration: ?
Propulsion: ?
Power: Batteries
Mass: 178 kg
Orbit: 500 km × 682 km, 94.1
Satellite COSPAR Date LS Launch Vehicle Remarks
Pegsat 1990-028A 05.04.1990 Ed, B-52, RW04/22 Pegasus with SECS


  • NSSDC Master Catalog: PEGSAT