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REX (P89-1A, P94-2)

REX 2 (P94-2) [USAF]

REX (Radiation Experiment) or ISES (Integrated Space Experiment System) is an Air Force Rome Laboratory ionospheric research satellite which will test the effects of the atmosphere on radio transmissions, and will employ GPS for on-board navigation and attitude control.

The spacecraft was gravity gradient stabilized (approx. 5 degrees control) using a 6 m boom and 2.5 kg tip mass. Minor control was provided by three axis torque coils.

The first satellite, REX was launched in 1991 on a Scout-G1 launch vehicle.

A second one, REX 2 was put in orbit in 1995 by an air-launched Pegasus-XL rocket.

Nation: USA
Type / Application: Experimental
Operator: US Air Force (USAF) STP (Space Test Program)
Contractors: DSI (#1), CTA (#2)
Equipment: ?
Configuration: GemStar Bus
Propulsion: ?
Power: 4 deployable fixed solar arrays, batteries
Mass: 86 kg (#1), 110 kg (#2)
Orbit: 770 × 871 km, 89.6 (#1), 803 × 832 km, 89.96 (#2)
Satellite COSPAR Date LS Launch Vehicle Remarks
REX (P89-1A, ISES) 1991-045A 29.06.1991 Va SLC-5 Scout-G1
REX 2 (P94-2) 1996-014A 09.03.1996 Va, L-1011, RW30/12 Pegasus-XL


  • NSSDC Master Catalog: REX

  • NSSDC Master Catalog: REX 2
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