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IBSS (Infrared Background Signature Survey)
A test of infrared sensor technology for SDIO (Strategic Defense Initiative Organization). The IBSS sensors were mounted on a SPAS-II pallet and used to observe the Space Shuttle's engines firing from a distance away. They also observed a variety of common rocket propellants, including nitrogen tetroxide, MMH, and UDMH, released by three Chemical Release Observation subsatellites launched from Get-Away Special canisters on the Shuttle.
| Shuttle deployment sate | May 1, 1991 |
| Shuttle mission | STS-39 |
| orbit | 245 × 255 km × 57.0° |
| mass | 1,901 kg |
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