OSO 8 [Hughes]
The objectives of the OSO (Orbital Solar Observatory) satellite series were to perform solar physics experiments above the atmosphere during a complete solar cycle and to map the entire celestial sphere for direction and intensity of UV light, X-ray radiation, and gamma-ray radiation. The OSO 8 platform consisted of a sail section, which pointed two experiments continually toward the sun, and a wheel section, which spun about an axis perpendicular to the pointing direction of the sail and carried five experiments. Gas jets and a magnetic torquing coil performed attitude adjustment. Pointing control permitted the pointed experiments to scan the region of the solar disk in a 40- by 40-arc-min to 60- by 60-arc-min raster pattern. In addition, the pointed section was capable of being commanded to select and scan a 1- by 1-arc-min or 5- by 5-arc-min region anywhere on the solar disk. The spacecraft had a mission life of more than a year, but exceeded that by transmitting data until Sept. 26, 1978, outliving all other OSOs by at least six months.
OSO 8 carried following instruments:
Nation: | USA |
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Type / Application: | Solar observatory |
Operator: | NASA |
Contractors: | Hughes |
Equipment: | |
Configuration: | HS-331 |
Propulsion: | |
Power: | Solar cells, batteries |
Lifetime: | 1 year |
Mass: | 1066 kg |
Orbit: | 539 km × 553 km, 32.9° |
Satellite | COSPAR | Date | LS | Launch Vehicle | Remarks | |
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OSO 8 (OSO I) | 1975-057A | 21.06.1975 | CC LC-17B | Delta-1910 | ||
OSO J | - | cancelled | ||||
OSO K | - | cancelled |