OSO 8

OSO 8 (for Orbiting Solar Observatory 8) was a NASA satellite in service from 1975 to 1978, primarily to observe the Sun, but also carrying out X-ray observations of other astronomical targets. Instruments:

• "Chromosphere Fine-Structure Study".
• "Cosmic X-Ray Spectroscopy".
• "EUV From Earth and Space".
• "High-Energy Celestial X-rays".
• "High-Resolution Ultraviolet Spectrometer Measurements".
• "High-Sensitivity Crystal Spectroscopy of Stellar and Solar X-rays".
• "Mapping X-Ray Heliometer".
• "Soft X-ray Background Radiation Investigation".