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TD-1A
TD-1A, or Thor-Delta 1A, was a European astrophysical research satellite which was launched in 1972. Operated by the European Space Research Organisation, TD-1A made astronomical surveys primarily in the ultraviolet, but also using x-ray and gamma ray detectors. ==Spacecraft== TD-1A was named after the Thor-Delta series of rockets, a derivative of which was used to launch it. It was a satellite which measured by by . The spacecraft was three-axis stabilised, with sun sensors used to maintain a constant attitude with respect to the Sun.
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