(Thor-Delta 1A, TD-1)
(1970s European observatory-satellite with UV telescopes)
TD-1A (for Thor-Delta 1A, aka TD-1) was a space observatory
satellite launched by
the European Space Research Organization (ESRO) in 1972 for the
purpose of surveys and operational until 1975.
It included UV spectrometers as well as instruments for
cosmic rays, X-rays, and soft gamma rays.
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