Beschreibung : The TD-1 satellite carried seven experiments devoted to astophysical studies. Its scientific mission was to make a systematic sky survey in the ultraviolet and high-energy regions of the spectrum. The experiments were divided into two main categories: five experiments--measuring ultraviolet, x and gamma rays, and heavy nuclei--scanned strips of the sky; the other two viewed along the sun-pointing x axis and measured solar x and gamma rays.
Two and one-half complete scans of the celestial sphere were completed before the attitude control was lost in May 1974 following exhaustion of the on-board gas supply. Despite intermittent tape recorder failure, data coverage was achieved over 95 percent of the celestial sphere and many areas were observed during two or three separate scans.
Vandenberg post stamp and satellite ESRO.

USA 552 - picture enhanced ?

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TD 1A (SATELLITE) · THOR DELTA N