Thor Delta 1A (TD-1A)
TD-1A in the integration hall at the Eurpoean Space Research and Technology Center (ESTEC). (Credit: ESRO)
Lifetime: March 1972 - May 1974 (operations ceased)
Portion(s) of spectrum studied: ultraviolet, X-ray, gamma ray
Operator (primary): European Space Research Organization
Primary Science
The primary science goal of TD-1A was to make an all-sky ultraviolet survey of the sky. Onboard X-ray and gamma-ray detectors would make all-sky surveys as well.
Science Highlights
- Completed two full scans of the whole sky, mapping about 95% of the full sky.