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International Ultraviolet Explorer


Designation 10637 / 78012A
Launch date 26 Jan 1978
Country of origin International
Operator NASA + ESA
Mission Scientific: UV astronomy
Perigee/Apogee 30252/41315 km
Inclination 34.5°
Period 1435.9 min
Launch vehicle Thor Delta #132
Mass at launch 671 kg

A joint NASA/ESA/SERC (Search and Engineering Research Council) observatory satellite designed for ultraviolet spectrometry of cosmic UV sources. ESA's contribution was the construction of the spacecraft's solar panels and a ground station at Villafranca, Spain.

On 1st October 1995 the primary control of the still operating spacecraft was transferred from NASA to ESA. This because of NASA's cost reduction efforts.

External resources


End of life

Out of service 30 Sep 1996
Cause planned end of exploitation

Technical data


Mass at launch 644 kg
Length 4.17 m
Width 1.45 m
Solar array 45 m²
Stabilization 3-axis
Design lifetime 3 years

Payload: 0.45 m diameter UV telescope + 4 spectrographs

Telemetry: 138.86 & 2249.0 MHz
Command: 149.0 MHz

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