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Designation 14095 / 83051A
Launch date 26 May 1983
Country of origin Europe
Mission Scientific: astronomy
Perigee/Apogee 340/191878 km
Inclination 72.5°
Period 5442.1 min
Launch vehicle Thor Delta #169
Mass at launch 510 kg

Astronomy satellite designed to map the position and characteristics of cosmic X-ray sources. The observatory performed some 2000 observations during its operational lifetime.

End of life

Out of service 9 Apr 1986
Decay 6 May 1986

External resources



Technical data


Prime contractor MBB
Mass at launch 500 kg
Payload mass 120 kg
Diameter 2.1 m
Height 1.35 m
Solar array 1.85 x 2 m
Stabilization 3-axis
DC power EOL: 260 W
Design lifetime 2 years
Telemetry/data S-band (6 W): 8 kbps

Low energy experiment: 2 grazing incidence (imaging) telescopes

Field of view
Collecting area 90 cm²

Medium energy experiment: 8 proportional counters

Field of view 1.5°
Collecting area 1800 cm²

Gas scintillator spectrometer

Field of view 1.5°
Collecting area 200 cm²
X-ray energy rate low energy 0.04-2 keV
medium energy 1.5-50 keV
spectrometer 2-80 keV

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