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Fact Sheet:

LAUNCH DATE: 09-Aug-1975 01:48 UT  
MISSION END:25-April-1982
LAUNCH VEHICLE:Thor Delta
LAUNCH MASS:278 kg
MISSION PHASE: Archive
ORBIT:
The orbit of Cos-B was roughly 100 000 km with a period of 37 hours. This eccentric orbit was chosen to ensure that for most of the time the satellite was outside the Earth's radiation belts.
ACHIEVEMENTS:
Creation of the 2CG Catalogue that contained about 25 gamma-ray sources out of 30 observations made during the first three years.
THE MISSION:
Cos-B was ESA's first satellite dedicated to a single experiment. Its scientific mission was to study in detail the sources of extra-terrestrial gamma radiation at energies above about 30 MeV. The originally foreseen duration of the mission was two years, but in fact Cos-B functioned successfully for 6 years and 8 months. During this time an extensive survey of the Galaxy was made in the energy range 50 MeV to 5 GeV.
 
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