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Hélios 1B


Designation 25977 / 99064A
Launch date 3 Dec 1999
Country of origin France
Mission Military: reconnaissance
Perigee/Apogee 660/682 km sun-synchronous
Inclination 98.1°
Period 98.4 min
Launch vehicle Ariane V124

With this satellite the revisit period of the system will be about 1 day. Same orbit but 180 degrees separation

End of life

Out of service Nov 2004
Cause Following a power failure, was lowered to 640 km orbit

External resources

sat-index articles

Technical data


Prime contractor Matra Marconi Space (under control of CNES)
Platform Spot Mk 2
Mass at launch 2544 kg
Mass in orbit  
Stabilization 3-axis
DC power 2200 W
Design lifetime 5 years

The satellite is identical to Helios 1A except it has a static memory storage and two 120 Gbit magnetic recorders.

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