Hélios 1B

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General

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

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End of life

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

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External resources

sat-index articles

Technical data

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Specifications

Prime contractor	Matra Marconi Space (under control of CNES)
Platform	Spot Mk 2
Mass at launch	2544 kg
Mass in orbit
Dimension
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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