Hélios 1B & Clémentine

Launch Time
Fri Dec 03, 1999 16:22 UTC

Last flight of Ariane 40. Flight V123.


Ariane 40
Image Credit: Arianespace
Status: Retired
Liftoff Thrust: 3,034 kN
Payload to LEO: 5,000 kg
Payload to GTO: 2,000 kg
Stages: 3
Strap-ons: 0
Rocket Height: 58.72 m

Mission Details

Hélios 1B

The Hélios 1B was a French military photo-reconnaissance satellite in which Italy and Spain also participated. It was launched from the Guiana Space Centre, French Guiana on 3 December 1999 at 16:22:00 UTC. The spacecraft rode aboard an Ariane 4 rocket which also carried the French military reconnaissance satellite, Clémentine. Due to power supply failures, it had to be left to disintegrate in 2005.

It has been replaced by Hélios 2A, launched on December 2004 on an Ariane 5 rocket.

Payloads: 1
Total Mass: 2,540.0 kg
Geostationary Transfer Orbit


Clémentine is a small satellite built by Alcatel Space (now Thales) for the French DGA, ostensibly "to study the Earth's radio-electrical environment from space."

It is a successor to the Cerise satellite.

Payloads: 1
Total Mass: 50.0 kg
Geostationary Transfer Orbit


ELA-2, Guiana Space Centre, French Guiana, France



68th orbital launch attempt


111th mission
8th mission of 1999
106th successful mission
50th consecutive successful mission

Ariane 4

92nd mission
8th mission of 1999
89th successful mission
50th consecutive successful mission