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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 Clementine. Due to power supply failures, it had to be left to disintegrate in 2005.
- (in French) (in English) Guy Lebègue, (trad. Robert J. Amral), « Helios: The Orbiting Spyglass », in Revue aerospatiale, n°118, May 1995.
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