Diapason D-1A - Space launch mission detailed information
17 FEB 1966
National Center of Space Research
Diapason was a small cylindrical satellite, 20 cm long and 50 cm in diameter which was used for making geodetic measurements.
The Diamant rocket (Diamant is French for "diamond") was the first exclusively French expendable launch system and at the same time the first satellite launcher not built by either the United States or USSR. As such, it has been referred to as being a key predecessor for all subsequent European launcher projects.