thumb|Sud-Aviation Belier rocket family.
The Éridan is a two-stage French sounding rocket, which results from the use of the Stromboli engine (also used on the Dragon and Dauphin) for the first and second stages.
It belonged to a family of solid-propellant rockets that also encompasses the Belier, the Centaure, the Dragon, and the Dauphin. As the most powerful version of this series it could lift payloads from to up to altitudes of to a maximum of .
Its ascent time is between 230 and 350 seconds. Total thrust was 90.00 kN (20,232 lbf) with a gross mass of to depending in payload. The rocket had a height of , a diameter of and a span of .