The four Elisa microsatellites were launched aboard the same Soyuz rocket, from Kourou, on 17 December 2011. They were placed in low-Earth orbit, a few kilometres apart from each other.
Illustration: the four Elisa satellites in orbit
Each satellite weighs about 130 kg; they were designed around the Myriade spacecraft bus, used for their scientific missions.
Installing the Elisa satellites on the Soyouz rocket’s ASAP (Arianespace System for Auxiliary Payloads)
© CNES/ESA/Arianespace/Optique Vidéo CSG/L Mira, 2011