Hélios 2A, PARASOL & Others

The Helios 2 system includes Helios 2A and Helios 2B, both of which are European military observation satellites used by France, Belgium, Spain, and Greece. Helios 2B was launched five years later on December 18, 2009, carried also by an Ariane 5. The two satellites are identical. They carry a Thales-built high-resolution visible and thermal infrared instrument with 35 cm resolution, and an Airbus-built medium-resolution instrument.

Essaim (swarm, in French) is a French military reconnaissance microsatellite constellation. Its main purpose is to collect and map signals intelligence across the world. The DGA describes it as a "vacuum cleaner for [radio] waves". Essaim is a constellation of four 120 kg microsatellites (including one spare) in low earth orbit. They are demonstration models which were supposed to last three years. They fly separated by a few hundred kilometers. Missions are designed by the Celar (Centre d'électronique de l'armement) in Bruz, near Rennes and are uploaded from CNES in Toulouse to the constellation. Collected data follows the same path in reverse order.

PARASOL (Polarization & Anisotropy of Reflectances for Atmospheric Sciences coupled with Observations from a Lidar) is a French-built Earth-observing research satellite. It carries an instrument called POLDER which studies the radiative and microphysical properties of clouds and aerosols.

NanoSat-1 (also referred to as NanoSat-01) is a low-cost technology demonstration nanosatellite of INTA (Instituto Nacional de Tecnica Aerospacial), the Spanish Space Agency, Madrid. https://en.wikipedia.org/wiki/Instituto_Nacional_de_T%C3%A9cnica_Aeroespacial