SO (Infrared Space Observatory) was a infrared space telescope designed and operated by the European Space Agency (ESA), in cooperation with ISAS and NASA. ISO was designed to study infrared light at wavelengths of 2.5 to 240 micrometers to provide detailed infrared properties of selected Galactic and extragalactic sources.

Mission type: Astrophysics · Orbit: Elliptical Orbit

Rocket: Ariane 44P · Provider: Arianespace