The coin depicts the ESRO 2B satellite (IRIS), launched in 1968, orbiting Earth. It studied solar X-rays, cosmic radiation, and Earth's radiation belts. The design includes the Utrecht mintmark, Belgian mint master mark, coat of arms of Herzele, the country code BE, and the designer Luc Luycx's initials (LL). The outer ring features the 12 stars of the European flag.