The IRES from Leonardo is a Two-Axis Infrared Earth Horizon Sensor that has an accuracy of 0.02 (Degree Bias Error) and 0.05 (Degree random error (3s)). It has an output data rate of 10 Hz. This sensor has been used in several successful missions such as the Artemis, EUTELSAT24, and OLYMPUS. It has been also installed in the latest generation of the GALILEO satellite constellation. This sensor has a mass of 2.5 Kg and allows meeting transfer orbit operations of different launchers because of its extended acquisition and operational capabilities. It requires a supply voltage of 24-50 V and has a power consumption of up to 4 W. The earth/horizon sensor measures 169.9 x 163.8 x 156 mm and is ideal for use in three-axes stabilized spacecraft operating in GEO (Geostationary Earth Orbit) and MEO (Medium Earth Orbit).
