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CHRIS is an AO hyperspectral instrument whose objective is the collection of BRDF (Bidirectional Reflectance Distribution Function) data for a better understanding of spectral reflectances. CHRIS is the prime instrument of the PROBA-1 mission. The technology objective is to explore the capabilities of imaging spectrometers on agile small satellite platforms.


HRC is a black and white camera with a miniaturised telescope. With a high spatial resolution of five metres, HRC can acquire images with an area of 25 square kilometres. As well as studying the Earth, the spacecraft also returns data on its own immediate environment. The telescope is of Cassegrain type with an aperture size of 115 mm and a focal length of 2296 mm.