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Proba 1


Designation 26958 / 01049B
Launch date 22 Oct 2001
Country of origin Europe
Mission Remote sensing
Perigee/Apogee 568/638 km
Inclination 97.9°
Period 97 min
Launch vehicle PSLV #6

Total cost: $14.5 million. Conducts autonomous science observations on requests from Earth stations.

The higher orbit for Proba was achieved by firing the reaction control thrusters of the PSLV's fourth stage.

Still operating in 2012 after a software fix to its startracker. Still operational on its 20th birthday.

External resources


sat-index articles

Technical data


Prime contractor Verhaert Design & Development (Kruibeke, Belgium)
Platform MiniSIL
Mass at launch 94 kg
Mass in orbit  
Payload mass 25 kg
Dimension 0.8 x 0.6 x 0.6 m
Solar array  
DC power  
Design lifetime 3 years

Has a 25 m resolution spectrometer named CHRIS (Compact High resolution Imaging Spectrometer; 14 kg; designed and developed by Sira Electro-Optics of the UK), a radiation (SREM) and dust (DEBIE) detectors and 2 micro cameras (WAC (18 m resolution) and HRC (8 m resolution)).

The star tracker is said to be the first capable of adjusting for the relativistic aberration (caused by the fact that the satellite is moving)

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