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Proba-1 is a technology demonstrator turned operational Earth observation mission - ESA's smallest, less than a cubic metre in volume. Proba-1's main instrument is the Compact High Resolution Imaging Spectrometer (CHRIS), acquiring 13 square km scenes at 17 m spatial resolution in 18 user-selected visible and near-infrared wavelengths. This agile satellite can also deliver up to five different viewing angles. Nearly 20,000 environmental science images have been acquired.

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Proba-1 view of the Great Pyramids

28 March 2018

A view looking north to south of Egypt's famous Giza Pyramid Complex, as seen by ESA's Proba-1 minisatellite on 6 January 2018.

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Proba-1 images Calanda reservoir

20 April 2017

The blue of the Calanda reservoir amid the rugged landscape of northeastern Spain, as seen by ESA's oldest - and one of its smallest - Earth-observing missions, Proba-1, midway through its 15th year of operations.

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Proba-1

The Project for On-Board Autonomy (Proba) was originally a technology demonstration mission of the European Space Agency, started in mid-1998 and funded within the frame of ESA's General Support Technology Programme.

Intended as a one-year mission, Proba-1 has provided data successfully ever since its launch on 22 Oct 2001. Hosting two Earth Observation instruments CHRIS and HRC, Proba-1 has been managed, since 2004, by ESA's Ground Segment Department within the Directorate of Earth Observation at ESA/ESRIN.

Facts and figures
Operators ESA (European Space Agency)
Date of Launch 22 October 2001
Status Operating nominally
Orbit Height 615 km
Orbit Type Sun-synchronous elliptical polar
Repeat Cycle approx. 7 days
Resolution 18 m (CHRIS)
Swath Width 14 km (CHRIS)
Onboard Sensors provided under TPM
  • CHRIS (Compact High Resolution Imaging Spectrometer)
  • HRC (High Resolution Camera)