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The Characterising Exoplanet Satellite (CHEOPS) is a space mission designedto perform photometric observations of bright stars to obtain precise radiimeasurements of transiting planets. The high-precision photometry of CHEOPSrelies on careful on-ground calibration of its payload. For that purpose,intensive pre-launch campaigns of measurements were carried out to calibratethe instrument and characterise its photometric performances. We report on mainresults of these campaigns, provide a complete analysis of data sets andestimate in-flight photometric performance by mean of end-to-end simulation.The on-ground photometric stability of the instrument is found to be of theorder of 15 parts per million over 5 hours. Our end-to-end simulation showsthat measurements of planet-to-star radii ratio with CHEOPS can be determinedwith a precision of 2% for a Neptune-size planet transiting a K-dwarf star and5% for an Earth-size planet orbiting a Sun-like star. It corresponds tosignal-to-noise ratios on the transit depths of 25 and 10 respectively,allowing the characterisation and detection of these planets. The pre-launchCHEOPS performances are shown to be compliant with the mission requirements.

Expected performances of the Characterising Exoplanet Satellite (CHEOPS). I. Photometric performances from ground-based calibration