The In-orbit Performance of SEVIRI From Observations of Mercury and Venus

We investigated various aspects of the in-orbit performance a Spinning Enhanced Visible Infra-Red Imager (SEVIRI) on Meteosat-10 (launch: 05 Jul 2012) and -11 15 2015) with images, where Mercury or Venus stood close to earth. These objects are similar smaller size than instantaneous field view, therefore they well suited for checks geometric requirements. From comparing position in different channels, we conclude that north–south distance between two focal planes is shorter nominal value by $0.66\pm 0.14$ km at subsatellite point (SSP) longer notation="LaTeX">$1.44\pm 0.16$ SSP Meteosat-11. The tilt detector array against equator less 0.0037 notation="LaTeX">$^\circ$ SEVIRI Metosat-10. sampling narrow channels east–west direction 3.0015 km, one-sigma uncertainty 20 cm SSP. tests carried out check instrument confirmed compliant spread function as determined from image planet agrees expectations based its combination finite impulse response. Finally, stability calibration coefficients thermal infrared time scale 1 h down 1% level. Hence, planets promising alternative established methods in-flight characterization validation imagers.