Calibration of MAJIS (Moons and Jupiter Imaging Spectrometer): VI. The inflight calibration unit (ICU) (invited).

The article explores the calibration process of the MAJIS inflight calibration unit (ICU) for the ESA's JUICE mission, which includes sources for the VISNIR and IR channels illuminating a diffusing screen with transmission filters. It provides a detailed overview of the design, technical specifications, and testing of the ICU components, such as the VISNIR lamp, IR emitter, and diffuser, to ensure accurate calibration. The document also discusses the technical description and performance evaluation of the ICU, including analyses of spectral radiance, variations in spectral features under different conditions, and the characterization of filters like didymium and polystyrene. The study, funded by the Italian Space Agency and CNES with support from Leonardo Company, concludes that the filters meet acceptable limits for monitoring spectral registration across the instrument's temperature range, with data accessible only to team members. [Extracted from the article]