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Hi Roman
Re your Io question, I could not find a lot of info on the spectral reflectance of Jupiter and Io, but what I did find suggests that Io looks brighter than Jupiter in the IR because it has significantly higher reflectivity than the planet in that region. It seems that the surface of Io is largely covered by a bright SO2 frost, which remains highly reflective in the near IR, but the top layers of the planet have spectra with significant absorption bands and therefore lower reflectivity. Would not claim that this is a definitive answer, but it could explain the observations.
Regards Ray
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