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We provide measurements of the absolute reflectivity of Jupiter and Saturnalong their central meridians in filters covering a wide range of visible andnear-infrared wavelengths (from 0.38 to 1.7 $\mu$m) that are not oftenpresented in the literature. We also give measurements of the geometric albedoof both planets and discuss the limb-darkening behavior and temporalvariability of their reflectivity values for a period of four years(2012-2016). This work is based on observations with the PlanetCam-UPV/EHUinstrument at the 1.23 m and 2.2 m telescopes in Calar Alto Observatory(Spain). The instrument simultaneously observes in two channels: visible (VIS;0.38-1.0 $\mu$m) and short-wave infrared (SWIR; 1.0--1.7 $\mu$m). We obtainedhigh-resolution observations via the lucky-imaging method. We show that ourcalibration is consistent with previous independent determinations ofreflectivity values of these planets and, for future reference, provide newdata extended in the wavelength range and in the time. Our results have anuncertainty in absolute calibration of 10--20\%. We show that under thehypothesis of constant geometric albedo, we are able to detect absolutereflectivity changes related to planetary temporal evolution of about 5-10\%.

Temporal and spatial variations of the absolute reflectivity of Jupiter and Saturn from 0.38 to 1.7 $\mu$m with PlanetCam-UPV/EHU