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Astrometric studies and orbital modeling of planetary moons have contributedsignificantly to advancing our understanding of their orbital dynamics. Thesestudies require precise positions measured over extended periods. In thispaper, we present the results of the 2021 Brazilian Jovian mutual phenomenacampaign. The data correspond to eight events between Galilean satellites, inaddition to a rare eclipse of Thebe, an inner satellite, totaling nine events.A geometric model along with the DE440/JUP365 ephemerides was used to reproducethe events and simulate the light curves. A Monte Carlo method and chi-squaredstatistics were used to fit the simulated light curves to the observations. Thereflectance model adopted for our simulations was the complete version of theOren-Nayer model. The average uncertainty of the relative positions of theGalilean satellites was 5 mas (15 km) and for the inner Thebe satellite 32 mas(96 km). The seven mutual events (nine independent observations) here analyzedrepresent and addition of 17% events (10% light curves) with respect to thePHEMU21 international campaign. Furthermore, our result of Thebe eclipse isonly the second measurement published to date. Our results contribute to theephemeris database, being fundamental to improving satellite orbits and thusminimizing their uncertainties.

The 2021 mutual phenomena involving the Galilean satellites of Jupiter and the inner satellite Thebe