8188 20260928150951.0 10.1007/s11214-025-01263-6 DOI SCART-2026-0155 Denk, T. Io and the Minor Jovian Moons – Prospects for Juice 2026 The Jupiter and Icy Moons Explorer (JUICE) mission of the European Space Agency (ESA) will investigate the Jovian system with multiple instruments over several years, beginning in early 2031. This paper describes the historical context and state of knowledge, as well as JUICE’s scientific goals and measurement techniques of the satellites that will not be encountered in close flybys. These include the large volcanically active moon Io, the four small inner moons Metis, Adrastea, Amalthea, and Thebe, and the numerous small Irregu- lar (outer) moons. JUICE will provide multiple opportunities to observe Io from relatively remote distances of hundreds of thousands of kilometers. These observations will enable monitoring of Io’s surface for changes, and for the study of its neutral clouds and plasma torus. Io observations will be performed with the four optical remote sensing instruments and with the Particle Environment Package. For the small inner moons it is planned to obtain complete geographic longitude (scales up to 8 km/px), solar-phase and multi-color cover- age, oblique polar views, and UV to near-IR spectra. Astrometric measurements will also be performed. The Irregular moons will mostly appear unresolved to the JUICE instruments. Nonetheless, long-duration disk-integrated lightcurves will be acquired to derive rotation periods, object dimensions, pole-axis orientations, and colors for most objects for the first time. From these data, convex-shape models will be generated and phase curves determined. Furthermore, the precision of the orbital elements will be improved via accurate astrometry. UV and near-IR measurements will be attempted for the largest of these objects. PRODEX PlanetInterior/ PRODEX PlanetInterior/ PRODEX PlanetInterior NO Williams, D.A Tosi, F. Bell, J.F. Motola, S. de Pater, I. Lainey, V. Molyneux, P. Matz, K.D. Hartogh, P. Lopes, R.M., Solomonidou, A. Thomas, P.C. Huybrighs, H.L.F. Gurvits, L.I. Mura, A. Retherford, K.D. Rezac, L. Roatsch, T. Roth, L. Haslebacher, N. Tubiana, C. Lucchetti, A. Langevin, Y. Poulet, F., Lellouch, E. Tsuchiya, F. Vallat, C. Van Hoolst, T. Space Science Reviews 222 2026 27 1-93 tim.vanhoolst@ksb-orb.be 17218755 http://publi2-as.oma.be/record/8188/files/Denk_SSR_2026.pdf 4247 http://publi2-as.oma.be/record/8188/files/Denk_SSR_2026.jpg?subformat=icon-180 icon-180 4472 http://publi2-as.oma.be/record/8188/files/Denk_SSR_2026.gif?subformat=icon icon published in REFERD