Colour image of RO-1001 and RO-1001-Sat from F444W, F277W and F115W bands of JWST NIRCam. The cyan box shows the 1.1′×1.2′ FOV of the MUSE mosaic. The orange circles show the virial radii of the two halos with the errors illustrated by the pink segment on each circle, being 197 ± 45 and 269 ± 41 kpc for RO-1001-Sat and RO-1001. The contours show the Lyα SB distributions in both nebulae displayed in steps of log$({\mathrm{SB}}_{\mathrm{Ly}\alpha }/{\mathrm{erg}\mathrm{s}}^{-1}{\mathrm{cm}}^{-2}{\mathrm{arcsec}}^{-2})$ = (−18.5, −18.0, −17.5, −17.0). The lowest contour level corresponds to S/N = 5. Candidate member galaxies of the satellite halo in Table 2a are marked by green circles. The central brightest galaxy (log(M_*/M_⊙)≃11.3) is highlighted by the pink circle. The radii of the green circles are proportional to the stellar masses of the galaxies, ranging from log(M_*/M_⊙)≃9.5 − 10.3.