The satellite Thebe, discovered by space probes, is also observable from the ground. The images at left are among the first made from the ground. They were made at the Pic du Midi with the 1 meter telescope.
To detect Thebe, image processing is required. Thebe is the smallest body which moves from right to left from an image to another. The body above is a star. The Galilean satellites Io and Ganymede, below left and right are very bright in comparison.