The near arm of the ring appears to be abruptly truncated close to the planet, at the point where it passes into Jupiter's shadow. Some radial structure is barely visible across the ring's ansa . Because of shadowing, the halo is not visible close to Jupiter in the lower right part of the mosaic. Jupiter's main ring is a thin strand of material encircling the planet. The diffuse innermost boundary begins at approximately 123,000 km.
Satellites seem to affect the structure of even tenuous rings like that found at Jupiter.