Bittty, Are you certain about the nebula being closer to Atys than the light source? It seems mostly fixed relative to the background stars.
If your measurements are correct though maybe we need to discuss how Atys' system is supposed to work, even if animation is not ideal? The nebula could be gasses around a white dwarf, and Atys, the ringed planet and orange moon have been pushed back so far we cannot see the star compared to the gasses? A white dwarf also puts out mostly UV light, so the ringed planet and orange moon could be Fluorescent, which is why the seem to emit more visible light than is emitted from any object in our system?
If your measurements are correct though maybe we need to discuss how Atys' system is supposed to work, even if animation is not ideal? The nebula could be gasses around a white dwarf, and Atys, the ringed planet and orange moon have been pushed back so far we cannot see the star compared to the gasses? A white dwarf also puts out mostly UV light, so the ringed planet and orange moon could be Fluorescent, which is why the seem to emit more visible light than is emitted from any object in our system?