I was shooting the Moon and Jupiter, but the light from the lunar surface bounce back to the sensor onto the UV filter of the lens. I guess I will take the filter off next time I shoot celestials. It gives the image a surreal look with the moon turning green. Ganymede and Europa are the Galilean moons visible at the time I took the image.

Nikon D800E and Sigma 70-200 2.8

100 percent crop