reply to post by daz__
Not an expert in photography by any means...but..
It really looks like a lens flare to me though. The faint outer ring surrounding the "object" leads me to that conclusion.
What is significant as blow ups Figures 2 and 3 show, is that the digital pixelation around the spot is the same as around the moon, suggesting that the spot is something in the view of the camera rather than distortion within the camera.