It could be internal to the camera or on the lens or part of the clouds mentioned in the text or a tower with a light or something reflective.

What it isn't...is Planet X or every Aussie Amateur Astronomer would be on the net telling everyone they found a massive object...

You know now that I think of it...depending on the focal length of the camera that dot appears to be at least Moon sized and thus noticeable to anybody with eyes to see!

Look Sam there maybe "wandering planets" read June's Astronomy...but that doesn't make Planet X exist or heading towards Earth.

You would first need a method of creating it. Current theroies on how the Solar System formed don't seem to allow for its existance. So you you might claim it was captured into the system... How? It's would be on a very long parabolic orbit...it doesn't make sense...

--Chris Vancilnow