Thanks Terry, Paul and Ken for helping to work out what this was. I don't have enough knowledge to make much more than a cursory investigation (have a look in Star Atlas Pro). Just shows how useful it is having quick access to many people with greater experience through this forum.
I always flick through any series of images I take and if anything moves it really stands out. Quite often it is a weak internal reflection of a very bright star. These are easy to pick as they are usually directly opposite the star through the centre of the image (optic). The scary thing is they look like comets.
Bert
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