Probably some light diffraction - did you have a UV filter on?
Pic is outafocus a bit, and doesnt look like it was tracking or over a period of time to capture any colour??
Interesting though, I must admit.
Internal lens reflection. We've all seen this before, its a common artifact with the modern camera lenses. That it appears at roughly the same distance in two different photos should be a dead giveaway its a lens artifact. I should go dig up some old threads where other people have got the same result.
