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Hi Kristoff,
Would probably have been easier to analyse a higher resolution image. My guess would be that the one on the right is a result of an internal reflection of the sharper image on the left, and that it was probably a point source of light that left that pattern on the sensor as it was moving relative the the camera (that could also mean telescope shaking too). How long was the exposure and are other objects in the image sharp?
As for CMOS sensitivity to EM spectrum, I would not think it was possible to pick much of anything outside of the visible spectrum, in particular that IR filter cuts frequencies below red light. Not sure about X-Rays though, I believe that sensitivity of CMOS used in DSLRs approaches zero below 300nm?
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