Hello Everyone!

I was processing some data of the Leo Triplet that i got from one of the Chilescope's Newtonians. I spotted a rather large pale spot in my images, that i could not identify. It does not come from dust on the sensor or on the filters as I used flat frames and the spot moved continuously over the course of the night. Also, it was clearly visible in the frames from both nights (15.05.20 & 16.05.20) and showed the same movement in both of those nights. The link below shows a GIF of two of the frames (inverted) of the first night, approximately 2h apart. The GIF is annotated to show the exact coordinates.  I checked a few planetarium programs, but couldn't identify it yet. At first i thought it was some kind of sensor artifact, but the continuous movement over the course of two nights seems to indicate otherwise.... If anyone has any idea what this could be or how i could find out, I would be very happy!
Link: https://astrob.in/9q2yq1/0/

CS,
Benjamin
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