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Point source is the heart of the matter here. When you record an image of a star and it appears as a round disk, you are not recording the actual disk of the star. The resultant disk is caused by guiding errors and the movement of atmosphere. We cannot image the Apollo landing sites with the largest telescopes on the planet. What hope do we have of imaging a transit event with the same telescopes? Nil. So this is most likely an optical error or dust mote not dealt with by the calibration frames.
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