The blue dot is more likely an artifact of the post-processing. On the NASA's version of the image [1] you can't see it. [1] https://www.missionjuno.swri.edu/j

The blue dot is more likely an artifact of the post-processing. On the NASA's version of the image [1] you can't see it. [1] https://www.missionjuno.swri.edu/junocam/processing?id=636 https://www.missionjuno.swri.edu/junocam/processing?id=636