Artifact?
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by heliiaruy
Photographic noise? There is a very small blip of opposite colour at "3 oclock"
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by ElisabethB
It could be a case of over saturation ?
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by DZM admin
Probably best to just mark the other image as "more complex," as there's no real way to mark a bad image in the classification interface?
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by ElisabethB
You can always come to Talk and tag it as a #bad_image or #artifact 😄
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by Mjtbarrett
Possibly just a cluster of bad pixels (an instrument effect). See:
http://www.cfht.hawaii.edu/Instruments/Imaging/Megacam/rawdata.html#P3Posted