Purple black spot
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by Charleytanx
What is the purple/black dot please?
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by JeanTate
It's a kind of artifact; the software which processes the data stream from the camera blocks very bright sources by putting this kind of black square over the center. More details in the Spotters' Guide.
Happy hunting!
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by Charleytanx
I have since read the spotters' guide fully and now feel silly for asking such a question. It's lucky all my fellow astronomers are so nice.
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