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Purkinje Effect
Red stars are notoriously hard to estimate because of something called the Purkinje effect, which makes red objects seem brighter the longer you stare at them.
This is a quote from Geoff Gaherty from StarryNights forum, the discussion was on estimating magnitudes of red stars.
I noticed this effect dramatically the other week. Thought I'd hit the Nova jackpot for a moment there.
Interesting optical illusion.
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