Black Dots Moving
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by kalspaugh
In frames 3 and 4 of this sequence, I see two black dots moving in the lower left hand corner? I logged it as an asteroid, but I am not sure what it is. Is it an anomaly on the image or something else?
Posted
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by MvGulik
Those are telescope related artifacts.
They come in black and white variations, and they can even change color in a single set.Any telescope related artifact is directly identifiable by the distinct relative virtual motion it makes.
(The upside-down T)
From frame 1 to frame-2: Up
From frame 1 to frame-3: Right.
From frame 1 to frame-4: Left.See here for the movement reason.
See A guide to artifacts for more artifact related information.Posted