Black circles iterating in a triangle
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by domanite
I've noticed several times there will be a black circle (in this picture, its a little lower-left of center), and in each frame of the four, the circle is in a different, but close location, and oddly it seems to jump around in the same pattern each time I see this. If you overlap the frames, the circles are about in the corners of a triangle (and the fourth on the base of the triangle). Anyone else see these?
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by doggonemess
I have seen them in many images. I believe that it's some kind of camera artifact.
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by Dr.Asteroid scientist, admin
They usually are a bit of dirt somewhere in the system that casts a shadow. They exist and move around over the different nights.
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by scibuff
These are in either specks of dust in the optics or ccd artifacts. They move between the frames due to dithering - which is done on purpose - so that their motion cannot be linear or otherwise resemble that of real objects
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by skaftanski
So... mark as "artifact", right? (I saw same thing in http://talk.asteroidzoo.org/#/subjects/AAZ0001aai lower left )
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by stonepenny
mark as artefact and move on 😃
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by stonepenny
check spotters guide 'other' 😃
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