Slightly visible artifact

https://www.legacysurvey.org//viewer/?ra=183.0768&dec=32.4837&layer=ls-dr9&zoom=11

Is this some kind of mirror?

Yes, this is called a ‘ghost’, and comes from the bright star up and to the left (zoom out a bit), after reflecting off of different surfaces in the camera (eg, maybe a bit of reflection off the filter or lenses in the corrector)
Legacy Survey Sky Browser

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