https://www.legacysurvey.org//viewer/?ra=12.0507&dec=-0.2167&layer=ls-dr9&zoom=16
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The green dot is asteroid “114513 (2003 BQ1)”
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Thank you, thought it was a voorwerp or a supernova.
Note to self:
Always check the minor planet query!
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It’s too bad the current JPL minor planet queries take so long! But in this case it’s easy to see just in the single-exposure images – pops out in 2 of the images, nothing there in all the others 
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so not a Voorwerp ~ thanks for that 
slightest hint of p-r type
No polar-ring for me, as it looks like tidal remnants from another interacting pair of galaxies. Although the galaxy is listed in SPRC, which in LS appears not because SDSS has less resolution than DECam.
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