Appears to be an arc, or possible optical effect 🤔

https://www.legacysurvey.org//viewer/?ra=321.2623&dec=-6.9791&layer=ls-dr9&zoom=15&const

That purpe thing’s a star, so probably just a background object.

I know it’s a star…thought perhaps there was object behind said star responsible for the lensing…thought it was worth a punt