Lens?

https://www.legacysurvey.org//viewer/?ra=338.0186&dec=3.2310&layer=hsc-dr2&zoom=16&const

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Yeah, that definitely looks like a lens, probably known. It’s around clusters that you get these large, dramatic lens arcs.

How can you know whether it is known or not?

The first thing is to check SIMBAD but it gave no hits.
It’s not listed in GLQ Database or CASTLES either.

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