Very faint outer shell of stars (presumably) that wraps itself half-way around this large spiral....easier to spot with contrast 1.1 and brightness 3.8

https://decaps.legacysurvey.org//viewer/?ra=345.7243&dec=1.1393&layer=hsc-dr2&zoom=15&const

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has it already been identified :thinking:

Likely a stellar stream from a past minor merger.

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or possible a satellite(s) straying too close

Yeah, like the roche limit? I see a paper about it