Very diffuse, but very active

https://www.legacysurvey.org//viewer/?ra=355.9797&dec=0.0752&layer=hsc-dr3&zoom=14

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looks much darker than the background sky ~ huge absorbtion nebula, perhaps :thinking:

Probably a masking issue in HSC dr3, why I call it “trash”

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Appears in legacy too though. Definitely not an HSC issue. Absorption nebula would be my guess.

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yep, I see it also in DR9