Green tail

https://www.legacysurvey.org//viewer/?ra=139.0101&dec=17.6494&layer=ls-dr9&zoom=15

Extreme jellyfish?

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Don’t think so as debris isn’t usually green I don’t think. Might just be an artefact but not sure. Wouldn’t say jellyfish though.

There is a jellyfish up left

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I think this is an un-masked airplane trail in one of the r-band exposures:
https://www.legacysurvey.org/viewer/ccd/ls-dr9/decam-605043-S17.xhtml?rect=267,2289,100,100

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Ah thank you. Definitely looks like an airplane trail.