cloud of gas only shows up in unWISE and shows on WISE 12-micron dust map
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I’m routing an artifact on this one if it’s not visible in any of the LS releases
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Yeah, sorry, that’s a persistence artifact from a bright star on a previous exposure – one frame up – this marked star, I believe – Legacy Survey Sky Browser
You can find the star responsible by looking toward the north or south ecliptic pole - northward/southward, in between the diffraction spikes, by a bit less than one WISE frame = 1024 pixels x 2.75"/pixel ~ 0.75 degrees.
Here’s a similar “object” coming from a nearby star
Here’s a description of those artifacts
Here’s the actual W3/W4 data the 12-micron dust map was derived from –
cheers,
dustin
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