Could this be a nova?

https://www.legacysurvey.org//viewer/?ra=137.5493&dec=28.0315&layer=ls-dr9&zoom=13&ngc&sga-parent&sga&const

The green blob is an asteroid,
208911 (2002 TR279) JPL Small-Body Database

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Oh! And I just skipped a whole bunch of those, thinking they were hot pixels :joy: thanks!