Spent 3 hours tracking a ghost planet that turned out to be a lens flare

Was out at a dark site near Big Bend two nights ago trying to catch Neptune passing behind a distant galaxy. Stacked 2 hours of exposure on my ZWO ASI2600 and got this suspicious fuzzy blob near the target. Spent forever tweaking flats and darks trying to clean it up. Finally zoomed in at full resolution and realized it was a reflection off a streetlight 30 miles away. Anyone else waste a whole session chasing something that wasn't real?

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