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A satellite.
There are so many of them up there that just about every observing session I have one cross the (small) FOV. Out of curiosity I looked up what they might have been. Most of the time I found out it was a piece of the Chinese satellite that was destroyed by a Chinese ASAT test. It left an incredible amount of debris in fairly stable (=long lived) orbits.
Irritating and I am sure annoying for astrophotographers.
If you are interested in finding out download a package like Orbitron, input your location and download the latest two-line-element sets. Then try and match the approximate alt-az & time to see what you might have seen.
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