Not all satellites blink, some remain quite constant in brightness except for the beginning and end of light transit. Obviously the object didn't remain over the disk of the moon for very long, otherwise you would have taken more images of it. Honestly mate, I think it is a satellite or spent space jumk, if you can make a definite second or third observation then report it, but you will have to be dead sure it was the same object, and I doubt that will happen.
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