The other night around 21:30 EST, I noticed an irregularly pulsing light within the Cygnus constellation. It wasn’t a star flickering due to cloud passage or other atmospheric effects, which I confirmed via my binoculars a few minutes later. At its brightest during pulsing, it was more luminous than Sadr/Gamma Cygni and bright satellites. I know that it wasn't moving because I had my resting on a fence to steady my frame of reference as best as possible while I watched it. I only observed it for a few minutes.

My question to anyone who knows more about this topic is: Could I have somehow seen a geo-stationary satellite? I didn't think they would reflect enough light to be seen from the distances at which they usually orbit. The asterisk in pic related shows the approximate location of the pulsing light, and the map is rotated to match my point of view from the ground.