My wife and I were at Polihale State Park located on the north-west side ofKauai. We viewed the sunset and were talking while observing the nightsky. The quarter moon and Venus, over the ocean was to my back, and a dipper star constellation was over my left shoulder, as I stood facing inland.At approximately 1930 hrs., while looking above the mountain range at thenight sky I noticed what I thought to be a star at first, growing in size and light intensity. It expanded while keeping a perfectly circular shape, andit brightened in proportion to it's growing size. I'd estimate that at it's largest, it was just larger than a dime held at arms length. There seemed to be a smaller grey-ish circle at it's center. It remained enlarged for 5 seconds or so, and then began to decrease in size. Startled, I tried to help my wife off the tailgate of the truck so she could see it. In doing so I looked away for a moment, and when I looked again, it now looked like justanother star in the sky. It remained stationary for 5 seconds or so, then began to move in a south-easterly direction. I have observed satellites tracking through the evening sky, and it look like this except it moved abit faster than I've seen satellites travel. It tracked steady and straight till I could no longer see it.The only other experience of the evening, which I thought strange, was how disoriented I felt driving home, which is roughly a 20 minute drive, and for about an hour or so after returning. After some time to think about what we saw, I could only relate this to possibly being a stationary satellite that performed a 'burn' to be relocated although from my view and angle, the light never resembled that of what I would think a burning rocket motor to look like. Furthermore, after sharing this with a friend today, she went online and showed me a satellite/ISS tracking page that shows what, if any, was visible at my location and time. Nothing was overhead within 2 hours before, or after.