Ben, I do like the term UFO, there is no baggage which goes with that, not if you take it literally. I have also seen some weird stuff go on due to atmospheric lensing, once saw what looked like a city full of sky scrapes on the horizon far above the arctic circle, it was just a little village 70 miles away and beyond line of sight, but the atmosphere was ducting it in to us and magnifying the height of the small houses to look like a big city. I also saw a yellow-orange orb like you have described once, but it was flying a few hundred feet over my head, silently, then did some strange things before blinking out, gone, but this thing was huge, not street light sized and not a point light source, it looked like a solid sphere.