UFO:UFO Orb-like Scout Ship Flyby Nevada-Arizona

What changes its not its size but its apparent magnitude, and this is a pretty common occurrence when watching objects in the sky which are artificial in nature. Some natural objects like variable stars also change their apparent magnitude, but this is not the case, assuming that the video is authentic; that behaviour could be easily explained by the fact that a satellite, a rocket sent nearly that date, being positioned in orbit, or the current space station (ISS) cutting the Sun's light cone or the reflection of its light at Earth's or Moon surface would be exposed to increasing or decreasing amounts of light. Many artificial satellites seen on clear skies change their apparent magnitude. Plus, its apparent acceleration could be explained, aside from optical effects, with a little understanding of orbital trajectories: an object following an eccentric orbit would show a variable speed, according to Kepler's laws. I don't mean that this would be exactly that case, but has the spotter discarded these possibilities first? I tell you this as a pilot: you have to report unaccounted traffic when you see it, so you have to know what you are looking at.