Stationary... The only things in the night sky that appears stationary is Polaris. If you mean stationary relative to known stars, if it is twinkling, it is a star. If doesn't twinkle, it's a planet. If it's noisy and blinking, you are a landing strip and about to become road kill.

This guy moved as a satellite. I'm tempted to say it was an Iridium flare due to the brightness (the peak was on par with the ISS or Jupiter, maybe a little more), but this wasn't a single *FLASH*, it was *blink-blink-blink* during it's entire transit of my sky. Increase in intensity seemed to mirror the decrease.

I keep going back to the 15 second cycle- I couldn't see any red or green blinks, I listened for anything that could have been engine noise and it moved pretty darn fast, so I don't THINK it was an aircraft. I've got to think it is a satellite that is spining, but I can't find any with a rotation that is a harmonic of 15 seconds.