Stationary then movement at high speed while flashing white red

I was looking at what I thought was the big dipper, noticing the stars flicker as one near the end of the "handle" was brightening and started to flicker red and white like an airplane's nav light so I continued to focus on that stationary I'll say "light". after about 4 seconds the light with no delay or buildup of speed rapidly moved from due southeast to due west at easily about 3-4 times the speed of airplanes in view or about half the speed of a meteor burning up maybe twice the speed of a satellite. Then stopped flashing red to pulsing white only, fading over a span of 90° or so from my location. I have viewed many satellites/space junk, meteors, aircraft and some spacecraft and this was not an identifiable object. Basically it blended in with the other stars in color, stability, glint and Size until it decided to brighten change color a few times instantly get to its desired speed to a fading white pulse while exiting stage right, taking only a few seconds. It appeared to be outside the atmosphere but I really couldn't say for sure. Thanks, good luck.