WHat did I see in the sky over Austin last night?

I was driving east on highway 290 about a mile or two east of Loop 1 and looking at the Moon rising ahead of me when I noticed a white point of light about 10 degrees above the horizon and maybe 10 or 20 degrees to the right (south) of the direction I was driving and moving left (north) at about 1 or 2 degrees a second. At first I assumed it was an airplane, but there was only one light, pure white, and not flashing, about like a zero magnitude star. My first thought was somebody was flying a drone with one light on it, but if so it was pretty high for a drone. I watched it for some tens of seconds as it moved across my field of vision toward my left (north). As it did it got brighter and higher above the horizon, as if it was small and low enough so that my motion to the east was taking me under it as it moved north and producing the brightening and higher angle above the horizon . By the time it was maybe 60 degrees to my left, 20 or 30 degrees up, and brightened to maybe -3 magnitude it split into 2 lights, one a bit dimmer than the other, say -3 and 0 magnitude with the dimmer one on the right side. They moved apart at about 1 degree per second as they both kept moving north, now almost directly to my left, or even a bit behind me, and in 5 seconds or less they both faded away. It almost looked like a firework that didn't explode but split into two dying embers, one dimer than the other, as it burnt out. It was visible a total of maybe 30 seconds.