Centaur Upper Stage Rocket Fuel Dump

On August 31st the last Atlas 2 rocket was launched from Launchpad 36A in Florida (the launchpad is also being retired) and one orbit later its Centaur upper stage overflew Toronto and vented excess reactants into space shortly after nightfall. It was a beautiful sight. After admiring the view I compiled this sequence of 8 images with the StellaCam, spaced over 8 minutes and ending at 9:08 PM EDT.