September 11, 3:04 P.M., Cassini gives Titan a 'goodbye kiss', approaching it for a final, distant flyby and using the moon's pull to force itself into the final descent.
September 12, 9:19 P.M., Earth starts receiving Cassini's last data on Titan.
September 14, 3:58 P.M., Cassini's cameras take their last pictures. The clouds of Saturn will serve as the subject of this bittersweet photoshoot.
September 14, 4:22 P.M., Cassini's last batch of data—including those last pictures—begin streaming back to Earth. NASA plans to post raw images online as they are received. Earth will start receiving those signals at 5:45 P.M.
September 15, 3:14 A.M., The spacecraft rolls into position to collect atmospheric data during the descent, and re-configures its systems to transmit data in real-time. Because of the sheer distance between Earth and Saturn, these signals will be received on Earth at about 4:37 A.M.
September 15, 6:31 A.M., Cassini enters Saturn's atmosphere.
September 15, 6:32 A.M., Cassini's antenna points away from Earth, leading to a loss of signal. Shortly afterwards, the spacecraft is vaporized in the high pressure and temperature of Saturn's atmosphere.
September 15, 7:00 A.M.-8:30 A.M., NASA livestreams the scene at mission control at NASA JPL, with live commentary about the end of the mission.
September 15, 7:55 A.M., Earth registers the loss of signal, indicating the end of Cassini.