Live coverage of the countdown and launch of a Proton rocket with the Turksat 4B communications satellite. Text updates will appear automatically below; there is no need to reload the page. Follow us on Twitter.
Related Articles
Falcon 9 rocket ready for all-important return to service Saturday
SpaceX rolled a fully-assembled Falcon 9 booster out of its hangar and lifted it on top of a launch pad Friday for the first time since an explosion grounded the commercial rocket last year, setting the stage for a one-second launch window Saturday to take off from California’s Central Coast and deploy the first 10 satellites in orbit for a $3 billion upgrade to Iridium’s globe-spanning message relay network.