Live coverage: Proton rocket lifts off with X-ray astronomy observatory

Live coverage of the countdown and launch of a Proton rocket with the Spektr-RG X-ray astronomy mission. Text updates will appear automatically below; there is no need to reload the page. Follow us on Twitter.

The live video webcast from Roscosmos will begin at approximately 1130 GMT (7:30 a.m. EDT) on launch day, and will be available on this page.