Live coverage: Atlas 5 countdown and launch journal

The United Launch Alliance Delta 4 rocket, standing 217 feet tall and weighing 900,000 pounds, unleashes 1.8 million pounds of thrust from its main engine and four side-mounted boosters at 6:53 p.m. EST (2353 GMT) Wednesday to launch the eighth Wideband Global SATCOM satellite for U.S. military communications.

Follow the unclassified portion of the Atlas 5 rocket’s ascent to space from California’s Vandenberg Air Force Base launch site with the U.S. National Reconnaissance Office’s NROL-79 satellite payload. Launch is scheduled for Wednesday at 9:50 a.m. local time (12:50 p.m. EST; 1750 GMT).

SpaceX launched the next group of satellites for the company’s Starlink broadband network Wednesday at 9:25 p.m. EDT (0125 GMT Thursday) from pad 40 at Cape Canaveral Air Force Station. The satellites rode into orbit on a Falcon 9 rocket with a first stage flown on four previous missions, and the booster made a successful fifth landing on a SpaceX drone ship in the Atlantic Ocean.