Photos: Thursday’s Atlas 5 rollout to launch pad

SpaceX’s Falcon 9 rocket is set for liftoff from Cape Canaveral early Thursday, heading due east over the Atlantic Ocean to deliver the Inmarsat 5 F4 communications satellite into orbit 32 minutes later.

A rocket engine with a long pedigree marked a big milestone on Monday. It’s 60 years since the hydrogen-fueled RL10 engine debuted onboard a Centaur upper stage launched from Cape Canaveral on Nov. 27, 1963.

Intelsat and SES, operators of the two largest fleets of geostationary communications satellites, have ordered 10 spacecraft from Maxar, Northrop Grumman and Boeing for launches beginning in 2022 to replace C-band capacity being transitioned to 5G cellular network services.