Follow the Atlas 5 rocket’s ascent into orbit from Cape Canaveral’s Complex 41 launch pad with the Orbital ATK Cygnus resupply ship for the International Space Station. Launch is scheduled for Thursday at 5:55 p.m. EST (2255 GMT).
T+04:22: Stage Separation
The Common Core Booster first stage of the Atlas 5 rocket separates from the Centaur upper stage. Over the next few seconds, the Centaur engine liquid hydrogen and liquid oxygen systems are readied for ignition.
T+18:17: Centaur Engine Cutoff
At the conclusion of this firing, the Centaur will have delivered the Cygnus spacecraft into the targeted circular orbit of 124 nautical miles, inclined 51.6 degrees to the equator.
See earlier Cygnus OA-4 coverage.
Our Atlas archive.