This is the launch timeline to be followed by the Atlas 5 rocket’s ascent into orbit from Cape Canaveral with the EchoStar 19 satellite for HughesNet’s direct-to-home Internet connectivity. Launch is scheduled for Sunday at 1:27 p.m. EST (1827 GMT).
With the RD-180 main engine running, the three strap-on solid rocket boosters are lit as the Atlas 5 vehicle lifts off and begins a vertical rise away from Complex 41 at Cape Canaveral Air Force Station, Florida.
T+02:05.1 Jettison SRBs
Having burned out of propellant approximately 30 seconds earlier, the spent solid rocket boosters are jettisoned to fall into the Atlantic Ocean. The separation event is staggered with two motors releasing first, then the other a moment later.
T+04:32.7 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+04:42.7 Centaur Ignition 1
The Centaur RL10C-1 engine ignites for the first of two upper stage firings. This burn will inject the Centaur stage and EchoStar 19 spacecraft into an initial parking orbit.
T+13:38.6 Centaur Cutoff 1
The Centaur engine shuts down after arriving in a planned low-Earth parking orbit. The vehicle enters a 10-minute coast period before arriving at the required location in space for the second burn.
T+28:57.6 Centaur Cutoff 2
The powered phase of flight is concluded as the Centaur reaches the planned super-synchronous transfer orbit of 127 by 40,389 statute miles at an inclination of 25.44 degrees.
See earlier EchoStar 19 coverage.
Our Atlas archive.