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Atlas 5/NROL-61 launch timeline

Follow the unclassified portion of the Atlas 5 rocket’s ascent to space from Cape Canaveral’s Complex 41 launch pad with the U.S. National Reconnaissance Office’s NROL-61 satellite. Launch is scheduled for Thursday at 8:37 a.m. EDT (1237 GMT).

T+00:01.1: Liftoff
Launch of Atlas AV-014 ICO G1
The United Launch Alliance Atlas 5 vehicle, designated AV-065, will lift off and begin a vertical rise away from Complex 41 at Cape Canaveral Air Force Station, Florida.

T+00:47: Mach 1 and Max Q
2
The Atlas rocket achieves Mach 1 some 47 seconds into the flight, then passes through the region of maximum dynamic pressure at 52 seconds.

T+02:09 Jettison SRBs
srbs
Having burned out of propellant approximately 40 seconds earlier, the spent solid rocket boosters are jettisoned once dynamic pressure conditions are satisfied.

T+04:10: Main Engine Cutoff
3
The RD-180 main engine completes its firing after consuming the load of RP-1 kerosene fuel and liquid oxygen supply in the Atlas first stage.

T+04:16: Stage Separation
4
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+04:26: Centaur Ignition No. 1
5
The Centaur RL10 engine ignites to inject the Centaur stage and NROL-61 spacecraft into orbit.

T+04:34: Nose Cone Jettison
6
The two-piece, 14-foot-diameter payload fairing that protected the NROL-61 craft during the atmospheric ascent is separated to reveal the satellite to space.

The mission now enters a news blackout to perform the orbit-shaping and payload deployment for the National Reconnaissance Office in secrecy.

See earlier NROL-61 coverage.

Our Atlas archive.

Source: You’ll find lots of information about the planets Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus and Neptune. Also we have facts about the space station, ISS, SpaceX launch, space program, and outerspace. Space Flight

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Atlas 5/NROL-61 launch timeline

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