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Atlas 5/GPS 2F-12 launch timeline

Follow the Atlas 5 rocket’s ascent into orbit from Cape Canaveral’s Complex 41 launch pad with the U.S. Air Force’s GPS 2F-12 navigation satellite. Launch is scheduled for Friday at 8:38 a.m. EST (1338 GMT).

T+0:00:01.1: Liftoff
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The United Launch Alliance Atlas 5 vehicle, designated AV-057, will lift off and begin a vertical rise away from Complex 41 at Cape Canaveral Air Force Station, Florida.

T+0:01:18.5: Mach 1 and Max Q
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The Atlas rocket achieves Mach 1 some 78 seconds into the flight, then passes through the region of maximum dynamic pressure at 90 seconds.

T+0:04:04: Main Engine Cutoff
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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+0:04:10: Stage Separation
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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+0:04:20: Centaur Ignition No. 1
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The Centaur RL10 engine ignites for the longer of the two upper stage firings. This burn will inject the Centaur stage and GPS 2F-12 spacecraft into a transfer orbit.

T+0:04:28: Nose Cone Jettison
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The two-piece, 14-foot-diameter payload fairing that protected the GPS 2F-12 craft during the atmospheric ascent is separated to reveal the satellite to space.

T+0:17:04: Centaur Engine Cutoff No. 1
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The Centaur engine shuts down after arriving in a planned elliptical transfer orbit of 11,000 by 90 nautical miles. The vehicle enters a three-hour coast period before arriving at the required location in space for the second burn.

T+3:17:03: Centaur Ignition No. 2
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The Centaur re-ignites to circularize the orbit and enter the Global Positioning System satellite constellation in delivery of GPS 2F-12.

T+3:18:30: Centaur Engine Cutoff No. 2
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At the conclusion of its second firing, the Centaur will have delivered the GPS spacecraft into the targeted circular orbit of 11,047 nautical miles, inclined 55 degrees to the equator.

T+3:23:16: Spacecraft Separation
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The Global Positioning System 2F-12 navigation satellite is released into orbit from the Centaur upper stage to complete the AV-057 launch.

See earlier GPS 2F-12 coverage.

Our Atlas archive.

Source: Space Flight

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Atlas 5/GPS 2F-12 launch timeline

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