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Atlas 5/OSIRIS-REx launch timeline

Follow the Atlas 5 rocket’s ascent from Cape Canaveral’s Complex 41 launch pad to send NASA’s OSIRIS-REx on an interplanetary trajectory to intercept Asteroid Bennu and bring back a pristine sample. Launch is scheduled for Thursday at 7:05 p.m. EDT (2305 GMT).

(Editor’s note: Times will vary slightly depending on when liftoff occurs during the two-hour daily launch window.)

T+00:01.1: LiftoffAV-008
The United Launch Alliance Atlas 5 vehicle, designated AV-067, will lift off and begin a vertical rise away from Complex 41 at Cape Canaveral Air Force Station, Florida.

T+00:57: Mach 1 and Max Q
a5_411_astra1kr
The Atlas rocket achieves Mach 1 some 57 seconds into the flight, then passes through the region of maximum dynamic pressure at 69 seconds.

T+02:19 Jettison SRB
EyeTVSnapshot[1829]
Having burned out of propellant approximately 50 seconds earlier, the spent solid rocket booster is jettisoned once dynamic pressure conditions are satisfied.

T+04:03: 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+04:09: 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+04:19: Centaur Ignition No. 1
EyeTVSnapshot[1848]
The Centaur RL10 engine ignites for the longer of the two upper stage firings. This burn will inject the Centaur stage and OSIRIS-REx into an Earth parking orbit.

T+04:27: Nose Cone Jettison
EyeTVSnapshot[1849]
The two-piece, 14-foot-diameter payload fairing that protected the OSIRIS-REx spacecraft during the atmospheric ascent is separated to reveal the satellite to space.

T+12:23: Centaur Engine Cutoff No. 1
EyeTVSnapshot[1850]
The Centaur engine shuts down after arriving in its planned temporary orbit around the Earth. The vehicle enters a brief coast period before reaching at the required location in space for the second burn.

T+33:48: Centaur Ignition No. 2
EyeTVSnapshot[1851]
The Centaur re-ignites to propel OSIRIS-REx on the outbound leg of its journey to Asteroid Bennu.

T+40:39: Centaur Engine Cutoff No. 2
EyeTVSnapshot[1854]
At the conclusion of its second firing, the Centaur will have delivered the necessary velocity for OSIRIS-REx to achieve an Earth-escape trajectory.

T+55:39: Spacecraft Separation
EyeTVSnapshot[1853]
NASA’s OSIRIS-REx asteroid sample return mission is released from the Centaur upper stage to begin its solo flight to Bennu, completing the AV-067 launch.

See earlier OSIRIS-REx 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/OSIRIS-REx launch timeline

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