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The Mission




Rocket: Falcon 9
Payload: Dragon C2+
Launch Date: May 22, 2012
Launch Time: 0744 GMT (3:44 a.m. EDT)
ISS Grapple: May 25, 2012 @ 1356 GMT (9:56 a.m. EDT)
ISS Departure: May 31, 2012 @ 0935 GMT (5:35 a.m. EDT)
Splashdown: May 31, 2012 @ 1542 GMT (11:42 a.m. EDT)
Launch Site: SLC-40, Cape Canaveral, Florida
Landing Site: Pacific Ocean

Mission Status Center

Rendezvous photos

Countdown timeline

Launch timeline

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Rendezvous timeline

Engine static fire

Wet dress rehearsal

Falcon on the pad

Dragon's new systems

Dragon processing

Dragon background info

Falcon archive






Falcon 9 countdown timeline
SPACEFLIGHT NOW
Posted: May 15, 2012


NOTE: All times approximate

T-minus 7 hours, 30 minutes Power Vehicle
Launch controllers power up the Falcon 9 rocket for countdown operations.
T-minus 3 hours, 50 minutes Begin LOX Loading
Liquid oxygen begins flowing into the Falcon 9 rocket's first and second stages.
T-minus 3 hours, 40 minutes Begin RP-1 Loading
Highly-refined kerosene - a product called RP-1 - begins flowing into the Falcon 9 rocket's first and second stages.
T-minus 3 hours, 15 minutes Fueling Complete
The Falcon 9's propellant tanks are full. Cryogenic liquid oxygen will continue to be replenished until the final minutes of the countdown.
T-minus 13 minutes Final Readiness Poll
The launch team is polled for their "go" or "no go" for entering the terminal countdown.
T-minus 10 minutes Begin Terminal Countdown
The terminal countdown sequence begins.
T-minus 8 minutes Dragon Internal Power
The Dragon spacecraft is transitioned to internal power.
T-minus 6 minutes Align Flight Computer
The Falcon 9's flight computer is aligned for flight.
T-minus 5 minutes Falcon Internal Power
The Falcon 9 rocket is transitioned to internal power.
T-minus 3 minutes Terminate LOX Loading
The liquid oxygen replenishment to the rocket's first and second stages ends and the system is readied for liftoff.
T-minus 2 minutes, 30 seconds SpaceX Reports GO
The SpaceX launch director confirms the Falcon 9 is "go" for launch.
T-minus 2 minutes Air Force Range Reports GO
The U.S. Air Force range safety officer verifies "go" for launch.
T-minus 1 minute Flight Computer in Start-Up Mode
The Falcon 9 flight computer is commanded to start-up mode, and the launch pad's Niagara and deck water systems are activated.
T-minus 50 seconds First Stage Steering Check
The thrust vector control, or gimbal, system on the first stage's Merlin engines is checked for launch.
T-minus 40 seconds Pressurize Propellant Tanks
The Falcon 9's first and second stage propellant tanks are pressurized for flight.
T-minus 3 seconds Start Engine Ignition Sequence
The engine controller commands the Falcon 9's nine Merlin 1C first stage engines to ignite, followed by a computer health check to verify the engines are healthy before liftoff.

Data source: SpaceX

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