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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

Flight day one timeline

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
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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