T-07:45:00	Start of Countdown
The final countdown begins with functional checks of the rocket.
T-06:45:00	Verification of Communications Links
Launch controllers verify communications, tracking and telecommand links between the Vega rocket and ground facilities at the Guiana Space Center.
T-05:40:00	Launcher Powered On
Systems on the Vega launcher are powered on for health checks.
T-04:20:00	Inertial Platform Alignment
The 98-foot-tall rocket's inertial navigation platform is aligned for flight.
T-02:40:00	Gantry Rollback
The mobile service gantry, which stands 16 stories tall, is retracted about 260 feet away from the Vega rocket at the ZLV launch complex at the Guiana Space Center.
T-00:44:00	Ready for Final Countdown
Engineers conduct another check of Vega's systems before the beginning of the computer-controlled synchronized sequence.
T-00:03:30	Start of Synchronized Sequence
Computers assume command of the countdown in the final minutes, making thousands of checks to ensure all systems are ready for liftoff.
T-00:00:00	Ignition
Ignition of the Vega's solid-fueled P80 first stage motor, followed by liftoff 0.3 seconds later.

Data source: ESA