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Soyuz launch timeline
Posted: August 18, 2014

T-00:00:03 Engines at Full Thrust
The five main engines of the Soyuz rocket's core stage and four strap-on boosters are at full thrust.
T-00:00:00 Launch
Producing more than 900,000 pounds of thrust, the Soyuz 2-1b rocket soars into the sky from the Guiana Space Center.
T+00:01:58 Jettison Boosters
The Soyuz rocket's four strap-on boosters, each powered by an RD-107A engine, are jettisoned after consuming their propellant.
T+00:03:29 Jettison Fairing
The ST-type payload fairing is released from the Soyuz rocket when it reaches the edge of the upper atmosphere. The 13.5-foot-diameter fairing protects the payload during the launch countdown and the flight through the dense lower atmosphere.
T+00:04:48 Core Stage Separation
Having burned its propellant, the core stage of the Soyuz rocket, also known as the second stage, separates and the third stage's RD-0124 engine ignites to continue the flight.
T+00:09:23 Soyuz/Fregat Separation
The Soyuz rocket's third stage releases the Fregat upper stage just shy of orbital velocity.
T+00:10:24 First Fregat Ignition
The hydrazine-fueled Fregat upper stage ignites to place the Galileo satellites in an oval-shaped parking orbit.
T+00:23:32 First Fregat Shutdown
The Fregat upper stage shuts down to begin a coast phase. The Fregat and Galileo satellites should now be in an elliptical transfer orbit.
T+03:39:00 Second Fregat Ignition
The Fregat stage's main engine fires for a second time to boost the Galileo satellites into a circular orbit.
T+03:43:57 Second Fregat Shutdown
After a 4-minute, 57-second burn, the Fregat upper stage shuts down and prepares to release the two Galileo satellites.
T+03:47:57 Galileo Separation
The two Galileo satellites are deployed from a dispenser on the Fregat-MT upper stage in a circular orbit at an altitude of 23,522 kilometers (14,615 miles) and an inclination of 55.04 degrees. The Fregat upper stage will be passivated after separation of the Galileo satellites.

Data source: Arianespace