0427 GMT (11:27 p.m. EST on Sun.)
SpaceX confirms separation of the Eutelsat 115 West B spacecraft.
0420 GMT (11:20 p.m. EST on Sun.)
ABS 3A separation confirmed!
0417 GMT (11:17 p.m. EST on Sun.)
SpaceX confirms a good restart of the second stage.
0415 GMT (11:15 p.m. EST on Sun.)
The Falcon 9 rocket's upper stage should be firing now to boost the ABS 3A and Eutelsat 115 West B into supersynchronous transfer orbit.
0410 GMT (11:10 p.m. EST on Sun.)
SpaceX has ended its webcast before the completion of the mission, but the Falcon 9 upper stage is now coasting and should re-ignite for about a one-minute burn at T+plus 25 minutes.
0359 GMT (10:59 p.m. EST on Sun.)
T+plus 9 minutes. The Falcon 9's upper stage has shut down after completing the first of two burns required to boost the Eutelsat and ABS satellites into a supersynchronous transfer orbit.
0358 GMT (10:58 p.m. EST on Sun.)
T+plus 8 minutes. The vehicle remains in a nominal trajectory. The terminal guidance phase of the launch will start soon.
0357 GMT (10:57 p.m. EST on Sun.)
T+plus 7 minutes. The kerosene-fueled Merlin 1D upper stage engine generates about more than 150,000 pounds of thrust in vacuum.
0355 GMT (10:55 p.m. EST on Sun.)
T+plus 5 minutes. Everything reported to be going well with this second stage engine firing. The Merlin vacuum engine uses an ultra-thin niobium nozzle extension for greater efficiency in the upper atmosphere.
0354 GMT (10:54 p.m. EST on Sun.)
T+plus 4 minutes. The Falcon 9's payload fairing has been jettisoned.
0353 GMT (10:53 p.m. EST on Sun.)
T+plus 3 minutes. The Falcon 9 first stage engines have cut off, the stages have separated, and the rocket's second stage Merlin vacuum engine has ignited for its nearly seven-minute firing to reach orbital velocity.
0352 GMT (10:52 p.m. EST on Sun.)
T+plus 2 minutes. Now soaring at an altitude of more than 20 miles, the Falcon 9 rocket's first stage will shut down and jettison in about one minute.

And chilldown of the second stage's vacuum-rated Merlin 1D engine has started in preparation for its ignition.

0351 GMT (10:51 p.m. EST on Sun.)
T+plus 1 minute. The Falcon 9 rocket is approaching the speed of sound and the phase of maximum aerodynamic pressure.
0350 GMT (10:50 p.m. EST on Sun.)
T+plus 20 seconds. The Falcon 9 rocket's pitch program has initiated to put the 224-foot-tall rocket on an easterly trajectory from Cape Canaveral.
0350 GMT (10:50 p.m. EST on Sun.)
LIFTOFF of the Falcon 9 with satellites for Eutelsat and ABS, boosting a new generation of communications relay stations into orbit.
0349 GMT (10:49 p.m. EST on Sun.)
T-minus 60 seconds. In the final minute of the countdown, the flight computer will command checks of the first stage Merlin engine steering system and the Falcon 9 propellant tanks will be pressurized for flight. Thousands of gallons of water from the 53 water nozzles on ground facility's Niagara system will also be dumped onto the launch pad deck to suppress the sound and acoustics of liftoff.

The command to start the ignition sequence for the first stage will be issued at T-minus 3 seconds, triggering the Merlin engines' ignitor moments before the powerplants actually ramp up to full power.

0348 GMT (10:48 p.m. EST on Sun.)
T-minus 90 seconds and counting. The SpaceX launch director and the Air Force Eastern Range have given their final approvals for liftoff of the Falcon 9 rocket at 10:50 p.m. EST (0350 GMT).
0348 GMT (10:48 p.m. EST on Sun.)
T-minus 2 minutes and counting. The rocket's Merlin 1D engines have been chilled down for ignition.
0347 GMT (10:47 p.m. EST on Sun.)
T-minus 2 minutes, 30 seconds. The strongback has been locked in to launch position.
0347 GMT (10:47 p.m. EST on Sun.)
T-minus 3 minutes and counting. The rocket's destruct system is on internal power and being armed, and liquid oxygen topping is being terminated.

The strongback has retracted into the launch position about 20 degrees from the rocket.

The second stage thrust vector steering system has checked out and is ready for flight.

0345 GMT (10:45 p.m. EST on Sun.)
T-minus 5 minutes and counting. The cradles connecting the strongback to the Falcon 9 rocket have opened.
0344 GMT (10:44 p.m. EST on Sun.)
T-minus 6 minutes and counting. The Falcon 9 rocket is now operating on internal power.

The strongback umbilical tower will soon be lowered a few degrees to clear the rocket for launch. The procedure begins with opening of cradles gripping the rocket at attach points, then hydraulics lower the tower into launch position.

0343 GMT (10:43 p.m. EST on Sun.)
T-minus 6 minutes, 30 seconds. The Falcon 9's heaters are being deactivated, and the rocket will be transitioned to internal power in a few seconds.
0343 GMT (10:43 p.m. EST on Sun.)
T-minus 7 minutes and counting. Within the next minute, the Falcon 9's flight computer will be commanded to its alignment state. The Merlin engine pumps are continuing to chill down.
0342 GMT (10:42 p.m. EST on Sun.)
T-minus 8 minutes and counting. Good chilldown continues on the first stage engines, and closeouts of the upper stage's gaseous nitrogen attitude control system are underway.
0340 GMT (10:40 p.m. EST on Sun.)
T-minus 9 minutes, 30 seconds. Prevalves leading to the Falcon 9's Merlin 1D first stage engines are opening, permitting super-cold liquid oxygen to flow into the engines to condition the turbopumps for ignition.
0340 GMT (10:40 p.m. EST on Sun.)
T-minus 10 minutes and counting. The terminal countdown autosequence has started. Any hold after this point will result in an automatic abort and recycle to T-minus 13 minutes.
0338 GMT (10:38 p.m. EST on Sun.)
T-minus 12 minutes. The launch team has verified all consoles are go for liftoff at 10:50 p.m. EST (0350 GMT).

The terminal countdown autosequence is about to begin at the T-minus 10 minute mark.

0335 GMT (10:35 p.m. EST on Sun.)
T-minus 15 minutes and counting. Here are some statistics on today's launch:
0333 GMT (10:33 p.m. EST on Sun.)
T-minus 17 minutes and counting. The Falcon 9 rocket stands 224 feet tall and measures 12 feet in diameter. At liftoff, its nine Merlin 1D first stage engines will generate about 1.3 million pounds of thrust.

Fully fueled for launch, the Falcon 9 contains about 1.05 million pounds of kerosene and liquid oxygen propellants.

0330 GMT (10:30 p.m. EST on Sun.)
T-minus 20 minutes and counting. The final poll of SpaceX's 14-person launch team will begin at T-minus 13 minutes before the countdown enters the final phase.
0328 GMT (10:28 p.m. EST on Sun.)
The Eutelsat and ABS spacecraft will be switched to internal battery power in a few minutes.
0325 GMT (10:25 p.m. EST on Sun.)
See our Facebook page for images of today's countdown and launch!
0320 GMT (10:20 p.m. EST on Sun.)
T-minus 30 minutes and counting. Today's launch is timed for 10:50 p.m. EST (0350 GMT).

The first stage liquid oxygen tank is now being topped off to flight level.

0315 GMT (10:15 p.m. EST on Sun.)
Liquid oxygen topping continues on the Falcon 9 rocket's first and second stages.
0310 GMT (10:10 p.m. EST on Sun.)
T-minus 40 minutes. The Falcon 9 countdown is in a quiet phase now, with the two-stage rocket filled with kerosene and super-cold liquid oxygen.
0253 GMT (9:53 p.m. EST on Sun.)
Less than an hour until liftoff of SpaceX's Falcon 9 rocket with Eutelsat 115 West B and ABS 3A.

Weather conditions at Cape Canaveral are currently "go" for launch, and there is now a 90 percent chance of favorable weather at launch time. Conditions at launch are expected to be foggy with a few clouds at 2,500 feet and 12,000 feet, northeast winds at 5 to 7 mph and a temperature of 67 degrees Fahrenheit.

The Falcon 9 rocket has been fueled with kerosene and topping is underway on the liquid oxygen tanks. The cryogenic liquid oxygen tanks on the first and second stages will continue to be slowly replenished until the final minutes before launch to replace propellant that gradually boils off due to the warm ambient temperatures in Florida.

Earlier updates