SpaceX’s Falcon 9 rocket is set for liftoff from Cape Canaveral on Wednesday evening, heading due east over the Atlantic Ocean to deliver the SES 11/EchoStar 105 communications satellite into orbit 36 minutes later.
The 229-foot-tall (70-meter) rocket is poised for launch from pad 39A at NASA’s Kennedy Space Center in Florida at 6:53 p.m. EDT (2253 GMT) Wednesday at the opening of a two-hour launch window.
Perched atop the rocket is the SES 11/EchoStar 105 communications satellite, a spacecraft made by Airbus Defense and Space, ready to beam television programming and video services across the Americas for SES and EchoStar. The rocket will place the satellite into a high-altitude supersynchronous transfer orbit.
The timeline below outlines the launch sequence for the Falcon 9 flight with SES 11/EchoStar 105, SpaceX’s third launch with a previously-flown first stage booster.
Data source: SpaceX
T-0:00:00: Liftoff
After the rocket’s nine Merlin engines pass an automated health check, hold-down clamps will release the Falcon 9 booster for liftoff from pad 39A.
T+0:01:10: Mach 1
The Falcon 9 rocket reaches Mach 1, the speed of sound, as the nine Merlin 1D engines provide more than 1.7 million pounds of thrust.
T+0:01:18: Max Q
The Falcon 9 rocket reaches Max Q, the point of maximum aerodynamic pressure.
T+0:02:35: MECO
The Falcon 9’s nine Merlin 1D engines shut down.
T+0:02:38: Stage 1 Separation
The Falcon 9’s first stage separates from the second stage moments after MECO.
T+0:02:40: First Ignition of Second Stage
The second stage Merlin 1D vacuum engine ignites for a six-minute burn to put the rocket and SES 11/EchoStar 105 into a preliminary parking orbit.
T+0:03:40: Fairing Jettison
The 5.2-meter (17.1-foot) diameter payload fairing jettisons once the Falcon 9 rocket ascends through the dense lower atmosphere. The 43-foot-tall fairing is made of two clamshell-like halves composed of carbon fiber with an aluminum honeycomb core.
T+0:06:24: Stage 1 Entry Burn
A subset of the first stage’s Merlin 1D engines ignite for an entry burn to slow down for landing. A final landing burn will occur just before touchdown.
T+0:08:33: Stage 1 Landing
The Falcon 9 rocket’s first stage booster touches down on SpaceX’s drone ship in the Atlantic Ocean.
T+0:08:38: SECO 1
The second stage of the Falcon 9 rocket shuts down after reaching a preliminary low-altitude orbit. The upper stage and SES 11/EchoStar 105 begin a coast phase scheduled to last more than 18 minutes before the second stage Merlin vacuum engine reignites.
T+0:26:59: Second Ignition of Second Stage
The Falcon 9’s second stage Merlin engine restarts to propel the SES 11/EchoStar 105 communications satellite into a supersynchronous transfer orbit.
T+0:27:58: SECO 2
The Merlin engine shuts down after a short burn to put the SES 11/EchoStar 105 satellite in the proper orbit for deployment. The rocket’s computer is programmed to shut down the upper stage engine just before it runs out of propellant, ensuring the payload reaches the highest orbit possible to extend its useful lifetime. The satellite should be injected in an orbit with a high point, or apogee, around 24,300 miles (39,100 kilometers), but the exact altitude depends on the engine’s fuel use.
T+0:36:07: SES 11/EchoStar 105 Separation
The SES 11/EchoStar 105 satellite separates from the Falcon 9 rocket in a supersynchronous transfer orbit.
SpaceX’s third Falcon Heavy rocket is set for liftoff from NASA’s Kennedy Space Center in Florida, and the heavy-lift launcher will head on an easterly course over the Atlantic Ocean atop more than 5 million pounds of thrust.
Former NASA astronaut Peggy Whitson, with more time in space than any other American, rocketed back into orbit for the fourth time Sunday, riding a SpaceX Falcon 9 launcher from Florida with a fare-paying investor and private pilot, and the first two Saudi Arabian astronauts to fly to the International Space Station.
SpaceX’s Falcon 9 rocket flew its 300th mission on Thursday Feb. 16, lifting off from Vandenberg Space Force Base in California at 1:34 p.m. PST (4:34 p.m. EST, 2134 UTC) carrying another batch of satellites for the company’s Starlink internet service.
