SpaceX’s Falcon 9 rocket is set for liftoff from Cape Canaveral early Thursday, heading due east over the Atlantic Ocean to deliver the EchoStar 23 communications satellite into orbit 34 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 1:35 a.m. EDT (0535 GMT) Thursday at the opening of a 150-minute launch window.
Perched atop the rocket is the EchoStar 23 communications satellite, a spacecraft made by Space Systems/Loral, ready to beam television programming across Brazil for EchoStar Satellite Services The rocket will place the satellite into a high-altitude geosynchronous transfer orbit.
The timeline below outlines the launch sequence for the Falcon 9 flight with EchoStar 23. On this mission, SpaceX does not plan to attempt a recovery of the rocket’s first stage booster due to the high performance required to place the heavy EchoStar 23 spacecraft into a high-altitude orbit.
The Falcon 9 does not carry landing legs, the first SpaceX launch without landing gear since April 2015.
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+0:01:13: Mach 1
The Falcon 9 rocket reaches Mach 1, the speed of sound, as the nine Merlin 1D engines provide more than 1.5 million pounds of thrust.
T+0:01:16: Max Q
The Falcon 9 rocket reaches Max Q, the point of maximum aerodynamic pressure.
T+0:02:43: MECO
The Falcon 9’s nine Merlin 1D engines shut down.
T+0:02:47: Stage 1 Separation
The Falcon 9’s first stage separates from the second stage moments after MECO.
T+0:02:55: First Ignition of Second Stage
The second stage Merlin 1D vacuum engine ignites for a nearly 6-minute burn to put the rocket and EchoStar 23 into a preliminary parking orbit.
T+0:03:43: 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+0:08:31: SECO 1
The second stage of the Falcon 9 rocket shuts down after reaching a preliminary low-altitude orbit. The upper stage and EchoStar 23 begin a coast phase scheduled to last nearly 18 minutes before the second stage Merlin vacuum engine reignites.
T+0:26:19: Second Ignition of Second Stage
The Falcon 9’s second stage Merlin engine restarts to propel the EchoStar 23 communications satellite into a geostationary transfer orbit.
T+0:27:19: SECO 2
The Merlin engine shuts down after a short burn to put the EchoStar 23 satellite in the proper orbit for deployment.
T+0:34:00: EchoStar 23 Separation
The EchoStar 23 satellite separates from the Falcon 9 rocket in a geostationary transfer orbit. SpaceX and EchoStar have not released the exact orbit targeted on tonight’s launch.
The center section of SpaceX’s first Falcon Heavy rocket has been test-fired at the launch company’s test facility in Central Texas, a sign of progress toward the behemoth booster’s long-delayed maiden mission scheduled some time in the final months of 2017.
The NROL-105 mission is the first of about a dozen missions planned for 2026 that support the NRO’s so-called proliferated architecture satellite constellation. Liftoff from pad 4E at Vandenberg Space Force Base happened at 8:39:51 p.m. PST (11:39:51 p.m. EST / 0439:51 UTC).
A French-built communications satellite for Russia’s Gazprom Space Systems launched May 30 is maneuvering toward its final operating location in geostationary orbit using a set of backup thrusters after the spacecraft encountered a problem with its main engine.
