SpaceX’s Falcon 9 rocket is set for liftoff from Cape Canaveral on Friday afternoon, heading due east over the Atlantic Ocean to deliver the BulgariaSat 1 communications satellite into orbit 35 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 2:10 p.m. EDT (1810 GMT) Friday at the opening of a two-hour launch window.
Perched atop the rocket is the BulgariaSat 1 communications satellite, a spacecraft made by Space Systems/Loral, ready to beam television programming across Bulgaria and neighboring countries in the Balkans. 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 BulgariaSat 1, SpaceX’s second 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+0:01:19: Max Q
The Falcon 9 rocket reaches Max Q, the point of maximum aerodynamic pressure.
T+0:02:36: MECO
The Falcon 9’s nine Merlin 1D engines shut down.
T+0:02:40: Stage 1 Separation
The Falcon 9’s first stage separates from the second stage moments after MECO.
T+0:02:47: First Ignition of Second Stage
The second stage Merlin 1D vacuum engine ignites for a nearly 6-minute burn to put the rocket and BulgariaSat 1 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+0:06:19: 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+0:08:31: 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 BulgariaSat 1 begin a coast phase scheduled to last more than 18 minutes before the second stage Merlin vacuum engine reignites.
T+0:27:08: Second Ignition of Second Stage
The Falcon 9’s second stage Merlin engine restarts to propel the BulgariaSat 1 communications satellite into a supersynchronous transfer orbit.
T+0:28:13: SECO 2
The Merlin engine shuts down after a short burn to put the BulgariaSat 1 satellite in the proper orbit for deployment.
T+0:34:55: BulgariaSat 1 Separation
The BulgariaSat 1 satellite separates from the Falcon 9 rocket in a supersynchronous transfer orbit.
SpaceX’s first human-rated Crew Dragon spacecraft took off Saturday from historic launch pad 39A at the Kennedy Space Center in Florida, launching NASA astronauts Doug Hurley and Bob Behnken on the first piloted orbital space mission from a U.S. spaceport in nearly a decade.
The Starlink 15-5 was SpaceX’s 59th Falcon 9 launch of the year. Liftoff from pad 4 East at Vandneberg Space Force Base happened at 6:43 a.m. PDT (9:43 a.m. EDT, 1343 UTC).
Overcoming 50-50 weather odds, SpaceX launched a Falcon 9 rocket from Cape Canaveral Thursday morning on its 44th Starlink delivery mission of the year. Liftoff from Space Launch Complex 40 occurred at 1:36 a.m. EDT (0536 UTC), the fourth launch opportunity of the window.
