EDITOR’S NOTE: Updated to reflect new launch attempt May 23.
Follow the key events of the Falcon 9 rocket’s ascent to orbit 60 satellites for SpaceX’s Starlink broadband network.
The 229-foot-tall (70-meter) rocket will lift off Thursday during a 90-minute opening at 10:30 p.m. EDT (0230 GMT Friday) from the Complex 40 launch pad at Cape Canaveral Air Force Station in Florida.
The Falcon 9 will head northeast from Cape Canaveral over the Atlantic Ocean to place the 60 Starlink satellites into a circular orbit around 273 miles (440 kilometers) above Earth.
The Falcon 9’s first stage will target a landing on SpaceX’s drone ship “Of Course I Still Love You” in the Atlantic Ocean nearly 400 miles northeast of Cape Canaveral.
The first stage booster launching tonight previous flew on two missions — the Telstar 18 VANTAGE launch from Florida in September 2018 and SpaceX’s eighth mission for Iridium from California in January.
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 40.
T+0:01:13: Max Q
The Falcon 9 rocket reaches Max Q, the point of maximum aerodynamic pressure, a few seconds after surpassing the speed of sound.
T+0:02:31: MECO
The Falcon 9’s nine Merlin 1D engines shut down.
T+0:02:34: Stage 1 Separation
The Falcon 9’s first stage separates from the second stage moments after MECO.
T+0:02:41: Stage 2 Ignition
The second stage Merlin 1D vacuum engine ignites for an approximately 6-minute burn to inject the Starlink satellites into a parking orbit.
T+0:03:33: 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+0:06:43: Stage 1 Entry Burn Complete
A subset of the first stage’s Merlin 1D engines completes an entry burn to slow down for landing. A final landing burn will occur just before touchdown on SpaceX’s drone ship “Of Course I Still Love You” around 385 miles (620 kilometers) northeast of Cape Canaveral.
T+0:08:17: Stage 1 Landing
The Falcon 9 rocket’s first stage booster touches down on SpaceX’s drone ship in the Atlantic Ocean.
T+0:08:46: SECO 1
The Merlin 1D vacuum engine turns off after placing the Starlink satellites in a temporary parking orbit, beginning a 37-minute coast in space.
T+0:46:11: Stage 2 Restart
The Falcon 9’s second stage engine ignites again for a 3-second burn to circularize its orbit.
T+0:46:14: SECO 2
The Merlin 1D vacuum engine shuts down after reaching a target orbit about 273 miles (440 kilometers) high with an inclination of approximately 53 degrees.
T+1:02:14: Begin Starlink Deployments
The 60 flat-panel Starlink satellites, each with a mass of about 500 pounds (227 kilograms) begin deploying from the Falcon 9 rocket’s second stage.
Setting new commercial launch and satellite industry records, a SpaceX Falcon 9 rocket propelled by a first stage booster launched and recovered two times before soared into a clear morning sky over California’s Central Coast on Monday with 64 small satellites, then returned to a pinpoint landing on a vessel parked offshore in the Pacific Ocean, potentially to be flown again.
Rocket Lab’s second Electron booster lifted off from New Zealand’s North Island on Saturday, U.S. time, and reached orbit after an eight-minute climb over the Pacific Ocean. Liftoff with three commercial CubeSats occurred at 8:43 p.m. EST Saturday (0143 GMT; 2:43 p.m. New Zealand time Sunday).
SpaceX’s next launch of satellites for the company’s Starlink broadband network — planned in the final days of 2019 — will carry one spacecraft with an experimental coating designed to make it less reflective in orbit, a first step in assuaging concerns from scientists who say the deployment of thousands more Starlink stations would impede some astronomical observations.
