Follow the key events of the Falcon 9 rocket’s ascent to orbit with five more Iridium Next communications satellite and the U.S.-German GRACE-Follow On climate research mission.
The 229-foot-tall (70-meter) rocket will lift off Friday at 12:47:58 p.m. PDT (3:47:58 p.m. EDT; 1947:58 GMT) Tuesday from Vandenberg Air Force Base in California.
SpaceX will not attempt to recover the first stage on Tuesday’s mission.
Data source: SpaceX
T-0:00:00: Liftoff
After the rocket’s nine Merlin 1D engines pass an automated health check, the Falcon 9 is released from Space Launch Complex 4-East at Vandenberg Air Force Base, California.
T+0:01:19: Max-Q
The Falcon 9 rocket reaches Max Q, the point of maximum aerodynamic pressure. The first stage’s nine Merlin 1D engines produce about 1.7 million pounds of thrust.
T+0:02:46: MECO
The Falcon 9’s nine Merlin 1D engines shut down.
T+0:02:49: Stage 1 Separation
The Falcon 9’s first stage separates from the second stage moments after MECO.
T+0:02:57: Stage 2 Ignition
The second stage Merlin 1D vacuum engine ignites for an approximately 6-and-a-half-minute burn to inject the Iridium Next and GRACE-Follow On satellites into a parking orbit.
T+0:03:12: 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+0:10:13: SECO 1
The Merlin 1D vacuum engine turns off after placing the Iridium and GRACE-Follow On satellites into the first of two targeted orbits at an altitude of around 304 miles (490 kilometers) and an inclination of 89 degrees.
T+0:11:33: GRACE-Follow On Separation
The twin 1,323-pound (600-kilogram) GRACE-Follow On satellites separate in opposite directions from the Falcon 9 rocket’s second stage.
T+0:56:55: Stage 2 Restart
The Falcon 9’s second stage engine ignites again for an 8-second burn to raise its orbit to around 372 miles (600 kilometers) in altitude and adjust its inclination to better align with the Iridium satellite constellation orbiting at an angle of 86.4 degrees to the equator.
T+0:57:03: SECO 2
The Merlin 1D vacuum engine shuts down after its brief restart.
T+1:05:48: Begin Iridium Deployments
The 1,896-pound (860-kilogram) Iridium Next satellites begin deploying from their dispenser on the Falcon 9 rocket’s second stage, separating at intervals of approximately every 90 seconds.
T+1:12:28: End Iridium Deployments
The last of the five Iridium Next satellites will separate from the rocket.
A Proton rocket lifted off from the Baikonur Cosmodrome in Kazakhstan with the Spektr-RG X-ray astronomy mission at 1230:57 GMT (8:30:57 a.m. EDT) Saturday.
The announcement Monday of the discovery of phosphine gas in the clouds of Venus — an indicator of possible life — has raised hopes among scientists for new robotic missions to renew exploration of Earth’s planetary neighbor. If Rocket Lab founder Peter Beck gets his way, a privately-funded mission could get the next crack at probing Venus’s soupy atmosphere.
NASA officials said Tuesday the weekend test-firing of the Space Launch System moon rocket’s core stage was cut short by an out-of-limits parameter in a hydraulic system for gimbaling, or vectoring, one of its engines. NASA Administrator Jim Bridenstine told Spaceflight Now engineers are “feeling pretty good” about the data gathered during the shortened test-firing, and managers may decide to ship the SLS core stage to the Kennedy Space Center for launch preparations without re-attempting the planned eight-minute hot fire.
