Falcon Heavy | Nancy Grace Roman Space Telescope

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Broadcast links from Launch Library 2. The player is YouTube’s privacy-enhanced embed, which sets nothing until you press play. Some broadcasters switch embedding off for their own streams — if the player will not start, the link above opens it on YouTube.

Every milestone the provider published for this flight.

1. T-53:00GO for Prop LoadLaunch director verifies go for propellant load
2. T-50:00Stage 1 Propellant LoadStart of propellant loading in the first stage
3. T-45:00Stage 1 LOX LoadStart of liquid oxygen loading in the first stage
4. T-35:00Stage 2 Propellant LoadStart of propellant loading in the second stage
5. T-18:30Stage 2 LOX LoadStart of liquid oxygen loading in the second stage
6. T-7:00Engine ChillStart of engine chilling
7. T-0:59StartupThe onboard computer takes control over the countdown and runs last checks
8. T-0:45GO for LaunchLaunch director verifies go for launch
9. T-0:20Tank PressFuel tanks are pressurized to flight levels
10. T-0:06IgnitionStart of the engine ignition sequence
11. T+0:00LiftoffFirst upwards movement of the rocket
12. T+1:08Max-QMaximum dynamic pressure
13. T+2:24SBECOCut-off of the side boosters
14. T+2:27Boosters SeparationSeparation of the side boosters
15. T+2:32Boosters FlipFlip maneuver of the side boosters
16. T+2:43Boosters Boostback Burn StartupStart of the boosters boostback burn
17. T+3:48Boosters Boostback Burn ShutdownEnd of the boosters boostback burn
18. T+3:51MECOCut-off of the main engine
19. T+3:54Stage 2 SeparationSeparation of the second stage from the first
20. T+4:00SES-1First start of the second engine
21. T+4:15Fairing SeparationSeparation of the payload fairing
22. T+6:19Boosters Entry Burn StartupStart of the boosters atmospheric entry burn
23. T+6:29Boosters Entry Burn ShutdownEnd of the boosters atmospheric entry burn
24. T+7:23Boosters Landing BurnStart of the boosters landing burn
25. T+7:40Boosters LandingLanding of the boosters
26. T+8:28SECO-1First cut-off of the second engine
27. T+24:33SES-2Second start of the second engine
28. T+26:32SECO-2Second cut-off of the second engine
29. T+31:31Payload SeparationFinal deployment of the payload from the rocket

Planned times, published by the launch provider and carried by Launch Library 2 — not measurements. No public feed streams a rocket’s altitude or velocity during ascent, so this site does not show any. Times can move, and a hold moves everything after it.