Recorded mission
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SpaceX
Falcon 9 Block 5 | USSF-124
Recorded mission coverage
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Mission brief
The mission at a glance.
2 satellites, one by L3Harris and the other by Northrop Grumman, will be launched as the Hypersonic and Ballistic Tracking Space Sensor (HBTSS) mission for the US Missile Defense Agency. These satellites have improved sensitivity to detect and track hypersonic missiles with fainter signatures. 4 SDA Tranche 0 Tracking Layer missile warning satellites by L3Harris will also be on board.
Open the full mission →Published flight sequence
Know what comes next.
Planned timings relative to the target. These steps do not indicate live progress.
- T−00:38:00
GO for Prop Load
- T−00:35:00
Stage 1 LOX Load
- T−00:35:00
Prop Load
- T−00:16:00
Stage 2 LOX Load
- T−00:07:00
Engine Chill
- T−00:01:00
Startup
See all 21 published steps ↓
- T−00:01:00
Tank Press
- T−00:00:45
GO for Launch
- T−00:00:03
Ignition
- T+00:00:00
Liftoff
- T+00:01:12
Max-Q
- T+00:02:16
MECO
- T+00:02:19
Stage 2 Separation
- T+00:02:27
SES-1
- T+00:02:32
Booster Boostback Burn Startup
- T+00:03:08
Fairing Separation
- T+00:03:26
Booster Boostback Burn Shutdown
- T+00:06:16
Entry Burn Startup
- T+00:06:34
Entry Burn Shutdown
- T+00:07:32
Stage 1 Landing Burn
- T+00:08:01
Stage 1 Landing