USSF-259
Falcon 9 Block 5. Space Launch Complex 4E, Vandenberg SFB, CA, USA.
Launch Successful
- Recovery
- B1097: Autonomous Spaceport Drone Ship, Of Course I Still Love You, successful
1 Landed
- Your Time
- UTC
- At the Pad
USSF-259
SpaceX
Mission
Government/Top Secret, Polar Orbit
USSF-259 is a classified mission for the United States Space Force. It is possibly a batch of classified LEO satellites based on SpaceX’s Starshield satellite bus, based on locations of ascent rocket stage drop zones being fits with previous SDA Transport Layer launches.
Countdown Sequence
Planned offsets from T-0; confirmations link to their sources
Sequence Ended · Success
- T−00:38:00
GO for Prop Load
Launch director verifies go for propellant load
Planned Time Elapsed
- T−00:35:00
Prop Load
Start of propelland loading
Planned Time Elapsed
- T−00:35:00
Stage 1 LOX Load
Start of liquid oxygen loading in the first stage
Planned Time Elapsed
- T−00:16:00
Stage 2 LOX Load
Start of liquid oxygen loading in the second stage
Planned Time Elapsed
- T−00:07:00
Engine Chill
Start of engine chilling
Planned Time Elapsed
- T−00:01:00
Tank Press
Fuel tanks are pressurized to flight levels
Planned Time Elapsed
- T−00:01:00
Startup
The onboard computer takes control over the countdown and runs last checks
Planned Time Elapsed
- T−00:00:45
GO for Launch
Launch director verifies go for launch
Planned Time Elapsed
- T−00:00:03
Ignition
Start of the engine ignition sequence
Planned Time Elapsed
- T+00:00:00
- T+00:01:07
Max-Q
Maximum dynamic pressure
Planned Time Elapsed
- T+00:02:26
MECO
Cut-off of the main engine
Planned Time Elapsed
- T+00:02:30
Stage 2 Separation
Separation of the second stage from the first
Planned Time Elapsed
- T+00:02:36
SES-1
First start of the second engine
Planned Time Elapsed
- T+00:02:57
Fairing Separation
Separation of the payload fairing
Planned Time Elapsed
- T+00:06:03
Entry Burn Startup
Start of the atmospheric entry burn
Planned Time Elapsed
- T+00:06:24
Entry Burn Shutdown
End of the atmospheric entry burn
Planned Time Elapsed
- T+00:07:58
Stage 1 Landing Burn
Start of the first stage landing burn
Planned Time Elapsed
- T+00:08:20
Stage 1 Landing
Landing of the first stage
Planned Time Elapsed
Change Log
Detected changes and source updates
Launch success.
Liftoff.
Unofficial Re-stream by SPACE AFFAIRS has started
Now targeting Sep 17 at 01:07 UTC
Scrubbed for the day.
Now targeting Sep 16 at 02:18 UTC
Now targeting Sep 16 at 01:29 UTC
Added launch.