In flight Falcon 9 Block 5 | USSF-481 Watch
Photo: Bill Ingalls · Public domain (US government)

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USSF-259

Success Launch Successful SpaceX, Falcon 9 Block 5

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Mission: USSF-259

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.

Customers: United States Space Force

Where to watch

Official Webcast USSF-259 Mission SpaceX · English Unofficial Re-stream SpaceX USSF-259 The Space Devs · English Unofficial Webcast SpaceX Falcon 9 rocket launches from California on secretive U.S. Space Force mission Spaceflight Now · English

Timeline

  1. T−00:38:00 GO for Prop Load
  2. T−00:35:00 Prop Load
  3. T−00:35:00 Stage 1 LOX Load
  4. T−00:16:00 Stage 2 LOX Load
  5. T−00:07:00 Engine Chill
  6. T−00:01:00 Tank Press
  7. T−00:01:00 Startup
  8. T−00:00:45 GO for Launch
  9. T−00:00:03 Ignition
  10. T+00:00:00 Liftoff
  11. T+00:01:07 Max-Q
  12. T+00:02:26 MECO
  13. T+00:02:30 Stage 2 Separation
  14. T+00:02:36 SES-1
  15. T+00:02:57 Fairing Separation
  16. T+00:06:03 Entry Burn Startup
  17. T+00:06:24 Entry Burn Shutdown
  18. T+00:07:58 Stage 1 Landing Burn
  19. T+00:08:20 Stage 1 Landing

Updates

  • Launch success. source
  • Liftoff. source
  • Unofficial Re-stream by SPACE AFFAIRS has started source
  • Now targeting Sep 17 at 01:07 UTC source
  • Scrubbed for the day. source
  • Now targeting Sep 16 at 02:18 UTC source
  • Now targeting Sep 16 at 01:29 UTC source
  • Added launch. source