Atlas V 551 | Amazon Leo (LA-04)

Amazon Leo, formerly known as Project Kuiper, is a mega constellation of satellites in Low Earth Orbit that will offer broadband internet access, this constellation will be managed by Kuiper Systems LLC, a subsidiary of Amazon. This constellation is planned to be composed of 3,276 satellites. The satellites are projected to be placed in 98 orbital planes in three orbital layers, one at 590 km, 610 km and 630 km altitude. 27 satellites are carried on this launch.

Communications · Low Earth Orbit (LEO)

No booster details available.

• Rocket Launch: Atlas V Leo 4 — United Launch Alliance
• Watch live: ULA Atlas 5 rocket launches 27 Amazon Leo satellites from Cape Canaveral — Spaceflight Now
• ULA Atlas V 551 launches Amazon Leo Atlas 4 (LA-04) — NASASpaceflight

1. T−2.7SIgnition
2. T+1SLiftoff
3. T+34.7SSupersonic
4. T+52.7SMax-Q
5. T+1M46.6SBoosters Separation
6. T+3M4.7SFairing Separation
7. T+4M22.8SBECO
8. T+4M28.8SStage 2 Separation
9. T+4M38.8SSES-1
10. T+17M32.8SSECO-1
11. T+20M21.8SPayload Deployment Sequence Start
12. T+35M11.8SPayload Deployment Sequence End
13. T+54M14.7SSES-2
14. T+54M25.7SSECO-2
15. T+1H9M0.7SMission End

• Launch success.

  Cosmic_Penguin · 12/16/2025 · source

• Liftoff

  Nosu · 12/16/2025 · source

• Official Webcast by United Launch Alliance has started

  LL2 · 12/16/2025 · source

• Updated launch weather.

  Cosmic_Penguin · 12/16/2025 · source

• Delayed to December 16 due to launch site ground winds.

  Cosmic_Penguin · 12/14/2025 · source

• Updated launch weather, 20% GO.

  Cosmic_Penguin · 12/13/2025 · source

• Updated launch weather, 65% GO.

  Cosmic_Penguin · 12/12/2025 · source

• Updated launch window.

  Cosmic_Penguin · 12/8/2025 · source

• Tweaked T-0.

  Cosmic_Penguin · 12/1/2025 · source

• NET December 15.

  Cosmic_Penguin · 11/21/2025 · source