Aurora
Tuning into the cosmos…
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Atlas V 551 | Amazon Leo (LA-05)
Atlas V 551 | Amazon Leo (LA-05) launched on Sat, Apr 4, 2026, 05:46 AM UTC — a United Launch Alliance mission.
Launch SuccessfulUnited Launch Alliance
Lifted offNET Apr 2026
NET Sat, Apr 4, 2026, 05:46 AM UTC
Live coverage
Watch the webcasts
3 streams available — switch between the provider’s feed, X and others.
Mission profile
The flight at a glance
Atlas V 551Vehicle
United Launch AllianceProvider
Space Launch Complex 41Pad
Cape Canaveral SFS, FL, USALocation
Amazon LeoProgram
CommunicationsMission type
Low Earth OrbitOrbit
Flight sequence
Mission timeline
Key events from liftoff — ignition, staging, separation and deployment — with their times relative to T0.
- IgnitionT- 00:00:03
- LiftoffT+ 00:00:01
- SupersonicT+ 00:00:35
- Max-QT+ 00:00:53
- Boosters SeparationT+ 00:01:47
- Fairing SeparationT+ 00:03:05
- BECOT+ 00:04:22
- Stage 2 SeparationT+ 00:04:28
- SES-1T+ 00:04:38
- SECO-1T+ 00:18:21
- Payload Deployment Sequence StartT+ 00:21:10
- Payload Deployment Sequence EndT+ 00:37:41
- SES-2T+ 00:54:53
- SECO-2T+ 00:55:02
Flight simulation
Ascent to orbit
A representative gravity-turn climb for Atlas V 551 to Low Earth Orbit. Illustrative model — not this mission’s live telemetry.
Mission timeT+0:00
Altitude0.0 km
Velocity0.00 km/s
PhaseLiftoff
T+0:00 / 8:00
SimulatedRepresentative Atlas V 551 ascent profile — illustrative model, not this mission’s live telemetry.
The mission
Amazon Leo (LA-05)
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. 29 satellites are carried on this launch.
Around this launch
Related news
No news linked to this launch yet
As coverage publishes, deduplicated articles about this mission will appear here.
Good to know
Frequently asked
What time does Atlas V 551 | Amazon Leo (LA-05) launch?
Atlas V 551 | Amazon Leo (LA-05) is scheduled to lift off Sat, Apr 4, 2026, 05:46 AM UTC.
Where can I watch Atlas V 551 | Amazon Leo (LA-05)?
Watch the official live webcast embedded on this page — it goes live shortly before liftoff.
Who is launching Atlas V 551 | Amazon Leo (LA-05)?
Atlas V 551 | Amazon Leo (LA-05) is an United Launch Alliance mission flying on a Atlas V 551.
Where does Atlas V 551 | Amazon Leo (LA-05) launch from?
It lifts off from Space Launch Complex 41, Cape Canaveral SFS, FL, USA.