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United Launch AllianceAtlas V 551Space Launch Complex 41, Cape Canaveral SFS, FL, USA
Amazon Leo (KA-01)
Launched
April 28, 2025 · 23:01 UTC
Summary
Amazon Leo (KA-01) launched on an United Launch Alliance Atlas V 551 from Space Launch Complex 41, Cape Canaveral SFS, FL, USA on April 28, 2025 at 23:01 UTC. The launch window ran from 23:00 to 01:00 UTC. It was United Launch Alliance's 165th launch, 1st this year and humanity's 6,939th orbital launch attempt. It was the 15th Atlas V 551 flight and the 1st this year. The payload was bound for low Earth orbit (LEO). The tracked orbit of Kuiper-00008, one of 27 catalogued objects, from May 5, 2025, was 463 × 478 km inclined 51.9°. 27 objects from this launch are catalogued, all of them payloads.
- Watch
- 🔴 LIVE 🔴 Rocket Launch: Atlas V Kuiper 1United Launch Alliance
- Watch live: ULA Atlas 5 launches with 27 Kuiper satellites for Amazon’s Starlink rivalSpaceflight Now
- ULA's Atlas V Launches Amazon's Project Kuiper (KA-01)NASASpaceflight
- Booster
- No booster details on record.
- Mission
- Communications · Low Earth Orbit (LEO)for Amazon
- Milestone
- 15th Atlas V 551 flight · 1st this yearUnited Launch Alliance's 165th launch1st this yearhumanity's 6,939th orbital launch attempt90th orbital launch attempt this year
Webcast
Flight preview
Simulate in Flight ClubOrbit: as tracked
Kuiper-00008 · NORAD 63724 · 2025-088 · Space-Track · tracking 1 of 27 objects
Show the numbers for orbit elements
- Object
- TBA - TO BE ASSIGNED
- Object ID
- 2025-088A
- Epoch
- 2025-05-05 20:00:01 UTC
- Mean motion
- 15.34256861 rev/day
- Eccentricity
- 0.0010697
- Inclination
- 51.8602°
- Ascending node
- 64.79°
- Arg. of perigee
- 138.6247°
- Mean anomaly
- 69.0372°
- Element set
- 999
- Rev at epoch
- 168
- B*
- 0.00066674
Perigee, apogee and period are Kepler figures from the catalogued mean elements, not a propagated state. Published orbit: LEO.
Flight timeline
- T−2.7SIgnition
- T+1SLiftoff
- T+4.1SSupersonic
- T+34.6SMax-Q
- T+45.6SBoosters Separation
- T+3M4.8SFairing Separation
- T+4M23.1SBECO
- T+4M29.1SStage 2 Separation
- T+4M39SSES-1
- T+18M14.9SSECO-1
Catalogued objects
27 catalogued: 27 payloads; 27 still in orbit
- Kuiper-00008 · NORAD 63724 · in orbit
- Kuiper-00009 · NORAD 63725 · in orbit
- Kuiper-00010 · NORAD 63726 · in orbit
- Kuiper-00011 · NORAD 63727 · in orbit
- Kuiper-00012 · NORAD 63728 · in orbit
- Kuiper-00013 · NORAD 63729 · in orbit
- Kuiper-00014 · NORAD 63730 · in orbit
- Kuiper-00015 · NORAD 63731 · in orbit
- Kuiper-00016 · NORAD 63732 · in orbit
- Kuiper-00018 · NORAD 63733 · in orbit
- Kuiper-00019 · NORAD 63734 · in orbit
- Kuiper-00020 · NORAD 63735 · in orbit
Show 15 more payloads
- Kuiper-00021 · NORAD 63736 · in orbit
- Kuiper-00023 · NORAD 63737 · in orbit
- Kuiper-00024 · NORAD 63738 · in orbit
- Kuiper-00025 · NORAD 63739 · in orbit
- Kuiper-00027 · NORAD 63740 · in orbit
- Kuiper-00028 · NORAD 63741 · in orbit
- Kuiper-00029 · NORAD 63742 · in orbit
- Kuiper-00030 · NORAD 63743 · in orbit
- Kuiper-00031 · NORAD 63744 · in orbit
- Kuiper-00032 · NORAD 63745 · in orbit
- Kuiper-00033 · NORAD 63746 · in orbit
- Kuiper-00034 · NORAD 63747 · in orbit
- Kuiper-00035 · NORAD 63748 · in orbit
- Kuiper-00037 · NORAD 63749 · in orbit
- Kuiper-00038 · NORAD 63750 · in orbit
Data from J. McDowell, planet4589.org
About this launch
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.
Pad
Space Launch Complex 41, Cape Canaveral SFS, FL, USA
115th launch from Space Launch Complex 41, 1st this year · 1,019th from Cape Canaveral SFS, FL, USA
Local pad time at liftoff: Apr 28, 7:01 PM EDT, in daylight
125 launches from this pad · 1,131 from Cape Canaveral SFS, FL, USA
206 days after the previous launch from this pad
Updates
Launch success.
Show 9 earlier updates
Liftoff.
Cosmic_Penguin · 4/28/2025 · source
New T-0.
Cosmic_Penguin · 4/28/2025 · source
Updated launch weather.
Cosmic_Penguin · 4/27/2025 · source
Rescheduled for April 28.
Cosmic_Penguin · 4/18/2025 · source
NET April 28.
Cosmic_Penguin · 4/12/2025 · source
Reverted back to April TBD.
Cosmic_Penguin · 4/12/2025 · source
NET April 14 per marine navigation warnings, TBC.
Cosmic_Penguin · 4/10/2025 · source
Scrubbed for the day, next attempt TBD.
Cosmic_Penguin · 4/10/2025 · source
New T-0.
Cosmic_Penguin · 4/10/2025 · source
Questions
When did Amazon Leo (KA-01) launch?
Amazon Leo (KA-01) launched on April 28, 2025 at 23:01 UTC. The launch window ran from 23:00 to 01:00 UTC.
Where can I watch Amazon Leo (KA-01)?
Coverage: 🔴 LIVE 🔴 Rocket Launch: Atlas V Kuiper 1; Watch live: ULA Atlas 5 launches with 27 Kuiper satellites for Amazon’s Starlink rival; ULA's Atlas V Launches Amazon's Project Kuiper (KA-01). Watch the replay
What rocket launched Amazon Leo (KA-01)?
Atlas V 551, flown by United Launch Alliance. Atlas V 551 spec sheet
Where did Amazon Leo (KA-01) launch from?
Space Launch Complex 41, Cape Canaveral SFS, FL, USA. Liftoff was Apr 28, 7:01 PM EDT local time at the pad.
What orbit did Amazon Leo (KA-01) reach?
The tracked orbit of Kuiper-00008, one of 27 catalogued objects, from May 5, 2025, was 463 × 478 km inclined 51.9°.
How many satellites did Amazon Leo (KA-01) launch?
27 payloads from this launch are catalogued, 27 of them still in orbit (Data from J. McDowell, planet4589.org).
Which program is Amazon Leo (KA-01) part of?
Amazon Leo. About Amazon Leo