United Launch AllianceAtlas V 551Space Launch Complex 41, Cape Canaveral SFS, FL, USA
Amazon Leo (KA-03)
Launched
September 25, 2025 · 12:09 UTC
Image: United Launch Alliance
Summary
Amazon Leo (KA-03) launched on an United Launch Alliance Atlas V 551 from Space Launch Complex 41, Cape Canaveral SFS, FL, USA on September 25, 2025 at 12:09 UTC. The launch window ran from 12:09 to 12:38 UTC. It was United Launch Alliance's 168th launch, 4th this year and humanity's 7,072nd orbital launch attempt. It was the 17th Atlas V 551 flight and the 3rd this year. The payload was bound for low Earth orbit (LEO). Kuiper-00120, one of 27 catalogued objects, reached a 464 × 479 km orbit inclined 51.9°. 27 objects from this launch are catalogued, all of them payloads.
- Watch
- Rocket Launch: Atlas V Kuiper 3United Launch Alliance
- Watch live: ULA Atlas 5 launches 27 Kuiper satellites for Amazon on Atlas 5 rocketSpaceflight Now
- ULA Atlas V Launches Project Kuiper (KA-03)NASASpaceflight
- Booster
- No booster details on record.
- Mission
- Communications · Low Earth Orbit (LEO)for Amazon
- Milestone
- 17th Atlas V 551 flight · 3rd this yearUnited Launch Alliance's 168th launch4th this yearhumanity's 7,072nd orbital launch attempt223rd orbital launch attempt this year
Webcast
Flight preview
Simulate in Flight ClubOrbit: as tracked
Kuiper-00120 · NORAD 65762 · 2025-217 · Space-Track · tracking 1 of 27 objects
Show the numbers for orbit elements
- Object
- KUIPER-00120
- Object ID
- 2025-217A
- Epoch
- 2025-09-25 16:46:44 UTC
- Mean motion
- 15.33791109 rev/day
- Eccentricity
- 0.00109911
- Inclination
- 51.8675°
- Ascending node
- 81.4801°
- Arg. of perigee
- 119.3525°
- Mean anomaly
- 240.8559°
- Element set
- 999
- Rev at epoch
- 4
- B*
- 0.0023006785
Perigee, apogee and period are Kepler figures from the catalogued mean elements, not a propagated state. Published orbit: LEO. Ascent drawn from padside's representative profile.
Flight timeline
- T−2.7SIgnition
- T+1SLiftoff
- T+34.7SSupersonic
- T+52.7SMax-Q
- T+1M46.6SBoosters Separation
- T+3M4.7SFairing Separation
- T+4M22.8SBECO
- T+4M28.8SStage 2 Separation
- T+4M38.8SSES-1
- T+17M32.8SSECO-1
- T+20M21.8SPayload Deployment Sequence Start
- T+35M11.8SPayload Deployment Sequence End
- T+54M14.7SSES-2
- T+54M25.7SSECO-2
- T+1H9M0.7SMission End
Catalogued objects
27 catalogued: 27 payloads; 25 still in orbit
- Kuiper-00120 · NORAD 65762 · in orbit
- Kuiper-00132 · NORAD 65763 · in orbit
- Kuiper-00133 · NORAD 65764 · in orbit
- Kuiper-00139 · NORAD 65765 · in orbit
- Kuiper-00142 · NORAD 65766 · in orbit
- Kuiper-00145 · NORAD 65767 · in orbit
- Kuiper-00147 · NORAD 65768 · in orbit
- Kuiper-00148 · NORAD 65769 · in orbit
- Kuiper-00150 · NORAD 65770 · in orbit
- Kuiper-00151 · NORAD 65771 · in orbit
- Kuiper-00152 · NORAD 65772 · in orbit
- Kuiper-00153 · NORAD 65773 · in orbit
Show 15 more payloads
- Kuiper-00155 · NORAD 65774 · in orbit
- Kuiper-00156 · NORAD 65775 · in orbit
- Kuiper-00158 · NORAD 65776 · in orbit
- Kuiper-00163 · NORAD 65777 · re-entered July 26, 2026
- Kuiper-00165 · NORAD 65778 · in orbit
- Kuiper-00166 · NORAD 65779 · in orbit
- Kuiper-00167 · NORAD 65780 · in orbit
- Kuiper-00168 · NORAD 65781 · in orbit
- Kuiper-00169 · NORAD 65782 · in orbit
- Kuiper-00170 · NORAD 65783 · in orbit
- Kuiper-00171 · NORAD 65784 · re-entered February 8, 2026
- Kuiper-00172 · NORAD 65785 · in orbit
- Kuiper-00173 · NORAD 65786 · in orbit
- Kuiper-00174 · NORAD 65787 · in orbit
- Kuiper-00176 · NORAD 65788 · 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
118th launch from Space Launch Complex 41, 4th this year · 1,056th from Cape Canaveral SFS, FL, USA
Local pad time at liftoff: Sep 25, 8:09 AM EDT, in daylight
125 launches from this pad · 1,131 from Cape Canaveral SFS, FL, USA
43 days after the previous launch from this pad
Updates
Launch success.
Show 8 earlier updates
Liftoff.
Cosmic_Penguin · 9/25/2025 · source
Official Webcast by United Launch Alliance has started
LL2 · 9/25/2025 · source
Tweaked T-0.
Cosmic_Penguin · 9/25/2025 · source
Updated launch weather, 95% GO.
Cosmic_Penguin · 9/24/2025 · source
Updated launch weather, 85% GO.
Cosmic_Penguin · 9/22/2025 · source
GO for launch.
Cosmic_Penguin · 9/16/2025 · source
NET September 25.
Cosmic_Penguin · 8/29/2025 · source
NET September (see https://x.com/gewoonlukas_/status/1955514741960642825).
Cosmic_Penguin · 8/13/2025 · source
Questions
When did Amazon Leo (KA-03) launch?
Amazon Leo (KA-03) launched on September 25, 2025 at 12:09 UTC. The launch window ran from 12:09 to 12:38 UTC.
Where can I watch Amazon Leo (KA-03)?
Coverage: Rocket Launch: Atlas V Kuiper 3; Watch live: ULA Atlas 5 launches 27 Kuiper satellites for Amazon on Atlas 5 rocket; ULA Atlas V Launches Project Kuiper (KA-03). Watch the replay
What rocket launched Amazon Leo (KA-03)?
Atlas V 551, flown by United Launch Alliance. Atlas V 551 spec sheet
Where did Amazon Leo (KA-03) launch from?
Space Launch Complex 41, Cape Canaveral SFS, FL, USA. Liftoff was Sep 25, 8:09 AM EDT local time at the pad.
What orbit did Amazon Leo (KA-03) reach?
Kuiper-00120, one of 27 catalogued objects, reached a 464 × 479 km orbit inclined 51.9°.
How many satellites did Amazon Leo (KA-03) launch?
27 payloads from this launch are catalogued, 25 of them still in orbit (Data from J. McDowell, planet4589.org).
Which program is Amazon Leo (KA-03) part of?
Amazon Leo. About Amazon Leo