Launch Detail

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Name: Atlas V 551 | Amazon Leo (KA-03)
Start: 2025-09-25T12:09:00.000Z
End: 2025-09-25T12:38:00.000Z
Location: Space Launch Complex 41

Pulling launch timing, vehicle context, weather signals, and mission evidence.

Launch detail

Atlas V 551 | Amazon Leo (KA-03)

United Launch Alliance • Atlas V 551 • Space Launch Complex 41 (FL)

Updates every 2 hours.Aligned to 12:00am, 2:00am, 4:00am, … local time.

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SuccessROUTINE

Amazon Leo (KA-03)

United Launch Alliance • Atlas V 551 • SLC-41

T-00h:00m:00s

Sep 25, 12:09 PM UTC

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.

Rocket profile

Atlas V 551

Variant: 551

Length: 59.7 m

Diameter: 3.8 m

Reusable: No

Launch

Photo credit: United Launch Alliance•License: ULA Image Use Policy•Single-use

Manufacturer

Milestone map

Flight plan

Live targets are highlighted across the sequence.

T-0:03Sep 25, 2025, 8:09 AM EDT
Ignition
Start of the engine ignition sequence
T+0:01Sep 25, 2025, 8:09 AM EDT
Liftoff
First upwards movement of the rocket
T+0:35Sep 25, 2025, 8:10 AM EDT
Supersonic
Vehicle is supersonic
T+0:53Sep 25, 2025, 8:10 AM EDT
Max-Q
Maximum dynamic pressure
T+1:47Sep 25, 2025, 8:11 AM EDT
Boosters Separation
Separation of the side boosters
T+3:05Sep 25, 2025, 8:12 AM EDT
Fairing Separation
Separation of the payload fairing
T+4:23Sep 25, 2025, 8:13 AM EDT
BECO
Booster Engine Cutoff
T+4:29Sep 25, 2025, 8:13 AM EDT
Stage 2 Separation
Separation of the second stage from the first
T+4:39Sep 25, 2025, 8:14 AM EDT
SES-1
First start of the second engine
T+17:33Sep 25, 2025, 8:27 AM EDT
SECO-1
First cut-off of the second engine
T+20:22Sep 25, 2025, 8:29 AM EDT
Payload Deployment Sequence Start
Start of the payload deployment sequence
T+35:12Sep 25, 2025, 8:44 AM EDT
Payload Deployment Sequence End
End of the payload deployment sequence.
T+54:15Sep 25, 2025, 9:03 AM EDT
SES-2
Second start of the second engine
T+54:26Sep 25, 2025, 9:03 AM EDT
SECO-2
Second cut-off of the second engine
T+1:09:01Sep 25, 2025, 9:18 AM EDT
Mission End
End of the launch vehicle's mission

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Loading stages and recovery...

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Atlas V 551 launches across time.

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Launch news

Linked via Spaceflight News API (SNAPI).

2 items

Article

Spaceflight NowSep 25, 2025

Live coverage: ULA to launch fifth batch of Amazon’s Project Kuiper satellites from Cape Canaveral

This is the third time that United Launch Alliance will launch these broadband satellites, but it’s the fifth batch heading to orbit overall for the constell...

By Will Robinson-Smith

Article

NASASpaceflightSep 22, 2025

Launch Roundup: Kuiper, Starlink, IMAP headline launch manifest

A busy slate of launches is planned for the last full week of September, including… The post Launch Roundup: Kuiper, Starlink, IMAP headline launch manifest...

By Justin Davenport

Launch info

Provider

United Launch Alliance

Vehicle

Atlas V 551

Pad

Space Launch Complex 41 (SLC-41)

State

NET

2025-09-25T12:09:30+00:00

Window start

2025-09-25T12:09:00+00:00

Window end

2025-09-25T12:38:00+00:00

Orbit

Low Earth Orbit

Mission type

Communications

Launch site

Cape Canaveral SFS, FL, USA

Reusable

LEO capacity (kg)

18850

GTO capacity (kg)

8890

Pad satellite view

Open the launch pad in Google Maps satellite mode using the pad coordinates.

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Satellite preview

Space Launch Complex 41

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Cape Canaveral SFS, FL, USA • FL28.58341, -80.58304Provider map

Amazon Leo (KA-03)

Rocket

Atlas V 551

Manufacturer: United Launch Alliance

Atlas V is an expendable launch system in the Atlas rocket family. It was formerly operated by Lockheed Martin and is now operated by United Launch Alliance (ULA), a joint venture with Boeing. Each Atlas V rocket uses a Russian-built RD-180 engine burning kerosene and liquid oxygen to power its first stage and an American-built RL10 engine burning liquid hydrogen and liquid oxygen to power its Centaur upper stage. The RD-180 engines are provided by RD Amross, while Aerojet Rocketdyne provides both the RL10 engines and the strap-on boosters used in some configurations. The standard payload fairing sizes are 4 or 5 meters in diameter and of various lengths. Fairings sizes as large as 7.2 m in diameter and up to 32.3 m in length have been considered. The rocket is assembled in Decatur, Alabama and Harlingen, Texas.

Maiden flight

2006-01-19

Launch mass (t)

573

Launch cost

153000000

Vehicle wiki

Links & sources

Watch coverageLive/Replay Trajectory (FlightClub)Trajectory Pad satellite mapSatellite Rocket wikiReference Atlas V Kuiper 3www.ulalaunch.com Rocket Launch: Atlas V Kuiper 3Official Webcast Watch live: ULA Atlas 5 launches 27 Kuiper satellites for Amazon on Atlas 5 rocketUnofficial Webcast ULA Atlas V Launches Project Kuiper (KA-03)Unofficial Webcast

Service provider

United Launch Alliance

Provider news

Commercial • USA

United Launch Alliance (ULA) is a joint venture of Lockheed Martin Space Systems and Boeing Defense, Space & Security. ULA was formed in December 2006 by combining the teams at these companies which provide spacecraft launch services to the government of the United States. ULA launches from both coasts of the US. They launch their Atlas V vehicle from LC-41 in Cape Canaveral and LC-3E at Vandeberg. Their Delta IV launches from LC-37 at Cape Canaveral and LC-6 at Vandenberg.

Programs

Amazon Leo
Communication Constellation
Amazon Leo is a satellite internet constellation aimed at providing high-speed, low-latency broadband connectivity to underserved and remote areas globally. The project involves deploying a constellation of low Earth orbit (LEO) satellites to create a satellite internet network capable of delivering reliable internet access.
Program info Program wiki

Objects from this launch

27 objects

SATCAT inventory for 2025-217

Last checked: 2026-03-07T12:11:00.604+00:00

Last success: 2026-03-07T12:11:00.604+00:00

Last non-empty: 2026-03-07T12:11:00.604+00:00

Latest snapshot: 2026-03-07T12:11:00.604+00:00

Snapshot hash: bb34baef5d94fed10e98c5d6ea47c181fafcd0927e1ae07b56852180611b4083

LL2 payloads: 0SATCAT payloads: 27Delta: +27RB: 0DEB: 0UNK: 0

SATCAT payload objects

KUIPER-00120
2025-217ANORAD 65762PAYUnited States (US)Ops: +
Technical details
Orbit type: ORBOrbit center: EALaunch site: AFETRPeriod: 97.30 minOrbit source: gpEpoch: 2026-03-08T09:20:35.704032+00:00Orbit fetched: 2026-03-08T18:11:00.437+00:00
Inc: 51.9°
629 km → 630 km
Epoch: 2026-03-08T09:20:35.704032+00:00
KUIPER-00173
2025-217AANORAD 65786PAYUnited States (US)Ops: +
Technical details
Orbit type: ORBOrbit center: EALaunch site: AFETRPeriod: 97.21 minOrbit source: gpEpoch: 2026-03-08T22:00:01.999584+00:00Orbit fetched: 2026-03-09T06:11:00.551+00:00
Inc: 51.9°
624 km → 626 km
Epoch: 2026-03-08T22:00:01.999584+00:00
KUIPER-00174
2025-217ABNORAD 65787PAYUnited States (US)Ops: +
Technical details
Orbit type: ORBOrbit center: EALaunch site: AFETRPeriod: 97.30 minOrbit source: gpEpoch: 2026-03-08T08:22:13.817856+00:00Orbit fetched: 2026-03-09T06:11:00.551+00:00
Inc: 51.9°
629 km → 630 km
Epoch: 2026-03-08T08:22:13.817856+00:00
KUIPER-00176
2025-217ACNORAD 65788PAYUnited States (US)Ops: +
Technical details
Orbit type: ORBOrbit center: EALaunch site: AFETRPeriod: 97.30 minOrbit source: gpEpoch: 2026-03-08T16:04:57.606816+00:00Orbit fetched: 2026-03-09T06:11:00.551+00:00
Inc: 51.9°
629 km → 630 km
Epoch: 2026-03-08T16:04:57.606816+00:00
KUIPER-00132
2025-217BNORAD 65763PAYUnited States (US)Ops: +
Technical details
Orbit type: ORBOrbit center: EALaunch site: AFETRPeriod: 93.53 minOrbit source: gpEpoch: 2026-03-08T20:08:49.083936+00:00Orbit fetched: 2026-03-09T06:11:00.551+00:00
Inc: 51.9°
443 km → 451 km
Epoch: 2026-03-08T20:08:49.083936+00:00
KUIPER-00133
2025-217CNORAD 65764PAYUnited States (US)Ops: +
Technical details
Orbit type: ORBOrbit center: EALaunch site: AFETRPeriod: 97.30 minOrbit source: gpEpoch: 2026-03-08T16:38:10.952448+00:00Orbit fetched: 2026-03-09T06:11:00.551+00:00
Inc: 51.9°
628 km → 631 km
Epoch: 2026-03-08T16:38:10.952448+00:00
KUIPER-00139
2025-217DNORAD 65765PAYUnited States (US)Ops: +
Technical details
Orbit type: ORBOrbit center: EALaunch site: AFETRPeriod: 95.88 minOrbit source: gpEpoch: 2026-03-08T04:17:05.219232+00:00Orbit fetched: 2026-03-08T18:11:00.437+00:00
Inc: 51.9°
556 km → 566 km
Epoch: 2026-03-08T04:17:05.219232+00:00
KUIPER-00142
2025-217ENORAD 65766PAYUnited States (US)Ops: +
Technical details
Orbit type: ORBOrbit center: EALaunch site: AFETRPeriod: 97.30 minOrbit source: gpEpoch: 2026-03-08T14:39:39.345984+00:00Orbit fetched: 2026-03-09T06:11:00.551+00:00
Inc: 51.9°
629 km → 630 km
Epoch: 2026-03-08T14:39:39.345984+00:00
KUIPER-00145
2025-217FNORAD 65767PAYUnited States (US)Ops: +
Technical details
Orbit type: ORBOrbit center: EALaunch site: AFETRPeriod: 97.30 minOrbit source: gpEpoch: 2026-03-08T08:06:36.990432+00:00Orbit fetched: 2026-03-08T18:11:00.437+00:00
Inc: 51.9°
629 km → 630 km
Epoch: 2026-03-08T08:06:36.990432+00:00
KUIPER-00147
2025-217GNORAD 65768PAYUnited States (US)Ops: +
Technical details
Orbit type: ORBOrbit center: EALaunch site: AFETRPeriod: 97.30 minOrbit source: gpEpoch: 2026-03-08T07:14:12.02784+00:00Orbit fetched: 2026-03-08T18:11:00.437+00:00
Inc: 51.9°
629 km → 630 km
Epoch: 2026-03-08T07:14:12.02784+00:00
KUIPER-00148
2025-217HNORAD 65769PAYUnited States (US)Ops: +
Technical details
Orbit type: ORBOrbit center: EALaunch site: AFETRPeriod: 95.39 minOrbit source: gpEpoch: 2026-03-08T14:42:58.472064+00:00Orbit fetched: 2026-03-09T06:11:00.551+00:00
Inc: 51.9°
532 km → 543 km
Epoch: 2026-03-08T14:42:58.472064+00:00
KUIPER-00150
2025-217JNORAD 65770PAYUnited States (US)Ops: +
Technical details
Orbit type: ORBOrbit center: EALaunch site: AFETRPeriod: 97.30 minOrbit source: gpEpoch: 2026-03-08T05:20:56.441472+00:00Orbit fetched: 2026-03-08T18:11:00.437+00:00
Inc: 51.9°
629 km → 630 km
Epoch: 2026-03-08T05:20:56.441472+00:00
KUIPER-00151
2025-217KNORAD 65771PAYUnited States (US)Ops: +
Technical details
Orbit type: ORBOrbit center: EALaunch site: AFETRPeriod: 97.30 minOrbit source: gpEpoch: 2026-03-08T23:22:49.368864+00:00Orbit fetched: 2026-03-09T06:11:00.551+00:00
Inc: 51.9°
629 km → 630 km
Epoch: 2026-03-08T23:22:49.368864+00:00
KUIPER-00152
2025-217LNORAD 65772PAYUnited States (US)Ops: +
Technical details
Orbit type: ORBOrbit center: EALaunch site: AFETRPeriod: 97.30 minOrbit source: gpEpoch: 2026-03-08T21:16:20.878464+00:00Orbit fetched: 2026-03-09T06:11:00.551+00:00
Inc: 51.9°
629 km → 630 km
Epoch: 2026-03-08T21:16:20.878464+00:00
KUIPER-00153
2025-217MNORAD 65773PAYUnited States (US)Ops: +
Technical details
Orbit type: ORBOrbit center: EALaunch site: AFETRPeriod: 95.16 minOrbit source: gpEpoch: 2026-03-08T22:00:01.999584+00:00Orbit fetched: 2026-03-09T06:11:00.551+00:00
Inc: 51.9°
519 km → 534 km
Epoch: 2026-03-08T22:00:01.999584+00:00
KUIPER-00155
2025-217NNORAD 65774PAYUnited States (US)Ops: +
Technical details
Orbit type: ORBOrbit center: EALaunch site: AFETRPeriod: 94.55 minOrbit source: gpEpoch: 2026-03-08T06:53:16.79136+00:00Orbit fetched: 2026-03-08T18:11:00.437+00:00
Inc: 51.9°
493 km → 501 km
Epoch: 2026-03-08T06:53:16.79136+00:00
KUIPER-00156
2025-217PNORAD 65775PAYUnited States (US)Ops: +
Technical details
Orbit type: ORBOrbit center: EALaunch site: AFETRPeriod: 97.30 minOrbit source: gpEpoch: 2026-03-08T22:12:41.43312+00:00Orbit fetched: 2026-03-09T06:11:00.551+00:00
Inc: 51.9°
629 km → 630 km
Epoch: 2026-03-08T22:12:41.43312+00:00
KUIPER-00158
2025-217QNORAD 65776PAYUnited States (US)Ops: +
Technical details
Orbit type: ORBOrbit center: EALaunch site: AFETRPeriod: 97.26 minOrbit source: gpEpoch: 2026-03-08T06:03:09.648+00:00Orbit fetched: 2026-03-09T06:11:00.551+00:00
Inc: 51.9°
627 km → 629 km
Epoch: 2026-03-08T06:03:09.648+00:00
KUIPER-00163
2025-217RNORAD 65777PAYUnited States (US)Ops: +
Technical details
Orbit type: ORBOrbit center: EALaunch site: AFETRPeriod: 96.15 minOrbit source: gpEpoch: 2026-03-08T22:00:01.999584+00:00Orbit fetched: 2026-03-09T06:11:00.551+00:00
Inc: 51.9°
573 km → 576 km
Epoch: 2026-03-08T22:00:01.999584+00:00
KUIPER-00165
2025-217SNORAD 65778PAYUnited States (US)Ops: +
Technical details
Orbit type: ORBOrbit center: EALaunch site: AFETRPeriod: 97.30 minOrbit source: gpEpoch: 2026-03-08T15:28:12.080928+00:00Orbit fetched: 2026-03-09T06:11:00.551+00:00
Inc: 51.9°
629 km → 630 km
Epoch: 2026-03-08T15:28:12.080928+00:00
KUIPER-00166
2025-217TNORAD 65779PAYUnited States (US)Ops: +
Technical details
Orbit type: ORBOrbit center: EALaunch site: AFETRPeriod: 97.30 minOrbit source: gpEpoch: 2026-03-08T21:27:59.779296+00:00Orbit fetched: 2026-03-09T06:11:00.551+00:00
Inc: 51.9°
629 km → 630 km
Epoch: 2026-03-08T21:27:59.779296+00:00
KUIPER-00167
2025-217UNORAD 65780PAYUnited States (US)Ops: +
Technical details
Orbit type: ORBOrbit center: EALaunch site: AFETRPeriod: 97.30 minOrbit source: gpEpoch: 2026-03-08T23:18:53.332704+00:00Orbit fetched: 2026-03-09T06:11:00.551+00:00
Inc: 51.9°
629 km → 630 km
Epoch: 2026-03-08T23:18:53.332704+00:00
KUIPER-00168
2025-217VNORAD 65781PAYUnited States (US)Ops: +
Technical details
Orbit type: ORBOrbit center: EALaunch site: AFETRPeriod: 97.30 minOrbit source: gpEpoch: 2026-03-08T20:31:34.136544+00:00Orbit fetched: 2026-03-09T06:11:00.551+00:00
Inc: 51.9°
629 km → 630 km
Epoch: 2026-03-08T20:31:34.136544+00:00
KUIPER-00169
2025-217WNORAD 65782PAYUnited States (US)Ops: +
Technical details
Orbit type: ORBOrbit center: EALaunch site: AFETRPeriod: 97.31 minOrbit source: gpEpoch: 2026-03-08T07:27:09.552672+00:00Orbit fetched: 2026-03-09T06:11:00.551+00:00
Inc: 51.9°
629 km → 630 km
Epoch: 2026-03-08T07:27:09.552672+00:00
KUIPER-00170
2025-217XNORAD 65783PAYUnited States (US)Ops: +
Technical details
Orbit type: ORBOrbit center: EALaunch site: AFETRPeriod: 97.30 minOrbit source: gpEpoch: 2026-03-08T15:23:49.36704+00:00Orbit fetched: 2026-03-09T06:11:00.551+00:00
Inc: 51.9°
629 km → 630 km
Epoch: 2026-03-08T15:23:49.36704+00:00
KUIPER-00171
2025-217YNORAD 65784PAYUnited States (US)Ops: D
Technical details
Orbit type: IMPOrbit center: EALaunch site: AFETRPeriod: 87.83 minOrbit source: gpEpoch: 2026-02-08T01:42:48.205728+00:00Orbit fetched: 2026-02-08T09:00:05.524+00:00
Inc: 51.8°
165 km → 169 km
Epoch: 2026-02-08T01:42:48.205728+00:00
KUIPER-00172
2025-217ZNORAD 65785PAYUnited States (US)Ops: +
Technical details
Orbit type: ORBOrbit center: EALaunch site: AFETRPeriod: 96.98 minOrbit source: gpEpoch: 2026-03-08T22:00:01.999584+00:00Orbit fetched: 2026-03-09T06:11:00.551+00:00
Inc: 51.9°
612 km → 616 km
Epoch: 2026-03-08T22:00:01.999584+00:00

Mission agencies

Amazon LeoPrivate

Launch story

Mission stats

Provider, rocket, pad, and booster history tied to this launch.

2026 snapshot

Provider legacy

United Launch Alliance

168

Lifetime launches

4 in 2026

United Launch Alliance has 168 launches on record, with 4 in 2026.

Rocket track record

Atlas V 551

Successful missions

0 in 2026

Atlas V 551 has 19 successful missions on record, with 0 in 2026.

Pad history

Space Launch Complex 41

118

Pad launches

4 in 2026

Space Launch Complex 41 has 118 launches from this pad on record, with 4 in 2026.

Rocket reliability

100% all time

2026: no completed missions yet

Pad turnaround

43d 11h

Reported pad reuse cadence.