United Launch Alliance

Amazon Leo (LA-05)

Success

Atlas V 551

T-minus to liftoff

-

00

HOURS

:

00

MINUTES

:

00

SECONDS

Saturday April 4 2026, 05:46:00 UTC

StatusSuccess

VehicleAtlas V 551

OrbitLow Earth Orbit

PadSpace Launch Complex 41

Loading map…

Mission

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.

Launch Timeline

Countdown

T-00:00:03

Ignition

In-flight

T+00:00:01

Liftoff

T+00:00:34

Supersonic

T+00:00:52

Max-Q

T+00:01:46

Boosters Separation

T+00:03:05

Fairing Separation

T+00:04:21

BECO

T+00:04:27

Stage 2 Separation

T+00:04:37

SES-1

T+00:18:21

SECO-1

T+00:21:10

Payload Deployment Sequence Start

T+00:37:41

Payload Deployment Sequence End

T+00:54:52

SES-2

T+00:55:02

SECO-2

Quick facts

VehicleAtlas V 551

OrbitLow Earth Orbit

PadSpace Launch Complex 41

SiteCape Canaveral SFS, FL, USA

WindowSaturday April 4 2026, 05:45:00 UTC→Saturday April 4 2026, 06:14:00 UTC

Vehicle

FamilyAtlas

Height59.7 m

Diameter3.8 m

Stages2

ReusableNo

LEO capacity18,850 kg

Track record23/23 successful

All launches

United Launch Alliance

Amazon Leo (LA-05)

Success

Atlas V 551

T-minus to liftoff

-

00

HOURS

:

00

MINUTES

:

00

SECONDS

Saturday April 4 2026, 05:46:00 UTC

StatusSuccess

Scrub riskHIGH

Go33%

VehicleAtlas V 551

OrbitLow Earth Orbit

PadSpace Launch Complex 41

Launch CodexDossier

Every source for this mission in one place — news, social, references, notes & the exact timeline.

Explore

Acquiring satellite view…

General trajectory

Space Launch Complex 41

Cape Canaveral SFS, FL, USA

Launching

Northeast

46° · NE

28.583, -80.583

Orbital elements (TLE)

Orbit

Apogee452 km

Perigee448 km

Period93.6 min

Inclination51.86°

Launch heading 46° · NE from Amazon Leo (LA-05).

OrbitAmazon Leo (LA-05)› conehigh

1 70059U 26072A 26094.25266204 .00000000 00000-0 00000-0 0 9996

2 70059 51.8600 174.9292 0003005 145.0813 298.1185 15.38655891 02

Pre-launch TLEs from Dillon's Space Page. Estimated before flight — the real orbit is confirmed post-launch.

Loading map…

Mission

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.

Q's read

Weather & scrubHIGH risk

Weather Go33%LL2 Go95%Wind2 m/sGusts4 m/sCloud23%Temp25°C

Limiting rule: No flight through cumulus cloud with top at or above the freezing level.

max cloud-top 5874 m above freezing 4544 m (97% cover in 10 nmi) · no GLM flashes within 25 nmi / 30 min, likely cirrus / stratiform ice rather than cumulus · max-top 5874 m, mean 5056 m, 97% cover, freezing 4544 m · METAR reports DISTANT lightning (beyond 10 SM, outside the LCC radius): "KCOF 270655Z AUTO 15004KT 10SM -DZ OVC150 26/23 A2996 RMK AO2 LTG DSNT SW-W RAE1"

Launch Timeline

Countdown

T-00:00:03

Ignition

In-flight

T+00:00:01

Liftoff

T+00:00:34

Supersonic

T+00:00:52

Max-Q

T+00:01:46

Boosters Separation

T+00:03:05

Fairing Separation

T+00:04:21

BECO

T+00:04:27

Stage 2 Separation

T+00:04:37

SES-1

T+00:18:21

SECO-1

T+00:21:10

Payload Deployment Sequence Start

T+00:37:41

Payload Deployment Sequence End

T+00:54:52

SES-2

T+00:55:02

SECO-2

Quick facts

VehicleAtlas V 551

OrbitLow Earth Orbit

PadSpace Launch Complex 41

SiteCape Canaveral SFS, FL, USA

WindowSaturday April 4 2026, 05:45:00 UTC→Saturday April 4 2026, 06:14:00 UTC

Vehicle

FamilyAtlas

Height59.7 m

Diameter3.8 m

Stages2

ReusableNo

LEO capacity18,850 kg

Track record23/23 successful

Launch CodexDossier

Every source for this mission in one place — news, social, references, notes & the exact timeline.

Explore

Acquiring satellite view…

General trajectory

Space Launch Complex 41

Cape Canaveral SFS, FL, USA

Launching

Northeast

46° · NE

28.583, -80.583

Orbital elements (TLE)

Orbit

Apogee452 km

Perigee448 km

Period93.6 min

Inclination51.86°

Launch heading 46° · NE from Amazon Leo (LA-05).

OrbitAmazon Leo (LA-05)› conehigh

1 70059U 26072A 26094.25266204 .00000000 00000-0 00000-0 0 9996

2 70059 51.8600 174.9292 0003005 145.0813 298.1185 15.38655891 02

Pre-launch TLEs from Dillon's Space Page. Estimated before flight — the real orbit is confirmed post-launch.

Scrub riskHIGH

Go33%

Q's read

Weather & scrubHIGH risk

Weather Go33%LL2 Go95%Wind2 m/sGusts4 m/sCloud23%Temp25°C

Limiting rule: No flight through cumulus cloud with top at or above the freezing level.

max cloud-top 5874 m above freezing 4544 m (97% cover in 10 nmi) · no GLM flashes within 25 nmi / 30 min, likely cirrus / stratiform ice rather than cumulus · max-top 5874 m, mean 5056 m, 97% cover, freezing 4544 m · METAR reports DISTANT lightning (beyond 10 SM, outside the LCC radius): "KCOF 270655Z AUTO 15004KT 10SM -DZ OVC150 26/23 A2996 RMK AO2 LTG DSNT SW-W RAE1"