UNITED LAUNCH ALLIANCE

Atlas V 551 | Amazon Leo (LA-05)

SUCCESSApr 4, 2026 at 05:46 UTCAtlas V 551 →
PADSpace Launch Complex 41
SITECape Canaveral SFS, FL, USA →
ORBITLow Earth Orbit
TYPECommunications
PROGRAMAmazon Leo

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.

MISSION
Amazon Leo (LA-05)
MISSION TYPE
Communications
TARGET ORBIT
Low Earth Orbit
PROGRAM
Amazon Leo
COUNTRY
USA
CONFIRMEDPrecision: Half-year
LAUNCH LIBRARY 2 PRIMARY
API ID: 8a9f7ce9-4ab5-4227-95f1-9f328def8828
Reported date: Apr 4, 2026 at 05:46 UTC
Last synced: 2 hours ago
This launch date and time are confirmed by the launch provider. Countdown is active.
SCHEDULE & STATUS HISTORY
STATUS CHANGEApr 4, 2026 at 15:48 UTC
PARTIALSUCCESS
Source: Launch Library 2
STATUS CHANGEApr 4, 2026 at 05:51 UTC
GOPARTIAL
Source: Launch Library 2
STATUS CHANGEApr 2, 2026 at 17:49 UTC
TBDGO
Source: Launch Library 2
DELAYED(4.2 days)
Mar 28, 2026 at 22:46 UTC
Mar 31, 2026 00:00Apr 4, 2026 05:45 UTC
Source: Launch Library 2
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MANUFACTURER
United Launch Alliance
VARIANT
551
FLIGHTS
20
SUCCESSES
20
SUCCESS RATE
100%

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.

When is the Atlas V 551 | Amazon Leo (LA-05) launch?
The Atlas V 551 | Amazon Leo (LA-05) is scheduled for Saturday, April 4, 2026 at 5:46 AM UTC. This is the NET (No Earlier Than) time and may be subject to change. Current status: SUCCESS.
What rocket is being used for Amazon Leo (LA-05)?
The Atlas V 551 | Amazon Leo (LA-05) mission uses the Atlas V 551 rocket, manufactured by United Launch Alliance. The Atlas V 551 has flown 20 times with a 100% success rate.
Where is the Atlas V 551 | Amazon Leo (LA-05) launching from?
The launch takes place from Space Launch Complex 41 at Cape Canaveral SFS, FL, USA.
What orbit is Amazon Leo (LA-05) going to?
The Amazon Leo (LA-05) mission is targeting Low Earth Orbit.
Who is launching Amazon Leo (LA-05)?
The Atlas V 551 | Amazon Leo (LA-05) is operated by United Launch Alliance. It is part of the Amazon Leo program.
Can I watch the Atlas V 551 | Amazon Leo (LA-05) launch live?
Yes. Visit the launch detail page on Space Launch Live for embedded YouTube webcasts, replay videos, and links to live coverage from SpaceX, NASA, NASASpaceflight, and other channels.
Apr 10, 2026 12:19 UTC
Launch completed successfully
Updated via Launch Library 2
Apr 4, 2026 15:48 UTC
Status changed: PARTIAL u2192 SUCCESS
Launch completed successfully (via Launch Library 2)
Apr 4, 2026 05:51 UTC
Status changed: GO u2192 PARTIAL
Launch partial success (via Launch Library 2)
Apr 2, 2026 17:49 UTC
Status changed: TBD u2192 GO
Launch GO for launch (via Launch Library 2)
Mar 28, 2026 22:46 UTC
Launch delayed by 4.2 days
Mar 31, 2026 00:00 UTC u2192 Apr 4, 2026 05:45 UTC (via Launch Library 2)
Mar 22, 2026 17:23 UTC
Launch added to tracker
Imported from Launch Library 2 API
Mar 22, 2026 17:23 UTC
Launch date set: Apr 4, 2026 at 05:46 UTC
NET (No Earlier Than) confirmed by United Launch Alliance
Last data sync: 2 hours ago
Launch Library 22 hours ago
Launch ID: 8a9f7ce9-4ab5-4227-95f1-9f328def8828
Open-Meteo Weather2 hours ago
Pad weather at 28.58, -80.58
YouTube Video Search2 months ago
3 videos discovered
X (Twitter) Search2 hours ago
10 tweets
RECENT FROM X
@SpaceNowInfo ✓1 month ago
ud83dudea8 Update on mission Atlas V 551 | Amazon Leo (LA-05)nnCurrent status: Launch in FlightnnLiftoff.nhttps://t.co/FzIsOg7FoO
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@SpaceNowInfo ✓1 month ago
ud83dudea8 Update on mission Atlas V 551 | Amazon Leo (LA-05)nnCurrent status: Go for LaunchnnNew T-0.nhttps://t.co/7vSGvNxKRO
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@NextSFTest334 ✓1 month ago
One hour until the launch of Atlas V 551 | Amazon Leo (LA-05)nnCheck the Next Spaceflight app or website for more infonhttps://t.co/hrGqJ6D4d2
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@launchwatchapp ✓1 month ago
u23f1ufe0f T-MINUS 1 HOUR u2014 Atlas V 551 | Amazon Leo (LA-05)nud83dude80 Atlas V 551 | WEST COAST ud83cudf04nud83dudcc5 Sat, Apr 4, 1:45 AM EDTnud83cudfaf ud83dudfe2 Go for launchnu2601ufe0f 90% weather gonLast chance to check your spot ud83dudc47nhttps://t.co/K876zOigk6 https
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@RocketLaunchOrg ✓1 month ago
ud83dude80 Atlas V 551 launch in T-1 hour! nud83cudff7ufe0f Amazon Leo (LA-05)nud83dudccd Cape Canaveral Space Force Stationnud83cudfaf Low Earth Orbit nn Find out more and watch livenhttps://t.co/TCrIXVS4ke
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