Atlas V 551 | Amazon Leo LA-05 | 04.04.2026

[Orionid]

5. start ULA z satelitami konstelacji Amazon Leo pierwotnie był zaplanowany na 30.03.2026 z LC-41.

The fifth launch of the United Launch Alliance (ULA) Atlas V 551 rocket carrying the next batch of production satellites for Amazon Leo, Leo 5, is planned for March 30, 2026, pending range approval. http://bit.ly/av_leo5

https://twitter.com/ulalaunch/status/2031747757950533674

ULA @ulalaunch 7:22 PM · Mar 16, 2026
Processing continues at Cape Canaveral where the Atlas V rocket team is preparing for its fifth @AmazonLeo
 mission. The rocket has completed initial buildup and will undergo system checkout before the payload is attached. Liftoff is targeted for March 30 at 3:31 a.m. EDT (0731 UTC). 
Follow mission progress: http://bit.ly/av_leo5
Photos: https://flic.kr/s/aHBqjCMTC9

https://x.com/ulalaunch/status/2033609796209820006

[Orionid]

Z powodu dostępności startu z wyrzutni data startu została przyspieszona

ULA @ulalaunch 4:02 PM · Mar 18, 2026
Due to range availability, the fifth launch of the United Launch Alliance (ULA) Atlas V 551 rocket carrying the next batch of production satellites for Amazon Leo, Leo 5, is planned for March 29, 2026, pending range approval. The 29-minute launch window opens at 3:53 a.m. EDT and will launch from Space Launch Complex-41 at Cape Canaveral Space Force Station, Florida.
@AmazonLeo // http://bit.ly/av_leo5

https://x.com/ulalaunch/status/2034284281590120612

[Orionid]

Górny stopień Centaur został zintegrowany z RN Atlas V

Amazon Leo @Amazonleo 4:31 PM · Mar 18, 2026
Launch update: @ulalaunch is now targeting Sunday, March 29 at 3:53 a.m. EDT for our Leo Atlas V (LA-05) mission.
At the Cape, ULA technicians have stacked the Centaur upper stage atop Atlas V as rocket preparation continues. Teams are moving through system testing ahead of integration with our payload.
Click here for more on upcoming and completed Leo missions: https://spr.ly/6018B6ppjo

https://x.com/Amazonleo/status/2034291670586388760

2)  Satelity Amazon Leo 5 zostały przeniesione do Vertical Integration Facility i umieszczone na szczycie Atlasa V.

ULA @ulalaunch 7:46 PM · Mar 21, 2026
ULA technicians transported the Amazon Leo 5 payload to the Vertical Integration Facility and hoisted the encapsulated satellites atop the Atlas V today. This will be the fifth Atlas V launch that enables expansion of the Amazon broadband constellation. Liftoff is scheduled for Sunday, March 29 at 3:53 a.m. EDT (0753 UTC).
http://bit.ly/av_leo5 // @AmazonLeo

https://x.com/ulalaunch/status/2035427839898534331

Amazon Leo @Amazonleo 6:28 PM · Mar 22, 2026
📸 A look behind the scenes as our LA-05 payload was integrated with Atlas V ahead of launch, targeting Sunday, March 29 at 3:53 a.m. EDT.
More: https://spr.ly/6016B6ZYsg

https://x.com/Amazonleo/status/2035770639651307790

ULA @ulalaunch 7:01 PM · Mar 23, 2026
ICYMI: On Saturday, United Launch Alliance hoisted the @AmazonLeo payload atop the Atlas V to begin combined operations between the rocket and 29 commercial satellites. The Atlas V plans to launch the Leo 5 mission for Amazon's broadband satellite constellation on Sunday, March 29.
Photos: https://flic.kr/s/aHBqjCMTC9
Launch info: http://bit.ly/av_leo5

https://x.com/ulalaunch/status/2036141196259606790

ULA @ulalaunch 5:01 PM · Mar 24, 2026
Atlas V Amazon Leo 5 // Preview
A delicate balance of brute force and precision is needed when launching an 18-ton payload into orbit for the @AmazonLeo broadband constellation. That is what the Atlas V 551 rocket will deliver when it performs the Amazon Leo 5 mission on Sunday. Watch a preview video of what you can expect.
http://bit.ly/av_leo5

https://twitter.com/ulalaunch/status/2036473607774200205

[Orionid]

ULA@ulalaunch 6:33 PM · Mar 25, 2026
🎥 Preparing Atlas V for Amazon Leo 5
Learn about the process ULA follows to prepare the 20-story-tall, 1.3-million-pound Atlas V 551 rocket to carry 29 broadband satellites into low Earth orbit to help expand the @AmazonLeo constellation. Launch is planned for Sunday.
http://bit.ly/av_leo5

https://twitter.com/ulalaunch/status/2036859123396993239

2) Przegląd Gotowości Startowej ULA (Launch Readiness Review)

ULA @ulalaunch 2:40 PM · Mar 26, 2026
The ULA Launch Readiness Review is GO to continue preps for launch of Atlas V with our fifth Amazon Leo constellation mission. Liftoff is planned for Sunday, at 3:53 a.m. EDT (0753 UTC) from Cape Canaveral, pending final range approval.

The predawn launch will be visible from Florida to New England, if weather conditions in your area permit. This visibility map shows when and where your best chances are to see the rocket as it streaks northeasterly into space.

ULA will offer live reports from launch control in our automatically refreshing blog beginning at 1 a.m. EDT (0500 UTC). The launch livestream starts at 20 minutes before liftoff.

http://bit.ly/av_leo5 //  @AmazonLeo

https://x.com/ulalaunch/status/2037162821750837528

3) Przygotowania do rolloutu

ULA @ulalaunch 3:22 PM · Mar 27, 2026
Rollout is underway of the United Launch Alliance Atlas V rocket to send the next batch of @AmazonLeo broadband satellites into space.
The MLP will travel to the pad with the help of undercarriage railcars and trackmobile machines that push the entire 1.9-million-pound (862,000kg) platform and Atlas V 551 rocket along tracks up the hill to the pad.
http://bit.ly/av_leo5

https://x.com/ulalaunch/status/2037535846748901858

4)

ULA @ulalaunch 4:58 PM · Mar 27, 2026
United Launch Alliance announces the arrival of our Atlas V rocket at its Cape Canaveral pad to launch Amazon Leo 5, currently planned for Sunday at 3:53 a.m. EDT (0753 UTC).

ULA will deliver 29 satellites into orbit for this fifth Amazon Leo mission, marking the largest and heaviest payload ever for the venerable rocket. Previous launches last year carried 27 spacecraft each.

The increase is a result of detailed work between ULA and Amazon, and is made possible by an extensive engineering and safety analysis that capitalized on the additional performance margin, adding a fourth level to the previous three-tier dispenser configuration for Atlas V.
http://bit.ly/av_leo5 //  @AmazonLeo

https://twitter.com/ulalaunch/status/2037559848460603667

5)

ULA @ulalaunch 8:54 PM · Mar 27, 2026
📸 Photo album from today's rollout of the Atlas V 551 rocket for @AmazonLeo.
 https://flic.kr/s/aHBqjCMTC9

https://x.com/ulalaunch/status/2037619312823804285

[Orionid]

Z powodu przewidywanych niekorzystnych warunków atmosferycznych start został przełożony

ULA @ulalaunch 4:14 PM · Mar 28, 2026
Due to predicted inclement weather, the fifth launch of the United Launch Alliance (ULA) Atlas V 551 rocket carrying the next batch of production satellites for Amazon Leo, Leo 5, has been delayed. The launch vehicle and spacecraft are healthy. A new launch date will be provided upon finalization of range approvals and deconfliction with the NASA Artemis II launch.
http://bit.ly/av_leo5 //  @AmazonLeo

https://x.com/ulalaunch/status/2037911210490798243

2) Nową datę startu wyznaczono na 04.04.2026 (okno startowe 07:45-08:14 CEST)

ULA @ulalaunch 6:15 PM · Apr 2, 2026
The fifth launch of the United Launch Alliance (ULA) Atlas V 551 rocket carrying the next batch of production satellites for Amazon Leo, Leo 5, is now planned for Saturday, April 4. The 29-minute launch window opens at 1:45 a.m. EDT and will launch from Space Launch Complex-41 at Cape Canaveral Space Force Station, Florida.
http://bit.ly/av_leo5 // @AmazonLeo

https://x.com/ulalaunch/status/2039738472433365376

[Orionid]

Amazon Leo @Amazonleo 12:03 AM · Apr 4, 2026
Atlas V is on the pad and ready for a late-night launch.
Leo Atlas 5 (LA-05) is set to lift off at 1:45 a.m. ET with 29 Amazon Leo satellites on board — our largest Atlas V payload to date, and the first of four back-to-back Atlas missions with @ulalaunch.
Livestream here: https://spr.ly/6014B6qVbj

https://twitter.com/Amazonleo/status/2040188453367783746

2) United Launch Alliance rozpoczęło odliczanie do startu.

ULA @ulalaunch Last edited 12:31 AM · Apr 4, 2026
United Launch Alliance has initiated the countdown for launch of the Atlas V rocket to deploy 29 advanced broadband satellites into space for Amazon Leo. Our overnight launch opportunity opens at exactly 1:45:30 a.m. EDT (0545:30 UTC) for liftoff from Cape Canaveral Space Force Station in Florida.

The launch countdown is a tightly scripted sequence of procedures and steps over the next seven hours that will complete pre-launch testing, fill the rocket with propellants and put systems into flight mode.

Our live status blog begins at  p.m. EDT (0245 UTC) just prior to the start of fueling operations and the livestream starts 20 minutes before launch.

http://bit.ly/av_leo5 //  @Amazonleo

https://twitter.com/ulalaunch/status/2040195424527511830

3)

ULA @ulalaunch 4:45 AM · Apr 4, 2026
Good evening from Atlas V launch control at Cape Canaveral where our live blog has started for tonight's Amazon Leo 5 mission. This is your official source for updates throughout the countdown to the 1:45 a.m. EDT (0545 UTC) launch.

We are on schedule to launch an Atlas V 551 rocket carrying the Amazon Leo 5 broadband satellite mission to low Earth orbit tonight. The payload consists of 29 spacecraft, the largest configuration for Atlas Leo.

And a head's up for spectators along the U.S. East Coast, this is your chance to witness a rocket heading into space!

http://bit.ly/av_leo5 //  @AmazonLeo

https://x.com/ulalaunch/status/2040259497982058762

4) Tankowanie Atlasa V paliwem kriogenicznym.
Prognoza pogody wskazuje na 90% szans na start.

ULA @ulalaunch 5:29 AM · Apr 4, 2026
Atlas V fueling is underway with cryogenic propellants for today's Amazon Leo 5 launch.

Atlas and Centaur propulsion console operators here at ULA's Launch Control Center are performing the steps to command the pad systems to begin flowing 66,000 gallons of liquid oxygen and liquid hydrogen in the rocket over the next 90 minutes.

Weather forecast is 90% favorable to launch at 1:45 a.m. EDT (0545 UTC). http://bit.ly/av_leo5 //  @AmazonLeo

https://x.com/ulalaunch/status/2040270408075665577

[Orionid]

Atlas V jest w pełni zatankowany i skonfigurowany do dzisiejszej misji Amazon Leo 5.

ULA @ulalaunch 7:13 AM · Apr 4, 2026
Atlas V is fully fueled and configured for today's Amazon Leo 5 mission that will advance our customer's mission to provide fast, reliable internet to communities around the world.

Clocks are holding at T-minus 4 minutes for a 30-minute, 30-second planned built-in hold before final readiness polls and proceed toward our new launch time of 1:46 a.m. EDT (0546 UTC).
Live launch webcast is about to begin. Tune in! http://bit.ly/av_leo5

https://twitter.com/ulalaunch/status/2040296600866603434

2) Dyrektor startów Bryan Titus wydał ostateczne pozwolenie na start

ULA @ulalaunch 7:40 AM · Apr 4, 2026
GO for launch! The final readiness poll by Launch Conductor Scott Barney is complete and Launch Director Bryan Titus has given final permission to launch our fifth @AmazonLeo mission!
GO ATLAS! GO CENTAUR! GO AMAZON LEO!
Watch the live launch webcast here: http://bit.ly/av_leo5

https://x.com/ulalaunch/status/2040303367663001773

[Orionid]

Start

ULA @ulalaunch 7:46 AM · Apr 4, 2026
LIFTOFF of the United Launch Alliance Atlas V for @AmazonLeo, taking the rocket's largest and heaviest payload ever into space! And the vehicle has cleared the tower! http://bit.ly/av_leo5

https://x.com/ulalaunch/status/2040304894926602663

2) Potwierdzono odrzucenie boosterów na paliwo stałe.

ULA @ulalaunch 7:47 AM · Apr 4, 2026
Solid rocket booster burnout and jettison is confirmed. The five GEM 63s consumed a half-million pounds (227,000 kg) of propellant to augment the initial liftoff power of the Atlas V. The rocket now weighs half of what it did at liftoff less than two minutes ago. http://bit.ly/av_leo5

https://x.com/ulalaunch/status/2040305353120719129

3) Atlas V przekroczył linię Karmana, co umożliwiło odrzucenie osłony ładunku.

ULA @ulalaunch 7:49 AM · Apr 4, 2026
Atlas V has exited Earth's atmosphere and crossed the Karman line, allowing the payload fairing to be jettisoned. The rocket is over 115 miles downrange from the launch pad and traveling more than 7,000 mph. http://bit.ly/av_leo5

https://x.com/ulalaunch/status/2040305774367252584

4) Udany start Atlasa został potwierdzony, gdy rakieta przeleciała nad wybrzeżem Cape Hatteras w Karolinie Północnej na wysokości 225 kilometrów.
Górny stopień Centaur kontynuował wznoszenie, przyspieszając ładunek Amazon Leo na orbitę.
Pojazd waży teraz mniej niż siedem procent swojej masy startowej.

ULA @ulalaunch 7:51 AM · Apr 4, 2026
Successful Atlas staging is confirmed as the rocket passes off the coast of Cape Hatteras, North Carolina at an altitude of 140 miles. The Centaur upper stage continues the ascent by accelerating the Amazon Leo payload to orbit. The vehicle now weighs less than seven percent of its liftoff mass. http://bit.ly/av_leo5

https://x.com/ulalaunch/status/2040306137937928556

5) MECO (Main Engine Cut-Off).
Rakieta na LEO.

ULA @ulalaunch 8:04 AM · Apr 4, 2026
Main engine cutoff, or MECO, is confirmed for the Centaur upper stage. The Atlas V rocket has achieved its low Earth orbit with the Amazon Leo Atlas 5 mission. http://bit.ly/av_leo5

https://x.com/ulalaunch/status/2040309532648169668

[Orionid]

ULA @ulalaunch 8:25 AM · Apr 4, 2026
United Launch Alliance has successfully completed today's launch of the Amazon Leo 5 mission by the Atlas V rocket! All 29 advanced broadband satellites have been released into low Earth orbit, marking the largest payload ever launched by the venerable rocket family.

Atlas V has delivered a total of 139 Amazon spacecraft into orbit through six successful flights -- Protoflight and five launches for the Leo constellation.

Next up, Leo 6 with another 29 satellites, is planned for April 27.
http://bit.ly/av_leo5 // @AmazonLeo

https://twitter.com/ulalaunch/status/2040314737225859573

ULA @ulalaunch 6:34 PM · Apr 4, 2026
LIFTOFF of the United Launch Alliance Atlas V for @AmazonLeo, successfully taking the rocket's largest and heaviest payload ever into space!
Photo gallery: https://flic.kr/s/aHBqjCMTC9
Launch info: http://bit.ly/av_leo5

https://twitter.com/ulalaunch/status/2040468129143198094

[Orionid]

79//77/72/5-4)

1. start RN Atlas V 551 w 2026
1. start wykonany przez ULA w 2026.
5. start z satelitami operacyjnymi przeprowadzony przez ULA dla Amazona.
9. start dla konstelacji Amazon (1 - Ariane 6, 3 - Falcon 9).

Potwierdzono rozmieszczenie kolejnych 29 satelitów Leo.
Misja ta była największym i najcięższym ładunkiem wyniesionym na orbitę przez rakietę Atlas 5 do tej pory.
Poprzednie cztery misje Amazon Leo, wystrzelone rakietami Atlas 5, wynosiły po 27 satelitów.

Misja otrzymała nazwę Amazon Leo 5 (ULA) i Leo Atlas 5 (LA-05) (Amazon).
29 satelitów Amazon Leo zostało wypuszczonych około 21 minut po starcie.
Odbyło się 10 sekwencji rozmieszczania, które zakończyły się około 17 minut później.
Silnik RL10C-1-1 w górnym stopniu Centaur 3 został ponownie uruchomiony około 55 minut po starcie w celu zakończenia misji.

Kolejny start dla konstelacji Amazona
  04.04. o 05:46:00 z Cape Canaveral wystrzelona została RN Atlas-5/551, która wyniosła na orbitę 29 satelitów Amazon Leo (misja LA-05).
http://lk.astronautilus.pl/n260401.htm#05
https://forum.nasaspaceflight.com/index.php?topic=64450.0

Views from Space // Atlas V Amazon Leo 5

Amazon Leo @Amazonleo 9:01 AM · Apr 4, 2026
Deployment confirmed: Another 29 Leo satellites have been successfully deployed in low Earth orbit, making it the heaviest payload ever launched on Atlas V.
Thanks to @ulalaunch for a successful fifth mission together.

https://twitter.com/Amazonleo/status/2040323798730232176

ULA @ulalaunch 9:01 AM · Apr 4, 2026
United Launch Alliance advances @AmazonLeo constellation with successful Leo 5 launch. Atlas V precisely delivered 29 broadband satellites dedicated to connecting the world.
https://newsroom.ulalaunch.com/releases/united-launch-alliance-advances-amazon-leo-constellation-with-successful-leo-5-launch

https://x.com/ulalaunch/status/2040323936424964214

Jacqmans@1972 🇳🇱🇪🇺🇺🇦 @Jacqmans1972 8:24 AM · Apr 4, 2026
@ulalaunch  Atlas-V launch this morning as seen from Titusville, Florida. @Amazonleo mission 5 with an Atlas rocket.
📸 Me for @ROOM__Space

https://twitter.com/Jacqmans1972/status/2040314634519908625

ULA’s Atlas 5 rocket launches its heaviest payload ever with fifth Amazon Leo mission
April 3, 2026 Will Robinson-Smith


The United Launch Alliance (ULA) Atlas 5 rocket sits on Space Launch Complex 41 (SLC-41) at Cape Canaveral at sunset. This will be ULA’s fifth launch for the Amazon Leo broadband satellite constellation.

United Launch Alliance launched its latest Atlas 5 rocket, which carried a batch of 29 Amazon Leo satellites to low Earth orbit. The mission was the largest and heaviest payload carried to orbit by an Atlas 5 rocket to date, according to ULA.

The mission was called Amazon Leo 5 by ULA and Leo Atlas 5 (LA-05) by Amazon. This was the fifth launch of operational satellites by ULA and the ninth for the constellation, which included one flight by Arianespace’s Ariane 6 rocket and three flights on SpaceX Falcon 9 rockets.

Liftoff of LA-05 happened Saturday, April 4, at 1:46 a.m. EDT (0546 UTC). The rocket headed out on a north-easterly trajectory upon leaving the launch pad. U.S. Space Force meteorologists predicted a 90 percent chance of acceptable weather for the launch.

After completing its launch readiness review on March 26, the following morning, ULA began rolling out its 62.5-meter-tall (205 ft) rocket from its Vertical Integration Facility out to the pad at Space Launch Complex 41. The move began around 10 a.m. EDT (1400 UTC) and ULA reported a “hard down” at the pad at 11:16 a.m. EDT (1516 UTC).

However, with high winds forecast for the rocket’s original launch date of March 29, ULA was forced to push back the launch until the next available launch date at Cape Canaveral after NASA’s Artemis 2 launch.

The Atlas 5 rolled back to its hangar on Tuesday and returned to the pad Thursday.

The 29 Amazon Leo satellites were released starting about 21 minutes after liftoff. There were 10 deployment sequences, which ended about 17 minutes later. The RL10C-1-1 engine on the Centaur 3 upper stage then reignited about 55 minutes after liftoff for a disposal burn, which will end the mission.

The previous four missions for Amazon Leo launched on by Atlas 5 rockets carried 27 satellites each. ULA and Amazon Leo were able to increase the payload stack to 29 as “a result of detailed engineering work between ULA and Amazon,” according to ULA.

Amazon pointed to ULA’s use of the RL10C-1-1 engine on the rocket’s upper stage as a key reason why they were able to add two more satellites to the mission.

“While the engine has flown on previous missions, LA-05 marks the first time the program has completed the extensive engineering and safety analysis required to use it with our larger payload,” Amazon said in a blog post. “Our engineering teams capitalized on the additional performance margin, adding a fourth level to the previous three-tier dispenser configuration for Atlas 5.”
https://spaceflightnow.com/2026/04/03/live-coverage-ulas-atlas-5-rocket-to-launch-its-heaviest-payload-ever-with-next-amazon-leo-mission/

[Lion97]

Rakieta Atlas V 551 należąca do United Launch Alliance (ULA) wyniosła piątą misję Amazon Leo (LA-05) – 29 satelitów na niską orbitę okołoziemską (LEO) dla konstelacji Amazon, wcześniej znanej jako Projekt Kuiper, co czyni je najcięższym ładunkiem, jaki kiedykolwiek wystrzelono na pokładzie Atlasa V. Start, 4 kwietnia 2026 r. o godz. 05:46 UTC (01:46 EDT), z kompleksu startowego Space Launch Complex 41 (SLC-41) w Stacji Sił Kosmicznych Cape Canaveral na Florydzie.

Satelity Amazon Leo  wystrzelone dzisiaj zwiększą łączną ich liczbę do 243, a 238 z nich uznano za sprawne. To był 107 start rakiety Atlas V, 1 w tym roku oraz 77 próba startu orbitalnego w 2026.





https://twitter.com/ulalaunch/status/2040323936424964214