Amazon Leo (LA-04)
Atlas V 551
United Launch Alliance
Rocket Launch Videos
Weather Forecast During Launch
According to weather officials, there's a 90% chance of favorable weather conditions at the time of the launch. Officials are monitoring weather conditions with concerns related to Cumulus Cloud Rule.
Trajectory
View comprehensive details including the rocket's trajectory, velocity, altitude, thrust, and more at FlightClub.io.
Rocket Launch Timeline
Enhance your rocket launch experience with a detailed timeline! From pre-launch preparations to post-launch milestones, a well-structured schedule ensures every step—payload prep, safety checks, and liftoff—runs smoothly. Stay informed and follow the action with precision.
| T- 00 : 00 : 00 | Ignition Start of the engine ignition sequence |
| T+ 00 : 00 : 01 | Liftoff First upwards movement of the rocket |
| T+ 00 : 00 : 00 | Supersonic Vehicle is supersonic |
| T+ 00 : 00 : 00 | Max-Q Maximum dynamic pressure |
| T+ 00 : 01 : 00 | Boosters Separation Separation of the side boosters |
| T+ 00 : 03 : 00 | Fairing Separation Separation of the payload fairing |
| T+ 00 : 04 : 00 | BECO Booster Engine Cutoff |
| T+ 00 : 04 : 00 | Stage 2 Separation Separation of the second stage from the first |
| T+ 00 : 04 : 00 | SES-1 First start of the second engine |
| T+ 00 : 17 : 00 | SECO-1 First cut-off of the second engine |
| T+ 00 : 20 : 00 | Payload Deployment Sequence Start Start of the payload deployment sequence |
| T+ 00 : 35 : 00 | Payload Deployment Sequence End End of the payload deployment sequence. |
| T+ 00 : 54 : 00 | SES-2 Second start of the second engine |
| T+ 00 : 54 : 00 | SECO-2 Second cut-off of the second engine |
| T+ 01 : 09 : 00 | Mission End End of the launch vehicle's mission |
Mission
Amazon Leo (LA-04)
- Type: Communications
- Orbit: Low Earth Orbit
- Launch Cost: $153,000,000
Learn more about the Amazon Leo 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.
Location
Space Launch Complex 41
Cape Canaveral SFS, FL, USA
Find the best place to watch the launch from Florida
Space Launch Complex 41 has witnessed the launch of 121 rockets, including 121 orbital launch attempts. While Cape Canaveral SFS, FL, USA, has been the site for 1086 rocket launches.
Cape Canaveral Space Force Station (CCSFS) is an installation of the United States Space Force's Space Launch Delta 45, located on Cape Canaveral in Brevard County, Florida.
Rocket
United Launch Alliance Atlas V 551
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.
Agency
United Launch Alliance
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.
Frequently Asked Questions
When was the United Launch Alliance Atlas V 551 Amazon Leo (LA-04) launch scheduled?
The United Launch Alliance Atlas V 551 Amazon Leo (LA-04) launch was scheduled for:
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Where can I watch the United Launch Alliance Atlas V 551 Amazon Leo (LA-04) launch video?
You can watch the United Launch Alliance Atlas V 551 launch video on this page. The official video includes full mission coverage with multiple camera angles, onboard views, and expert commentary covering pre-launch procedures, liftoff, stage separation, and payload deployment.
Where did the United Launch Alliance Atlas V 551 Amazon Leo (LA-04) mission launch from?
The United Launch Alliance Atlas V 551 rocket launched from Space Launch Complex 41 at Cape Canaveral SFS, FL, USA. Cape Canaveral Space Force Station (CCSFS) is an installation of the United States Space Force's Space Launch Delta 45, located on Cape Canaveral in Brevard County, Florida.
What rocket was used for the Amazon Leo (LA-04) mission?
The Amazon Leo (LA-04) mission launched aboard a United Launch Alliance Atlas V 551 rocket. 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. Detailed rocket specifications and performance data are available in the rocket details above.
What weather conditions could have delayed the United Launch Alliance Atlas V 551 Amazon Leo (LA-04) launch?
The United Launch Alliance Atlas V 551 Amazon Leo (LA-04) launch could have been delayed by various weather conditions including lightning within 10 nautical miles, high winds (especially upper-level winds), thick cloud layers, precipitation, and poor visibility. Weather must be favorable at the launch site, downrange landing zones, and abort landing sites.
How can I get updates if the United Launch Alliance Atlas V 551 Amazon Leo (LA-04) launch was delayed?
This page was updated in real-time with the latest United Launch Alliance Atlas V 551 launch status, including any delays or scrubs for the Amazon Leo (LA-04) mission. You can also check our space launch schedule for historical launch information. Our mobile app provides push notifications for instant alerts about launch status changes. Official United Launch Alliance live streams provided the most immediate range updates during the launch window.
