Atlas V 551 | Amazon Leo (LA-04)
Launch Successful
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Launch Window
Dec. 16, 2025, 8:28 a.m. - Dec. 16, 2025, 8:57 a.m.
Dec. 16, 2025, 8:28 a.m. - Dec. 16, 2025, 8:57 a.m.
Watch live coverage of the launch of a United Launch Alliance Atlas 5 rocket with the third batch of 27 satellites for Amazon's Leo internet service on Tuesday, Dec. 16, 2025. Liftoff is scheduled during a 29-minute launch window that opens at 3:28 a.m. EST (0828 UTC). Amazon’s LEO satellite …
ULA Atlas V launch of the Amazon Leo Atlas 4 (LA-04) mission from SLC-41. Launch Window: December 16th from 3:28AM to 3:57AM EST (08:28-08:57 UTC) Current T0: December 16th at 3:49AM EST (08:28 UTC) Mission: Atlas V 551 launch of a batch of 27 Amazon Leo satellites Launch location: Space …
ULA's Atlas V rocket will deliver another batch of satellites into low Earth orbit for Amazon Leo, the broadband constellation. Its mission is to provide fast, reliable internet to customers around the world, including those in unserved and underserved communities, using a network of more than 3,000...
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. 27 satellites are carried on this launch.
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Launch success.
Liftoff
Official Webcast by United Launch Alliance has started
Updated launch weather.
Delayed to December 16 due to launch site ground winds.
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.
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.
INFO WIKI
From Space Launch Complex 41 at Cape Canaveral Space Force Station, Florida, a United Launch Alliance Atlas V leapt into
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This will be the sixth and final launch of the year for United Launch Alliance. Teams are targeting liftoff from pad 41 at Cape Canaveral Space Force Station at 3:49 a.m. EST (0849 UTC).
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