Atlas V 551
ActiveUnited Launch Alliance (ULA)
Jan. 19, 2006
Description
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.
Specifications
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Minimum Stage
1 -
Max Stage
2 -
Length
59.7 m -
Diameter
3.8 m -
Fairing Diameter
5.4 m -
Launch Mass
573.0 T -
Thrust
12269.0 kN -
Apogee (Sub-Orbital)
40000.0 km
Family
-
Name
Atlas V 551 -
Family
― -
Variant
551 -
Alias
― -
Full Name
Atlas V 551
Payload Capacity
-
Launch Cost
$153000000 -
Low Earth Orbit
18850.0 kg -
Geostationary Transfer
Orbit
8890.0 kg -
Direct Geostationary
3850.0 kg -
Sun-Synchronous Capacity
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United Launch Alliance
Commercial
Interim CEO: John Elbon
ULA 2006United 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.
Upcoming Spaceflights
Atlas V 551 | Amazon Leo (LA-08)
United Launch Alliance | United States of AmericaCape Canaveral SFS, FL, USA
TBD July, 2026
Status: To Be Determined
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.
Low Earth OrbitAtlas V 551 | Amazon Leo (LA-07)
United Launch Alliance | United States of AmericaCape Canaveral SFS, FL, USA
May 29, 2026, 11:53 p.m.
Status: Launch Successful
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.
Low Earth OrbitAtlas V 551 | Amazon Leo (LA-06)
United Launch Alliance | United States of AmericaCape Canaveral SFS, FL, USA
April 28, 2026, 12:53 a.m.
Status: Launch Successful
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.
Low Earth OrbitAtlas V 551 | Amazon Leo (LA-05)
United Launch Alliance | United States of AmericaCape Canaveral SFS, FL, USA
April 4, 2026, 5:46 a.m.
Status: Launch Successful
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.
Low Earth Orbit
Atlas V 551 | Amazon Leo (LA-04)
United Launch Alliance | United States of AmericaCape Canaveral SFS, FL, USA
Dec. 16, 2025, 8:28 a.m.
Status: Launch Successful
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. 27 satellites are carried on this launch.
Low Earth OrbitAtlas V 551 | ViaSat-3 F2 (ViaSat-3 EMEA)
United Launch Alliance | United States of AmericaCape Canaveral SFS, FL, USA
Nov. 14, 2025, 3:04 a.m.
Status: Launch Successful
Mission:
The ViaSat-3 is a series of three Ka-band satellites is expected to provide vastly superior capabilities in terms of service speed and flexibility for a satellite platform. Each ViaSat-3 class satellite is expected to deliver more than 1-Terabit per second of network capacity, and to leverage high levels of flexibility to dynamically direct capacity to where customers are located.
Geostationary Transfer Orbit
Atlas V 551 | Amazon Leo (KA-03)
United Launch Alliance | United States of AmericaCape Canaveral SFS, FL, USA
Sept. 25, 2025, 12:09 p.m.
Status: Launch Successful
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. 27 satellites are carried on this launch.
Low Earth OrbitAtlas V 551 | Amazon Leo (KA-02)
United Launch Alliance | United States of AmericaCape Canaveral SFS, FL, USA
June 23, 2025, 10:54 a.m.
Status: Launch Successful
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. 27 satellites are carried on this launch.
Low Earth OrbitLong March 2D
4 x SatNet test satellites
Launch Complex 3 (LC-3/LA-1) - Xichang Satellite Launch Center, People's Republic of ChinaOfficially described as "Satellite-Internet Technology Demonstration Satellites". Probably 4 test satellites for the Chinese state-owned LEO commu…
Falcon 9
Starlink Group 17-41
Space Launch Complex 4E - Vandenberg SFB, CA, USAA batch of 24 satellites for the Starlink mega-constellation - SpaceX's project for space-based Internet communication system.
Atlas V 551
Amazon Leo (LA-07)
Space Launch Complex 41 - Cape Canaveral SFS, FL, USAAmazon Leo, formerly known as Project Kuiper, is a mega constellation of satellites in Low Earth Orbit that will offer broadband internet access, thi…
Falcon 9
Starlink Group 10-53
Space Launch Complex 40 - Cape Canaveral SFS, FL, USAA batch of 29 satellites for the Starlink mega-constellation - SpaceX's project for space-based Internet communication system.
Long March 7A
TJSW-24
201 - Wenchang Space Launch Site, People's Republic of ChinaChinese classified satellite claimed to be for communication technology test purposes. Actual mission not known.
