Watch the Launch

Watch the Launch

Additional Media

Watch live: ULA Atlas 5 launches 27 Kuiper satellites for Amazon on Atlas 5 rocket

Watch live coverage of the launch of an Atlas 5 rocket with the third batch of 27 satellites for Amazon's Kuiper internet service on Thursday, Sept. 25, 2025. Liftoff is scheduled for 8:09 a.m. EDT (1...

ULA Atlas V Launches Project Kuiper (KA-03)

Project Kuiper is a mega constellation of satellites in Low Earth Orbit that will offer broadband internet access managed by Kuiper Systems LLC, a subsidiary of Amazon. This constellation is planned t...

Atlas V Kuiper 3

ULA's Atlas V rocket is delivering another batch of Project Kuiper satellites into space for Amazon. Project Kuiper is Amazon's low Earth orbit satellite broadband network. Its mission is to provide fast, reliable internet to customers around the world, including those in unserved and underserved co...

Amazon Leo (KA-03)

Overview

Destination: Low Earth Orbit
Mission: Communications

Low Earth Orbit Space Launch Complex 41 Cape Canaveral SFS, FL, USA Probability: 95%

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.

Telemetry

Launch trajectory and telemetry simulations provided by Flight Club - a rocket launch simulator and orbital trajectory visualiser for all things space!

Updates

Cosmic_Penguin • Sept. 25, 2025, 1:59 p.m.

Launch success.


Cosmic_Penguin • Sept. 25, 2025, 12:09 p.m.

Liftoff.


LL2 • Sept. 25, 2025, 11:49 a.m.

Official Webcast by United Launch Alliance has started


Cosmic_Penguin • Sept. 25, 2025, 9:29 a.m.

Tweaked T-0.


Cosmic_Penguin • Sept. 24, 2025, 6:04 p.m.

Updated launch weather, 95% GO.


Atlas V 551

Family:
Configuration: 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.

Specifications
  • 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
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

United Launch Alliance

United Launch Alliance

(ULA)

Interim CEO: John Elbon Founded: 2006 Successes: 175 Failures: 0 Pending: 36

Agency Type:

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
Spaceflight Now

Live coverage: ULA to launch fifth batch of Amazon’s Project Kuiper satellites from Cape Canaveral

This is the third time that United Launch Alliance will launch these broadband satellites, but it’s the fifth batch heading to orbit overall for the constellation. Liftoff is scheduled for 8:09 a.m. EDT (1230 UTC).

NASASpaceflight

Launch Roundup: Kuiper, Starlink, IMAP headline launch manifest

A busy slate of launches is planned for the last full week of September, including… The post Launch Roundup: Kuiper, Starlink, IMAP headline launch manifest appeared first on NASASpaceFlight.com.

Cape Canaveral SFS, FL, USA

Space Launch Complex 41


Falcon 9
Success
2 days, 4 hours ago
Starlink Group 17-49
Space Launch Complex 4E - Vandenberg SFB, CA, USA

A batch of 24 satellites for the Starlink mega-constellation - SpaceX's project for space-based Internet communication system.


Falcon 9
Success
2 days, 17 hours ago
Starlink Group 10-19
Space Launch Complex 40 - Cape Canaveral SFS, FL, USA

A batch of 29 satellites for the Starlink mega-constellation - SpaceX's project for space-based Internet communication system.


H3-22
Success
3 days, 13 hours ago
Michibiki 7 (QZS-7)
Yoshinobu Launch Complex LP-2 - Tanegashima Space Center, Japan

QZSS (Quasi Zenith Satellite System) is a Japanese satellite navigation system operating from inclined, elliptical geosynchronous orbits to achieve o…


Long March 7A
Failure
3 days, 20 hours ago
ChinaSat 4B
201 - Wenchang Space Launch Site, People's Republic of China

Chinese communication geostationary satellite for unknown purposes.


Falcon 9
Success
5 days, 16 hours ago
Starlink Group 17-38
Space Launch Complex 4E - Vandenberg SFB, CA, USA

A batch of 24 satellites for the Starlink mega-constellation - SpaceX's project for space-based Internet communication system.


Electron
Success
1 week ago
The Grain Goddess Provides (iQPS Launch 7)
Rocket Lab Launch Complex 1A - Rocket Lab Launch Complex 1, Mahia Peninsula, New Zealand

Synthetic aperture radar Earth observation satellite for Japanese Earth imaging company iQPS.


Falcon 9
Success
1 week, 2 days ago
BlueBird 11-13 (Block 2 #6-8)
Space Launch Complex 40 - Cape Canaveral SFS, FL, USA

AST SpaceMobile’s Block 2 BlueBird satellites are designed to deliver up to 10 times the bandwidth capacity of the BlueBird Block 1 satellites, requi…


Smart Dragon 3
Success
1 week, 2 days ago
OSE HS-01 & 02
Haiyang offshore launch location - Haiyang Oriental Spaceport

2 hyper-spectral Earth observation satellites from Chinese company STAR.VISION. Both satellites are built in corporation with foreign customers: *…


Falcon 9
Success
1 week, 2 days ago
Starlink Group 17-53
Space Launch Complex 4E - Vandenberg SFB, CA, USA

A batch of 24 satellites for the Starlink mega-constellation - SpaceX's project for space-based Internet communication system.


Long March 8A
Success
1 week, 3 days ago
SatNet LEO Group 23
Commercial LC-1 - Wenchang Space Launch Site, People's Republic of China

A batch of 9 Low Earth Orbit communication satellites for the Chinese state owned SatNet constellation operated by the China Satellite Network Group.…