UNITED LAUNCH ALLIANCE

Atlas V 551 | Amazon Leo (KA-01)

SUCCESSApr 28, 2025 at 23:01 UTCAtlas V 551 →
PADSpace Launch Complex 41
SITECape Canaveral SFS, FL, USA →
ORBITLow Earth Orbit
TYPECommunications
PROGRAMAmazon Leo

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.

MISSION
Amazon Leo (KA-01)
MISSION TYPE
Communications
TARGET ORBIT
Low Earth Orbit
PROGRAM
Amazon Leo
COUNTRY
USA
CONFIRMED
LAUNCH LIBRARY 2 PRIMARY
API ID: fac9159b-5960-464b-bc04-9879d30bb3cd
Reported date: Apr 28, 2025 at 23:01 UTC
Last synced: 4 minutes ago
This launch date and time are confirmed by the launch provider. Countdown is active.
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MANUFACTURER
United Launch Alliance
VARIANT
551
FLIGHTS
19
SUCCESSES
19
SUCCESS RATE
100%

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.

When is the Atlas V 551 | Amazon Leo (KA-01) launch?
The Atlas V 551 | Amazon Leo (KA-01) is scheduled for Monday, April 28, 2025 at 11:01 PM UTC. This is the NET (No Earlier Than) time and may be subject to change. Current status: SUCCESS.
What rocket is being used for Amazon Leo (KA-01)?
The Atlas V 551 | Amazon Leo (KA-01) mission uses the Atlas V 551 rocket, manufactured by United Launch Alliance. The Atlas V 551 has flown 19 times with a 100% success rate.
Where is the Atlas V 551 | Amazon Leo (KA-01) launching from?
The launch takes place from Space Launch Complex 41 at Cape Canaveral SFS, FL, USA.
What orbit is Amazon Leo (KA-01) going to?
The Amazon Leo (KA-01) mission is targeting Low Earth Orbit.
Who is launching Amazon Leo (KA-01)?
The Atlas V 551 | Amazon Leo (KA-01) is operated by United Launch Alliance. It is part of the Amazon Leo program.
Can I watch the Atlas V 551 | Amazon Leo (KA-01) launch live?
Yes. Visit the launch detail page on Space Launch Live for embedded YouTube webcasts, replay videos, and links to live coverage from SpaceX, NASA, NASASpaceflight, and other channels.
Mar 25, 2026 00:37 UTC
Launch added to tracker
Imported from Launch Library 2 API
Mar 25, 2026 00:37 UTC
Launch date set: Apr 28, 2025 at 23:01 UTC
NET (No Earlier Than) confirmed by United Launch Alliance
Mar 25, 2026 00:37 UTC
Launch completed successfully
Updated via Launch Library 2
Last data sync: 4 minutes ago
Launch Library 24 minutes ago
Launch ID: fac9159b-5960-464b-bc04-9879d30bb3cd
Open-Meteo Weather2 hours ago
Pad weather at 28.58, -80.58
YouTube Video Search2 weeks ago
3 videos discovered