# Atlas V 551 | Amazon Leo (KA-01): launch

> Atlas V 551 by United Launch Alliance from Cape Canaveral SFS, FL, USA. Flown: Success.

- Canonical page: https://spacenexus.us/launch/cmtdf1dv300wuoqhxm98oownz
- This Markdown version: https://spacenexus.us/launch/cmtdf1dv300wuoqhxm98oownz.md
- Data as of: 2026-10-13 03:30 UTC (last Launch Library 2 sync)
- How the numbers are made: https://spacenexus.us/launch-slips/method

## Facts

- Launch: Atlas V 551 | Amazon Leo (KA-01)
- Mission: Amazon Leo (KA-01)
- Provider: United Launch Alliance
- Rocket: Atlas V 551
- Pad: Cape Canaveral SFS, FL, USA
- Country of the launch site: USA
- Date (UTC): Mon, Apr 28, 23:01 UTC (2025-04-28T23:01:00.000Z)
- Launch window: 2025-04-28 23:00 UTC to 2025-04-29 01:00 UTC
- Status: completed (Launch Library 2: Success)
- Outcome: Success
- Real slips recorded: 0; other date moves (placeholder rolls, firmings), not slips: 0

## Mission description

Quoted from Launch Library 2: 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.

## Date history

No date change recorded for this launch since our ledger began.

## Sources

- [Launch Library 2 by The Space Devs](https://thespacedevs.com): launch names, providers, rockets, pads, dates and status
- [SpaceNexus Launch Ledger (our own record of every date change)](https://spacenexus.us/launch-slips/method)
- [Mission information (link from Launch Library 2)](https://www.spacelaunchnow.me/launch/atlas-v-551-amazon-leo-ka-01)

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- Launch facts (names, providers, rockets, pads, dates, status): Launch Library 2 by The Space Devs (thespacedevs.com), credited and not relicensed by SpaceNexus.
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