Rocket family · United Launch Alliance
Delta
Rockets
Overview
A prolific U.S. launch-vehicle family spanning six decades, from the Thor-derived Delta through the Delta II and the hydrogen-fueled Delta IV, retired in 2024.
Vehicles in this family
| Vehicle | Country | First flight | Lift class | LEO payload | Status |
|---|---|---|---|---|---|
| Delta II | United States | 1989 | Medium-lift | — | Retired |
| Delta IV Heavy | United States | 2004 | Heavy-lift | 28,800 kg | Retired |
Knowledge connections
- Operated byUnited Launch Alliance
- Family includesDelta II
- Family includesDelta IV Heavy
Sources
The primary and reference sources this topic draws on.
- ULAUnited Launch Alliance
Atlas V, Delta IV, and Vulcan Centaur — manufacturer specifications and mission data.