Subscribe with SteadyUSA 554, 584
USA 554 is an experimental geostationary satellite built for the US Space Force to conduct technological experiments.
The USA 554 satellite hosts payloads that mature technologies and accelerate risk reduction efforts to inform programs of record. No details are known. Reportedly the USA 554 satellite carries multiple Space Force payloads, and is based on an ESPA ring, a circular structure with attachment ports for experiments and instruments.
It was launched on the USSF-106 mission on a Vulcan Centaur VC4S.
Another similar propulsive ESPA, USA 584, was launched on the on the USSF-87 mission on a Vulcan Centaur VC4S. It has been reported to be a prototype of a highly maneuverable satellite.
| Nation: | USA |
|---|---|
| Type / Application: | Technology |
| Operator: | |
| Contractors: | Northrop Grumman Innovation Systems (NGIS) |
| Equipment: | |
| Configuration: | Propulsive ESPA |
| Propulsion: | ? |
| Power: | Deployable solar array, batteries |
| Lifetime: | |
| Mass: | |
| Orbit: | GEO |
| Satellite | COSPAR | Date | LS | Launch Vehicle | Remarks | |
|---|---|---|---|---|---|---|
| USA 554 | 2025-173B | 13.08.2025 | CC LC-41 | Vulcan Centaur VC4S | with NTS 3 | |
| USA 584 | 2026-029C | 12.02.2026 | CC SLC-41 | Vulcan Centaur VC4S | with GSSAP 7, GSSAP 8 |
Launch Sites:
- CC = Cape Canaveral Air Force Station, Eastern Test Range, Cape Canaveral, Florida, USA
