Satellite · NORAD 28361 · COSPAR 2004-023A
NAVSTAR 55 (USA 178)
- Operator United States Space Force
- Constellation GPS (NAVSTAR)
- Country United States
Altitude now
19,880.4km
SGP4 propagation
Velocity
3.92km/s
Inclination
54.93°
Period
12.0 h
718.0 min
Perigee
19,761km
Apogee
20,604km
orbit agingOrbit updated 8 h ago · element epoch 10 Sept 2026 21:29 UTC (23.6 h old)· Metadata updated 8 h ago
Live position
Ground track & current position
Propagated client-side every 5 s from the latest element set (SGP4). Accuracy degrades with element age.
Loading ground track…
- Latitude
- 9.321° S
- Longitude
- 129.486° E
- Altitude
- 19880.4 km
- Velocity
- 3.918 km/s
- past 45 min
- next 90 min
- first fix from server render · element epoch 10 Sept 2026 21:29 UTC
Mission
Mission & classification
- Mission type derived
- Navigation
- Object type
- Payload
- SATCAT ops status
- Backup / standby [B]
- Radar cross-section
- 3.2 m²
- Constellation membership derived
- GPS (NAVSTAR) via name_pattern
Ownership
Operator & country
- Operator
- United States Space Force
- SATCAT owner code
- US · United States
- Country
- United States US
Launch
Launch
- Launch date
- 23 Jun 2004
- COSPAR launch id
- 2004-023
Objects from the same launch · 3
- DELTA 2 DEB29422DebrisDecayed
- DELTA 2 R/B(1)28362Rocket bodyDecayed
- DELTA 2 R/B(2) [PAM-D]28363Rocket bodyDecayed
Change log
History
| Field | Change | Source | Date |
|---|---|---|---|
| Status | ACTIVE → INACTIVE | Celestrak Satcat | 11 Sept 2026 18:53 UTC |
| Owner Code | ∅ → US | Celestrak Satcat | 11 Sept 2026 18:53 UTC |
| Orbit Class | ∅ → MEO | Celestrak | 11 Sept 2026 18:53 UTC |
Regulatory
UN registration
Transparency
Sources & provenance
CelesTrakcommunity
Orbital data courtesy of CelesTrak (Dr. T.S. Kelso).
last sync 6 h ago
CelesTrak SATCATcommunity
Satellite catalog data courtesy of CelesTrak.
last sync 8 h ago
Field provenance
| Field | Source | Observed | Confidence |
|---|---|---|---|
| Canonical Name | CelesTrak SATCAT | 11 Sept 2026 18:53 UTC | 100% |
| Decay Date | CelesTrak SATCAT | 11 Sept 2026 18:53 UTC | 100% |
| Launch Date | CelesTrak SATCAT | 11 Sept 2026 18:53 UTC | 100% |
| Object Type | CelesTrak SATCAT | 11 Sept 2026 18:53 UTC | 100% |
| Orbital Elements | CelesTrak | 11 Sept 2026 20:57 UTC | 100% |
| Owner Code | CelesTrak SATCAT | 11 Sept 2026 18:53 UTC | 100% |
| Status | CelesTrak SATCAT | 11 Sept 2026 18:53 UTC | 100% |
Timeline
Events
11 Sept 2026 18:53 UTC
DecommissionNAVSTAR 55 (USA 178) reported inactive
SATCAT status changed ? → B.
confidence 80%
Reference
Identifiers
- NORAD catalogue number
- 28361
- COSPAR / international designator
- 2004-023A
- SatelliteIndex id
- sat_01M28X2SWT01QM2JGQ9QTBM25P
- Canonical slug
- navstar-55-usa-178-28361
Orbit class, mission type and constellation membership are derived by SatelliteIndex (Navigation) — see the methodology. Positions are propagated estimates, not tracking measurements; never use them for conjunction assessment.