Satellite · NORAD 43873 · COSPAR 2018-109A
NAVSTAR 77 (USA 289)
- Operator United States Space Force
- Constellation GPS (NAVSTAR)
- Country United States
Altitude now
20,233.8km
SGP4 propagation
Velocity
3.87km/s
Inclination
55.74°
Period
12.0 h
718.0 min
Perigee
20,076km
Apogee
20,288km
orbit agingOrbit updated 3 d ago · element epoch 10 Sept 2026 15:49 UTC (29.3 h old)· Metadata updated 3 d 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
- 54.874° N
- Longitude
- 144.471° W
- Altitude
- 20233.8 km
- Velocity
- 3.868 km/s
- past 45 min
- next 90 min
- first fix from server render · element epoch 10 Sept 2026 15:49 UTC
Mission
Mission & classification
Ownership
Operator & country
- Operator
- United States Space Force
- SATCAT owner code
- US · United States
- Country
- United States US
Launch
Launch
- Launch date
- 23 Dec 2018
- COSPAR launch id
- 2018-109
Objects from the same launch
No other catalogued object is linked to this launch.
Change log
History
| Field | Change | Source | Date |
|---|---|---|---|
| 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 2 d ago
CelesTrak SATCATcommunity
Satellite catalog data courtesy of CelesTrak.
last sync 3 d 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
No events detected for this object yet. Launches, decays and orbit changes are generated by the derived-analytics connector.
Reference
Identifiers
- NORAD catalogue number
- 43873
- COSPAR / international designator
- 2018-109A
- SatelliteIndex id
- sat_01M28X2SX0V594GM8XW5ZB1SC1
- Canonical slug
- navstar-77-usa-289-43873
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.