Satellite · NORAD 41937 · COSPAR 2017-004A
SBIRS GEO-4 (USA 273)
- Operator United States
- Constellation —
- Country United States
Altitude now
35,945.6km
SGP4 propagation
Velocity
3.07km/s
Inclination
2.41°
Period
1.0 d
1,444.7 min
Perigee
35,945km
Apogee
35,964km
orbit freshOrbit updated 22 h ago · element epoch 12 Sept 2026 03:34 UTC (6.3 h old)· Metadata updated 22 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
- 2.347° N
- Longitude
- 15.536° W
- Altitude
- 35945.6 km
- Velocity
- 3.069 km/s
- past 45 min
- next 90 min
- first fix from server render · element epoch 12 Sept 2026 03:34 UTC
Mission
Mission & classification
Ownership
Operator & country
- Operator
- —
- SATCAT owner code
- US · United States
- Country
- United States US
Launch
Launch
- Launch date
- 21 Jan 2017
- COSPAR launch id
- 2017-004
Objects from the same launch · 1
- ATLAS 5 CENTAUR R/B41938Rocket bodyDecayed
Change log
History
| Field | Change | Source | Date |
|---|---|---|---|
| Country Code | ∅ → US | Celestrak Satcat | 11 Sept 2026 18:53 UTC |
| Owner Code | ∅ → US | Celestrak Satcat | 11 Sept 2026 18:53 UTC |
| Orbit Class | ∅ → GEO | 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 22 h ago
CelesTrak SATCATcommunity
Satellite catalog data courtesy of CelesTrak.
last sync 36 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 | 12 Sept 2026 09:09 UTC | 100% |
| Owner Code | CelesTrak SATCAT | 11 Sept 2026 18:53 UTC | 100% |
| Status | CelesTrak SATCAT | 11 Sept 2026 18:53 UTC | 100% |
Quality flags
- UNKNOWN_OPERATORactive payload without resolved operator11 Sept 2026
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
- 41937
- COSPAR / international designator
- 2017-004A
- SatelliteIndex id
- sat_01M28X2SWY7BJXFXBAARKWTH0A
- Canonical slug
- sbirs-geo-4-usa-273-41937
Orbit class, mission type and constellation membership are derived by SatelliteIndex (Military) — see the methodology. Positions are propagated estimates, not tracking measurements; never use them for conjunction assessment.