▸Orbital parameters

Orbit class	GEO
Inclination	2.2790°
Eccentricity	0.0002768
Period	1435.9 min
Apogee	35,795 km
Perigee	35,771 km
Mean motion	1.00285152 rev/day
RAAN	43.7650°
Arg of perigee	63.1609°
Mean anomaly	259.2085°
B*	0.0000e+0
Rev at epoch	3,479

▸Two-line element set (TLE)

EPOCH Jul 7, 2026SOURCE CelesTrakDERIVED currentUPDATED Jul 7, 2026

1 41937U 17004A 26188.16572669 .00000140 00000-0 00000-0 0 9998

2 41937 2.2790 43.7650 0002768 63.1609 259.2085 1.00285152 34797

▸ source OMM (JSON)

{
  "OBJECT_NAME": "SBIRS GEO-4 (USA 273)",
  "OBJECT_ID": "2017-004A",
  "EPOCH": "2026-07-07T03:58:38.786+00:00",
  "MEAN_MOTION": 1.00285152,
  "ECCENTRICITY": 0.0002768,
  "INCLINATION": 2.279,
  "RA_OF_ASC_NODE": 43.765,
  "ARG_OF_PERICENTER": 63.1609,
  "MEAN_ANOMALY": 259.2085,
  "EPHEMERIS_TYPE": 0,
  "CLASSIFICATION_TYPE": "U",
  "NORAD_CAT_ID": 41937,
  "REV_AT_EPOCH": 3479,
  "BSTAR": 0,
  "MEAN_MOTION_DOT": 0.0000014,
  "MEAN_MOTION_DDOT": 0
}

Reconstructed from CelesTrak OMM mean-elements (element-set number is a placeholder). TLE/OMM data is approximate. Not for operational use or collision avoidance.

▸Satellite metadata

Name	SBIRS GEO-4 (USA 273)
Operator	US Air Force Space CommandHIGHvia GCAT — Jonathan McDowell's General Catalog⚠ sources disagree United States Air ForceMEDIUMvia Wikidata
Country	United States
Launch date	Jan 21, 2017HIGHvia GCAT — Jonathan McDowell's General Catalog
Launch mass (kg)	4500HIGHvia GCAT — Jonathan McDowell's General Catalog

▸Data quality

Score90 / 100

Claims8

Sources2

TLEavailable

▸Sources

GCAT — Jonathan McDowell's General CatalogCC BY 4.0planet4589.org
WikidataCC0 1.0query.wikidata.org

▸Actions

GET /api/v1/satellites/41937

//Orbital data is approximate and not for operational use. Last ingested from CelesTrak on Jul 7, 2026.