NAVSTAR 54 (USA 177) is a payload in MEO orbit, operated by US Air Force Space and Missile Center, launched 2004.
| Orbit class | MEO |
| Inclination | 54.8133° |
| Eccentricity | 0.0116897 |
| Period | 718.0 min |
| Apogee | 20,494 km |
| Perigee | 19,873 km |
| Mean motion | 2.00554040 rev/day |
| RAAN | 274.8940° |
| Arg of perigee | 173.9696° |
| Mean anomaly | 165.7920° |
| B* | 0.0000e+0 |
| Rev at epoch | 16,333 |
1 28190U 04009A 26187.80830027 -.00000022 00000-0 00000-0 0 99902 28190 54.8133 274.8940 0116897 173.9696 165.7920 2.00554040163339{
"OBJECT_NAME": "NAVSTAR 54 (USA 177)",
"OBJECT_ID": "2004-009A",
"EPOCH": "2026-07-06T19:23:57.143+00:00",
"MEAN_MOTION": 2.0055404,
"ECCENTRICITY": 0.0116897,
"INCLINATION": 54.8133,
"RA_OF_ASC_NODE": 274.894,
"ARG_OF_PERICENTER": 173.9696,
"MEAN_ANOMALY": 165.792,
"EPHEMERIS_TYPE": 0,
"CLASSIFICATION_TYPE": "U",
"NORAD_CAT_ID": 28190,
"REV_AT_EPOCH": 16333,
"BSTAR": 0,
"MEAN_MOTION_DOT": -2.2e-7,
"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.
| Name | NAVSTAR 54 (USA 177) |
| Operator | US Air Force Space and Missile CenterHIGHvia GCAT — Jonathan McDowell's General Catalog⚠ sources disagree |
| Country | |
| Launch date | |
| Launch mass (kg) | 1077HIGH |
//Orbital data is approximate and not for operational use. Last ingested from CelesTrak on Jul 7, 2026.
| Mission purpose | — |
| Object class |
| Orbital regime |
| Status |