NAVSTAR 81 (USA 319) is a payload in MEO orbit, operated by US Space Force Space and Missile Center, launched 2021.
| Orbit class | MEO |
| Inclination | 55.1641° |
| Eccentricity | 0.0026177 |
| Period | 718.0 min |
| Apogee | 20,251 km |
| Perigee | 20,112 km |
| Mean motion | 2.00567735 rev/day |
| RAAN | 331.6665° |
| Arg of perigee | 228.4644° |
| Mean anomaly | 125.3794° |
| B* | 0.0000e+0 |
| Rev at epoch | 3,714 |
1 48859U 21054A 26187.94358801 -.00000071 00000-0 00000-0 0 99972 48859 55.1641 331.6665 0026177 228.4644 125.3794 2.00567735 37142{
"OBJECT_NAME": "NAVSTAR 81 (USA 319)",
"OBJECT_ID": "2021-054A",
"EPOCH": "2026-07-06T22:38:46.004+00:00",
"MEAN_MOTION": 2.00567735,
"ECCENTRICITY": 0.0026177,
"INCLINATION": 55.1641,
"RA_OF_ASC_NODE": 331.6665,
"ARG_OF_PERICENTER": 228.4644,
"MEAN_ANOMALY": 125.3794,
"EPHEMERIS_TYPE": 0,
"CLASSIFICATION_TYPE": "U",
"NORAD_CAT_ID": 48859,
"REV_AT_EPOCH": 3714,
"BSTAR": 0,
"MEAN_MOTION_DOT": -7.1e-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 81 (USA 319) |
| Operator | US Space Force Space and Missile CenterHIGHvia GCAT — Jonathan McDowell's General Catalog⚠ sources disagree |
| Country | |
| Launch date | |
| Launch mass (kg) | 4400 |
//Orbital data is approximate and not for operational use. Last ingested from CelesTrak on Jul 7, 2026.
| Mission purpose | — |
| Object class |
| Orbital regime |
| Status |