NAVSTAR 77 (USA 289) is a payload in MEO orbit, operated by US Air Force Space and Missile Center, launched 2018.
| Orbit class | MEO |
| Inclination | 55.6931° |
| Eccentricity | 0.0038544 |
| Period | 718.0 min |
| Apogee | 20,285 km |
| Perigee | 20,080 km |
| Mean motion | 2.00562549 rev/day |
| RAAN | 91.3977° |
| Arg of perigee | 197.4128° |
| Mean anomaly | 334.8050° |
| B* | 0.0000e+0 |
| Rev at epoch | 5,547 |
1 43873U 18109A 26188.19764110 -.00000015 00000-0 00000-0 0 99952 43873 55.6931 91.3977 0038544 197.4128 334.8050 2.00562549 55475{
"OBJECT_NAME": "NAVSTAR 77 (USA 289)",
"OBJECT_ID": "2018-109A",
"EPOCH": "2026-07-07T04:44:36.191+00:00",
"MEAN_MOTION": 2.00562549,
"ECCENTRICITY": 0.0038544,
"INCLINATION": 55.6931,
"RA_OF_ASC_NODE": 91.3977,
"ARG_OF_PERICENTER": 197.4128,
"MEAN_ANOMALY": 334.805,
"EPHEMERIS_TYPE": 0,
"CLASSIFICATION_TYPE": "U",
"NORAD_CAT_ID": 43873,
"REV_AT_EPOCH": 5547,
"BSTAR": 0,
"MEAN_MOTION_DOT": -1.5e-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 77 (USA 289) |
| Operator | US Air 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 |