Satellites/NAVSTAR 81 (USA 319)

NAVSTAR 81 (USA 319)

Satellite · United StatesActive

NORAD Number

48859

COSPAR ID

2021-054A

Launched

2021-06-17

site code AFETR

Orbit

MEO

Constellation

GPS

Who

Owner / operatorUS Space Force Space and Missile Center

ManufacturerLockheed Martin Space Systems (Denver), Astronautics Operations

CountryUnited States

Catalogue owner codeUS

Orbit

OrbitingEarth

Orbit classMEO

Perigee20,104 km

Apogee20,261 km

Inclination55.1°

Period718 min

Radar cross-section—

Latest Orbital Elements

Epoch (UTC)2026-11-08 20:16:07

Mean motion2.005608 rev/day

Eccentricity0.0029463

Inclination55.0954°

Right ascension of node326.633°

Argument of perigee233.6297°

Mean anomaly305.0348°

B* drag term0.0000e+0

Element set999

Revolutions at epoch3,965

Mean elements (OMM) for the SGP4 model, refreshed every 6 hours. They describe the orbit at the epoch shown and drift as time passes, fastest for low orbits.

Source: CelesTrak satellite catalogue and GP data (celestrak.org); owner and manufacturer from GCAT (J. McDowell, CC BY 4.0).