TACSAT 4

MilitaryHEOUnited States

TACSAT 4 is a military satellite, as listed in Jonathan McDowell's GCAT catalogue, with ownership listed as United States in CelesTrak's catalogue, currently in a highly elliptical orbit ranging from 379 km to 12,023 km. It completes one orbit of Earth roughly every 234 minutes at an inclination of 62.9°. It was launched in 2011. Track its live position and see when it passes over your location on azmth.

Orbital data

NORAD ID: 37818
COSPAR ID: 2011-052A
Type: Military
Orbit: HEO
Perigee (lowest): 379 km
Apogee (highest): 12,023 km
Inclination: 62.85°
Orbital period: 234 min
Launch year: 2011
Owner (CelesTrak): United States

Orbital data updated: 2026-10-17 · from CelesTrak, refreshed every 2 hours.

Who operates it

United StatesLIVEMission ended about Jan 2014

Communications

Independent assessment

GCAT classes it as a military satellite for communications and records its mission as ended in about Jan 2014 (17 Oct 2026).

Data: GCAT · CC BY 4.0 Class, mission and status adapted from GCAT by Jonathan McDowell, CC BY 4.0, data update 17 Oct 2026.

Military satellites, counted and explained →

About HEO orbit

Highly Elliptical Orbit. An elongated orbit that swings close to Earth at perigee and far away at apogee. Includes Molniya and Tundra orbits used for high-latitude coverage.