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TACSAT 4 — Live Satellite Tracking (NORAD 37818)
Track TACSAT 4 (NORAD catalog number 37818) live on the WatchSat interactive 3D globe above. Its position is propagated in real time from the latest CelesTrak two-line element set using the SGP4/SDP4 orbital model — the same math professional trackers run. It has been on orbit since 2011, launched on the 52nd orbital launch of that year (COSPAR designation 2011-052A). As of this element set it had completed roughly 32,979 revolutions of Earth.
Its speed swings from 3.41 km/s at apogee to 9.29 km/s at perigee. TACSAT 4 follows a highly elliptical orbit, completing a revolution every 3.9 hours. The orbit is strongly elliptical (eccentricity 0.4628): each revolution swings from 384 km at perigee out to 12,022 km at apogee. Inclined 62.8° to the equator, it overflies every latitude up to about 63° north and south. Its orbital plane crosses the equator northbound at right ascension 64.1°. Earth's equatorial bulge drifts that plane westward about 0.68° per day.
Orbital elements
| Orbit regime | highly elliptical orbit (HEO) |
|---|---|
| Perigee × apogee altitude | ~384 km × 12,022 km |
| Inclination | 62.85° |
| Orbital period | 233.9 min (6.16 rev/day) |
| Eccentricity | 0.46280 |
| Element set epoch | 2026-09-06 |
| COSPAR designation | 2011-052A |
| NORAD catalog number | 37818 |
This page's orbital elements come from the CelesTrak catalog of 2026-09-08. The live 3D view above fetches its own current CelesTrak data when the page opens, through an edge cache that refreshes roughly every 30 minutes.
About the Other Active Satellites group
TACSAT 4 is one of 4,471 active satellites in WatchSat's general catalog — the broad population of Earth-observation, communications, science, amateur-radio and technology spacecraft outside the giant broadband constellations. Browse all other active satellites live in 3D.
Can you see TACSAT 4 from the ground?
Not with the naked eye. At its altitude TACSAT 4 is far beyond unaided visibility — following satellites this high takes a telescope and good timing. You can still track it precisely in the live 3D view above, or check pass predictions for your location.
Related satellites
Nearest catalog neighbors of TACSAT 4 in the Other Active Satellites group — usually craft from the same or adjacent launches:
- EUTELSAT 7 WEST A (NORAD 37816)
- ARABSAT-5C (NORAD 37810)
- QUETZSAT 1 (NORAD 37826)
- SES-2 (NORAD 37809)
- INTELSAT 18 (IS-18) (NORAD 37834)
- EUTELSAT 16A (NORAD 37836)
Browse the Other Active Satellites directory or the full satellite directory · What is a TLE? · WatchSat live globe