Home › Other Active Satellites › O3B FM4
O3B FM4 — Live Satellite Tracking (NORAD 39189)
Track O3B FM4 (NORAD catalog number 39189) 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 is object B of 2013's 31st orbital launch (COSPAR designation 2013-031B). It went up together with 3 other satellites from that launch still in the active catalog. As of this element set it had completed roughly 24,105 revolutions of Earth.
Moving at about 5.26 km/s, O3B FM4 operates in medium Earth orbit at roughly 8,066–8,080 km altitude, taking about 4.8 hours per revolution (5.00 orbits a day). The orbit is essentially circular (eccentricity 0.0005). Its near-equatorial 0.0° inclination keeps it above the tropics at all times. Its orbital plane crosses the equator northbound at right ascension 353.6°. Earth's equatorial bulge drifts that plane westward about 0.57° per day.
Orbital elements
| Orbit regime | medium Earth orbit (MEO) |
|---|---|
| Perigee × apogee altitude | ~8,066 km × 8,080 km |
| Inclination | 0.04° |
| Orbital period | 287.9 min (5.00 rev/day) |
| Eccentricity | 0.00046 |
| Element set epoch | 2026-09-05 |
| COSPAR designation | 2013-031B |
| NORAD catalog number | 39189 |
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
O3B FM4 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 O3B FM4 from the ground?
Not with the naked eye. At its altitude O3B FM4 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 O3B FM4 in the Other Active Satellites group — usually craft from the same or adjacent launches:
- O3B FM5 (NORAD 39188)
- O3B FM2 (NORAD 39190)
- O3B PFM (NORAD 39191)
- IRIS (NORAD 39197)
- IRNSS-1A (NORAD 39199)
- COSMOS 2486 (NORAD 39177)
Browse the Other Active Satellites directory or the full satellite directory · What is a TLE? · WatchSat live globe