Home › Other Active Satellites › SZ-21 MODULE
SZ-21 MODULE — Live Satellite Tracking (NORAD 66515)
Track SZ-21 MODULE (NORAD catalog number 66515) 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 C of 2025's 246th orbital launch (COSPAR designation 2025-246C). As of this element set it had completed roughly 4,670 revolutions of Earth.
Moving at about 7.72 km/s, SZ-21 MODULE flies in low Earth orbit at an altitude of roughly 318 × 333 km, completing one revolution every 90.9 minutes — about 15.8 trips around Earth per day. The orbit is essentially circular (eccentricity 0.0012). Its 41.5° inclination keeps its ground track over the tropics and lower mid-latitudes. Its orbital plane crosses the equator northbound at right ascension 154.2°. Earth's equatorial bulge drifts that plane westward about 6.30° per day.
Orbital elements
| Orbit regime | low Earth orbit (LEO) |
|---|---|
| Perigee × apogee altitude | ~318 km × 333 km |
| Inclination | 41.47° |
| Orbital period | 90.9 min (15.84 rev/day) |
| Eccentricity | 0.00118 |
| Element set epoch | 2026-09-07 |
| COSPAR designation | 2025-246C |
| NORAD catalog number | 66515 |
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
SZ-21 MODULE 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 SZ-21 MODULE from the ground?
Sometimes. Like most low-Earth-orbit spacecraft, SZ-21 MODULE is visible only around dawn and dusk, when your sky is dark but the satellite is still sunlit — and whether you can spot it depends on its size and reflectivity. See pass predictions for your location for when it is above your horizon and sunlit.
Related satellites
Nearest catalog neighbors of SZ-21 MODULE in the Other Active Satellites group — usually craft from the same or adjacent launches:
- SENTINEL-6B (NORAD 66514)
- SHIJIAN-30A (SJ-30A) (NORAD 66545)
- SHIJIAN-30B (SJ-30B) (NORAD 66546)
- SHIJIAN-30C (SJ-30C) (NORAD 66547)
- SHIJIAN-28 (SJ-28) (NORAD 66549)
- GLOBAL-33 (NORAD 66554)
Browse the Other Active Satellites directory or the full satellite directory · What is a TLE? · WatchSat live globe