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HST — Live Satellite Tracking (NORAD 20580)
Track HST (NORAD catalog number 20580) 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 1990's 37th orbital launch (COSPAR designation 1990-037B).
Moving at about 7.63 km/s, HST flies in low Earth orbit at an altitude of roughly 477 × 479 km, completing one revolution every 94.0 minutes — about 15.3 trips around Earth per day. The orbit is essentially circular (eccentricity 0.0002). Its 28.5° inclination keeps its ground track over the tropics and lower mid-latitudes. Its orbital plane crosses the equator northbound at right ascension 240.6°. Earth's equatorial bulge drifts that plane westward about 6.83° per day.
Orbital elements
| Orbit regime | low Earth orbit (LEO) |
|---|---|
| Perigee × apogee altitude | ~477 km × 479 km |
| Inclination | 28.47° |
| Orbital period | 94.0 min (15.32 rev/day) |
| Eccentricity | 0.00015 |
| Element set epoch | 2026-09-07 |
| COSPAR designation | 1990-037B |
| NORAD catalog number | 20580 |
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
HST 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 HST from the ground?
Sometimes. Like most low-Earth-orbit spacecraft, HST 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 HST in the Other Active Satellites group — usually craft from the same or adjacent launches:
- LUSAT (LO-19) (NORAD 20442)
- FLTSATCOM 8 (USA 46) (NORAD 20253)
- COSMOS 2024 (ETALON 2) (NORAD 20026)
- COSMOS 1989 (ETALON 1) (NORAD 19751)
- TDRS 3 (NORAD 19548)
- TDRS 5 (NORAD 21639)
Browse the Other Active Satellites directory or the full satellite directory · What is a TLE? · WatchSat live globe