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BEIDOU-3S M1S — Live Satellite Tracking (NORAD 40749)
Track BEIDOU-3S M1S (NORAD catalog number 40749) 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 2015's 37th orbital launch (COSPAR designation 2015-037B). It went up together with 1 other satellite from that launch still in the active catalog. As of this element set it had completed roughly 7,563 revolutions of Earth.
Moving at about 3.78 km/s, BEIDOU-3S M1S operates in medium Earth orbit at roughly 21,528–21,538 km altitude, taking about 12.9 hours per revolution (1.86 orbits a day). The orbit is essentially circular (eccentricity 0.0002). Inclined 54.8° to the equator, it overflies every latitude up to about 55° north and south. Its orbital plane crosses the equator northbound at right ascension 299.2°.
Orbital elements
| Orbit regime | medium Earth orbit (MEO) |
|---|---|
| Perigee × apogee altitude | ~21,528 km × 21,538 km |
| Inclination | 54.79° |
| Orbital period | 773.1 min (1.86 rev/day) |
| Eccentricity | 0.00018 |
| Element set epoch | 2026-09-06 |
| COSPAR designation | 2015-037B |
| NORAD catalog number | 40749 |
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 Navigation group
BEIDOU-3S M1S is part of China's BeiDou fleet — one of 173 global-navigation satellites in the WatchSat catalog across GPS, GLONASS, Galileo and BeiDou. GNSS spacecraft broadcast precise time signals from orbits around 20,000 km up; a phone fixes its position by comparing several of them at once. See the whole navigation group live in 3D.
Can you see BEIDOU-3S M1S from the ground?
Not with the naked eye. At its altitude BEIDOU-3S M1S 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 BEIDOU-3S M1S in the Navigation group — usually craft from the same or adjacent launches:
- BEIDOU-3S M2S (NORAD 40748)
- NAVSTAR 74 (USA 262) (NORAD 40730)
- GSAT-6 (NORAD 40880)
- GSAT0206 (GALILEO 10) (NORAD 40890)
- BEIDOU-3S IGSO-2S (NORAD 40938)
- BEIDOU-3S IGSO-1S (NORAD 40549)
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