WatchSat — Real-time Satellite Tracker
Watch 16,004 active satellites move in real time on an interactive 3D globe (catalog of 2026-09-17). Every point is a real spacecraft, propagated live in your browser from CelesTrak orbital data with the SGP4/SDP4 model and rendered over real NASA imagery.
Select any satellite to see its orbit and orbital elements, and compute the next naked-eye passes over your location — entirely on your device. Or leave orbit: the Moon, Sun and planets are placed by real ephemerides too.
Where the data comes from
Every orbit here is a two-line element set (TLE) published by CelesTrak, which redistributes the US Space Force tracking catalog. WatchSat ships a snapshot of that catalog — refreshed twice a week, and the source of every figure on this site — and refreshes from CelesTrak through its own edge-cached proxy while you watch. The positions themselves are computed on your device with the SGP4/SDP4 model, so no request tells a server which satellite you are looking at or where you are standing. Accuracy follows the age of the element set: a fresh low-Earth-orbit fit is good to about a kilometre and drifts by a kilometre or more per day, which is why every satellite page shows its epoch. The data & methodology notes give the full picture.
What is up there
16,004 active satellites is not an abstraction — it is a catalog you can browse object by object. Roughly two thirds of it is a single network, SpaceX’s Starlink; the rest spans OneWeb broadband, the GPS, GLONASS, Galileo and BeiDou navigation fleets, crewed space stations, and several thousand other active satellites doing weather, Earth observation, communications and science. The satellite directory lists every one of them with a live tracking page, and how many satellites are in orbit? explains why any single number is always an approximation.
Start exploring
- Track the ISS (NORAD 25544)
- ISS visible passes tonight
- Starlink train — visible tonight?
- Satellite directory — browse the full catalog
- Upcoming rocket launches
- Aurora forecast tonight
- Deep Space — Voyager 1 & 2, live
- Solar System — every planet’s real orbit, in one frame
- Who’s in space right now
- Elias 2-24 b — the youngest known planet
Constellations & groups
Guides
Home · Live satellite tracker · Satellite directory · Starlink · OneWeb · Navigation satellites · Space stations · Other active satellites · Track the ISS · ISS visible passes · Starlink train · Rocket launches · Aurora forecast · Humans in space · Solar System · Deep Space · Guide: spot the ISS · Guide: what is a TLE? · Guide: how many satellites? · Discovery: Elias 2-24 b · About · FAQ · Data & methodology · Credits · Contact · Privacy · Terms