WatchSat — Live Satellite Tracker

WatchSat is a free live satellite tracker: watch 16,765 active satellites move in real time on an interactive 3D globe (catalog of 2026-10-23). 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

16,765 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.

From the blog

How many times can a Falcon 9 booster fly? The reuse record: Falcon 9 booster B1067 flew a record 37th time on August 25, 2026. SpaceX says its boosters are built for up to 40 flights.
How far away is the Moon? Distance, perigee and supermoons: How far away is the Moon? 384,400 km (238,855 miles) on average. In 2026 it ranges from 356,641 to 406,407 km, closest on December 24.
What is Kessler syndrome? How a space debris cascade works: Kessler syndrome is a runaway chain of collisions in orbit, first described in 1978. ESA's 2026 report projects low-orbit collisions climbing fast.
What is the Kp index? How to read an aurora forecast: The Kp index rates geomagnetic activity from 0 to 9 every three hours. Kp 5 is a G1 storm, and each step brings the aurora about 2 degrees nearer the equator.
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