The 10 Best Satellites to See with the Naked Eye

You do not need a telescope or binoculars to watch satellites cross the sky. Dozens of objects in low Earth orbit are bright enough to see with your eyes alone, and with the right timing, several of them rival the brightest stars. Here are ten of the best satellites to look for, along with tips for planning your observation.

1. International Space Station (ISS)

The ISS is the single brightest satellite, regularly reaching magnitude -4. Its large solar arrays reflect enormous amounts of sunlight, making it unmistakable as it glides across the sky in two to six minutes. Track it live on the ISS tracker.

2. Starlink Trains

Freshly launched Starlink batches form a visible chain of lights moving in single file. During their first few days in orbit, they can be striking. Track The Sky's Starlink train detector highlights these recent launches and predicts their visibility.

3. Hubble Space Telescope

Orbiting at about 540 kilometers, Hubble reaches roughly magnitude 1.5 on favorable passes, making it visible as a moderately bright moving star. View its current position on the Hubble tracker.

4. China's Tiangong Space Station (CSS)

The Chinese Space Station is smaller than the ISS but still reaches magnitude -2 or brighter. It orbits at a similar altitude and can produce eye-catching passes. Track it at CSS tracker.

5. Iridium NEXT Satellites

While the original Iridium constellation was famous for predictable bright flares, the newer Iridium NEXT satellites are still visible as steady points of light at around magnitude 3 to 5. Browse them in the communication satellites category.

6. Terra and Aqua (Earth Observation)

NASA's Terra and Aqua satellites orbit in sun-synchronous paths and can reach magnitude 3. They are reliable targets during twilight windows.

7. BlueWalker 3

AST SpaceMobile's BlueWalker 3 prototype unfolded a 64 square-metre phased-array antenna in 2022, and that flat reflector makes it one of the brightest objects in orbit — around magnitude 0 to 1 on a favourable pass, rivalling the brightest stars. It orbits at roughly 450 kilometers. Track it at BlueWalker 3 tracker.

8. Envisat

ESA's Envisat was the largest Earth-observation satellite ever launched when it fell silent in 2012, and its 26-metre body and single large solar wing still tumble in a sun-synchronous orbit around 765 kilometers up. Favourable passes reach roughly magnitude 2 to 4, which is naked-eye territory from a dark site. Track it at Envisat tracker.

9. Landsat 8 and Landsat 9

These Earth-imaging satellites orbit at about 705 kilometers and can be spotted during favorable passes at around magnitude 4.

10. SL-16 (Zenit-2) Rocket Bodies

More than twenty spent Zenit-2 second stages, catalogued as SL-16 R/B, still circle at about 840 kilometers. Each is an empty stage some 10 meters long, bright enough to reach magnitude 2 to 3, and many of them tumble, so their brightness pulses as they cross the sky. They are also the largest abandoned objects in low Earth orbit, which is exactly why space debris is a growing concern.

Tips for Satellite Spotting

• The best viewing window is 30 to 90 minutes after sunset or before sunrise, when the sky is dark but satellites are still sunlit.
• Use Track The Sky's naked-eye visibility mode to filter for satellites bright enough to see without optics.
• Set your observer location to get accurate pass predictions, including approach direction and maximum elevation.
• Clear, dark skies away from city lights dramatically improve what you can see.