Every few weeks, SpaceX launches another batch of Starlink satellites — and for a brief window of 1 to 2 weeks after each launch, the night sky over your location may host one of the most striking spectacles you can see with the naked eye: a Starlink train. A chain of bright, evenly spaced dots moving in perfect formation across the sky, one after the other, for up to 10–15 minutes without stopping.
People who see it for the first time often think they are watching a UFO. Videos of Starlink trains go viral on social media every single launch cycle. This guide explains exactly what a Starlink train is, how to predict when one will pass over you tonight, and how to make sure you do not miss it.
What Is a Starlink Train?
A Starlink train is a formation of newly launched Starlink satellites travelling together in their initial deployment orbit before raising altitude to their operational shell. SpaceX typically launches 20–23 satellites per Falcon 9 mission. Once in orbit, they deploy in sequence and drift apart slightly, forming the characteristic chain shape.
Each dot is one Starlink satellite. The bright green lead dot is the first deployed satellite — subsequent ones follow roughly every 4–8 seconds of visual time at peak brightness.
At their initial deployment altitude of roughly 300–350 km, the satellites are close to Earth, moving fast, and their large flat solar panels are still face-on toward the ground — reflecting maximum sunlight. This is why they appear so extraordinarily bright in the first days after launch.
Why Are Fresh Trains So Bright?
The brightness of a Starlink satellite depends on two things: its altitude and the orientation of its solar panels relative to you. Immediately after deployment, the satellites have not yet been commanded to rotate their panels edge-on to Earth — they remain in their initial flat configuration, reflecting maximum sunlight downward. Combined with their low deployment altitude, this creates satellites that can reach magnitude +1 to +3, as bright as the most prominent stars in the sky.
Once the satellites raise their operational orbit to ~550 km and rotate their panels, brightness drops dramatically — often to magnitude +5 or fainter, invisible under any light pollution. The window to see a train with the naked eye is therefore narrow and not to be missed.
| Phase | Altitude | Typical Magnitude | Naked Eye? |
|---|---|---|---|
| 🟢 Fresh train (days 1–7) | ~300–350 km | +1 to +3 | ✅ Easily visible |
| 🟡 Active train (days 7–14) | ~350–450 km | +3 to +4 | ✅ Visible in dark sky |
| 🟠 Raising orbit (days 14–28) | ~450–550 km | +4 to +5 | ⚠️ Borderline, dark sky needed |
| ⚫ Operational (after 4 weeks) | ~550 km | +5 to +7 | ❌ Usually invisible |
The Visibility Window: How Long Do Trains Last?
The best window to spot a Starlink train as a chain of lights — rather than scattered individual satellites — is the first 7–14 days after launch. During this period the satellites are still in a tight formation and have not yet fully dispersed into their individual orbital planes.
How to Predict the Next Starlink Pass
The single most important step is finding out when a train will cross your particular location. Starlink passes are highly location-dependent — a pass visible from London may be completely below the horizon in Madrid at the same time. Use SatFleetLive's Next Passes to get predictions tailored to your exact coordinates.
- Open Next Passes and allow location access Go to satfleetlive.com/next-passes.html and allow the location prompt. Accurate GPS coordinates are essential — Starlink pass times can vary by several minutes just 100 km apart. You can also manually set any location using the "Change location" button.
- Select "Starlink / Internet" from the satellite type filter This category loads thousands of Starlink satellites — the page warns this may take a moment. The calculation covers the entire constellation to surface every potential pass including trains from recent launches.
- Set the days to 3 and hit Calculate Passes Three days gives a broad selection without excessive calculation time. Trains from a recent launch will dominate the brightest results.
- Sort by "Earliest first" and look for clusters A train shows up as multiple cards labelled STARLINK-XXXX, all starting within 2–8 minutes of each other and travelling in the same compass direction. The more entries in a cluster, the more satellites you will see in the chain.
- Note the start time, direction, and max elevation Write down these three values. The Direction field tells you which compass point to face. A pass above 40° will be noticeably brighter and more impressive than a low-horizon pass.
Look for 3 or more STARLINK-XXXX entries with consecutive NORAD IDs, starting within a few minutes of each other, all travelling the same compass direction. That cluster is your train. The higher the max elevation and the more entries in the cluster, the more spectacular the show will be.
What Exactly to Look For in the Sky
Once you are outside and facing the right direction, here is what the experience actually looks like:
The first dot appears
A single bright dot — similar to a medium-bright star — rises above the horizon from the predicted direction and moves steadily across the sky. It does not flash or blink like an aircraft. It moves in a smooth, consistent arc, crossing your visible sky in about 4–8 minutes.
More dots follow in the same track
A few seconds to a minute after the first, another dot appears from exactly the same point on the horizon and follows the identical path. Then another. Then another. Each satellite is a near-perfect copy of the last — same brightness, same arc, same speed, evenly spaced. This is the train.
The chain may last 10–15 minutes
In a fresh, dense train you may watch 20–40 satellites cross your sky in succession before the chain ends. The effect is deeply uncanny — a conveyor belt of lights rolling silently across the stars. Nothing else in the night sky looks quite like it.
Some satellites may disappear mid-pass
Individual satellites will sometimes vanish abruptly before reaching the other horizon. This happens when they enter Earth's shadow — the same reason the ISS sometimes disappears mid-pass. It is not a malfunction; the satellite simply stopped catching direct sunlight. The next one in the chain will continue exactly as before.
Best Conditions for Spotting a Train
Starlink satellites are only visible when three conditions are satisfied simultaneously — the same three that govern all naked-eye satellite visibility.
1. You must be in darkness
The Sun must be at least 6° below your horizon (civil twilight or darker). Passes during daylight are invisible. The optimal window is the first 90 minutes after sunset and the last 90 minutes before sunrise — you are in darkness, but the satellites at 300–550 km altitude are still catching sunlight.
2. The satellites must be in sunlight
Even during your night, satellites can enter Earth's shadow mid-pass. Passes during deep night — when shadow geometry is unfavourable — will show far fewer visible satellites than predicted. Twilight windows are consistently better because the geometry almost always keeps satellites illuminated for the full crossing of your sky.
3. The pass must be high enough
A maximum elevation above 30° is the minimum for a rewarding view. Below 20° the satellites are close to the horizon, dimmed by atmospheric haze, and easily blocked by buildings or trees. A pass above 50° is spectacular — the satellites are bright and you can track them across a wide arc without moving your feet.
Tips for a Successful Observation
Protect your night vision
Put your phone screen face-down for at least 3 minutes before the pass. Even dim screen glow collapses your dark adaptation. Use a red-light torch if you need to see anything.
Face the start direction early
The Direction field in Next Passes tells you where to look. Face that way 2 minutes before the start time and scan slowly. The first dot is easy to miss if you are not already watching the right part of the sky.
Pick a twilight pass, not just any pass
Always choose a post-sunset or pre-sunrise pass over a deep-night one. Even a slightly lower-elevation twilight pass typically shows more satellites than a high-elevation deep-night pass.
Check the weather first
Cloud cover is the only thing that can ruin a perfect prediction. Check sky conditions before heading out — even thin high cloud can obscure the dimmer satellites in the chain.
Find an open horizon
Trees and buildings block low-elevation satellites. A park, open field, rooftop, or beach gives you the widest arc and the best chance of catching the train from first to last.
Photograph the train
Place your camera on a solid surface and shoot a 15–30 second exposure along the train's direction of travel. Multiple satellites leave parallel streaks — an instantly striking photo that requires no special equipment.