Use different services for different events: NASA’s Spot the Station is the best official alert for seeing the International Space Station (ISS); Space Launch Now is the broadest launch calendar for major agencies; the European Space Agency’s (ESA) re-entry portal is the specialist source for predicted satellite and rocket-body re-entries; and Space-Track.org provides deeper decay data for technical users. No single app covers visible passes, worldwide launches and uncertain re-entries equally well.
Choose the alert type before choosing an app
“Orbit alerts” can mean several different things. A visible ISS pass is a short, location-specific skywatching opportunity. A rocket-launch alert follows a scheduled event whose time can change because of weather, range availability or technical checks. A re-entry alert concerns an object falling through the atmosphere, where the predicted time and footprint can remain uncertain until late in the event.
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- Want to see the ISS? Choose NASA Spot the Station.
- Want a calendar of launches worldwide? Choose Space Launch Now.
- Want warnings about a satellite or rocket body re-entering? Start with ESA’s re-entry predictions portal.
- Need orbital-decay data for research or operations? Use Space-Track.org.
Pass-prediction services such as Heavens-Above and ISS Detector can supplement the official sources, especially when you want broader satellite-pass coverage. They should not be treated as substitutes for an authoritative re-entry notice.
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Service comparison
| Service | Primary alert | Location or geographic scope | Coverage and data character | Account and availability |
|---|---|---|---|---|
| NASA Spot the Station | ISS visible passes and viewing notifications | Personalized to a preferred location | Official NASA schedules, real-time tracking, duration and visibility conditions | iOS and Android; the NASA FAQ describes push notifications. Account requirements are not stated in the service description. |
| Space Launch Now | Rocket-launch schedules, countdowns and alerts | Worldwide calendar rather than a single observer location | Major providers including SpaceX, NASA, ULA, ISRO, JAXA, Roscosmos and ESA; third-party listing | Google Play listing; current notification permissions and platform support should be checked in the store. |
| ESA Space Debris Office re-entry predictions | Predicted satellite and rocket-body re-entries | Global events, with predicted windows and footprints | ESA tracking and modelling; predictions are continuously revised as new tracking arrives | Web portal with free registration required: reentry.esoc.esa.int/reentry |
| Space-Track.org | Satellite decay and re-entry products | Global catalog and orbital data | Technical space-situational-awareness products maintained for approved users | Valid user account required; web service. Casual-notification features are not stated. |
| Heavens-Above | Satellite and ISS pass predictions | Observer-location based | Independent comparison identifies it as a strong all-around prediction tool | Current platform support and features should be verified; details are not stated in the service description. |
| ISS Detector | Mobile pass notifications | Observer-location based | Independent comparison identifies it as a convenient option for pass alerts | Current platform support and features should be verified; details are not stated in the service description. |
NASA Spot the Station: best for ISS flyover alerts
NASA describes Spot the Station as an official app that helps people find when the ISS will be visible overhead at their location. Its purpose is narrow, which is an advantage: the alerts are designed around an observer’s position rather than a general launch-news feed.
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The NASA FAQ says the app provides real-time tracking, location-specific flyover schedules and push notifications. A notification can include the pass date, start time, duration and visibility conditions for the selected location. The app is available for both iOS and Android.
Set up an ISS alert
- Install Spot the Station from the iOS or Android app store.
- Allow location access, or enter the viewing location the app requests. A precise location matters because an ISS pass may be visible from one town and poorly placed from another.
- Enable notification permission when the operating system asks. If notifications were previously denied, turn them on in the phone’s app-notification settings.
- Review the upcoming flyover schedule and check the listed visibility conditions, duration and date before heading outside.
- Use the app’s real-time tracking around the predicted pass to confirm the station’s position.
What Spot the Station does not replace
Spot the Station is not a worldwide rocket-launch calendar and is not a satellite-reentry warning system. It is the clearest official choice when the reader’s question is specifically, “When will the ISS fly over my location?” For other spacecraft, use a pass-prediction service such as Heavens-Above or ISS Detector, while recognizing that their current features and platform support should be checked before relying on them.
Space Launch Now: broad alerts for scheduled launches
Space Launch Now is aimed at people who want one calendar covering launches from multiple agencies and providers. Its Google Play listing describes real-time schedules, live countdowns, mission information and alerts for SpaceX, NASA, United Launch Alliance (ULA), ISRO, JAXA, Roscosmos, ESA and other major operators.
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This breadth makes it the practical first choice for a reader asking for the “best rocket-launch tracker.” It can put a launch date, countdown and mission context in one feed instead of requiring separate agency calendars.
Configure launch notifications
- Install the app from the current store listing and review the publisher, version and supported devices before enabling it.
- Allow notifications so countdown and schedule-change messages can arrive. Mobile operating systems may also restrict background activity or quiet notifications in battery-saving modes.
- Browse the launch calendar and open individual missions for the stated launch time, provider and mission details.
- Check the schedule again on launch day. A listed time is an operating target, not a guarantee: weather, range status and technical reviews can move it.
- For a launch you intend to watch live, confirm the provider’s latest announcement as well as the app’s countdown.
Important limits
Space Launch Now is a third-party app listing, so its coverage, notification behavior and supported platforms can change. Store permissions and the current listing should be checked before depending on it for a time-critical event. Even a well-maintained calendar cannot remove the operational uncertainty of a launch.
ESA’s re-entry portal: the specialist source for falling spacecraft
For a satellite, upper stage or other tracked object returning through the atmosphere, ESA’s Space Debris Office re-entry predictions portal is the most directly relevant public service in this group. ESA says predictions are updated as new tracking information arrives and are shared through the web portal. Free registration is required.
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Open the portal at https://reentry.esoc.esa.int/reentry, create the required account and review the listed upcoming or past re-entries. The service is web-based, so it is useful on a phone or computer, but it is not presented as a simple consumer push-alert app.
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- Time window: The predicted interval can be wide because the object’s atmospheric drag, attitude and remaining orbit are difficult to know exactly.
- Ground track or footprint: A map shows where the object could pass, not a guaranteed impact point. Most of the footprint may be over ocean or sparsely populated areas.
- Update status: Re-check the portal as the event approaches. New tracking observations can move the window and alter the projected path.
- Object identity: Confirm whether the entry is a spacecraft, rocket body or another cataloged object before interpreting the event.
Why the forecast changes
Uncontrolled objects speed up their descent as atmospheric drag increases, but the upper atmosphere expands and contracts with solar and geomagnetic activity. Small errors in the object’s orbit or physical orientation compound over many revolutions. That is why an early prediction can cover many hours and then narrow substantially near the final event.
Scale and safety context
ESA’s 2024 release about ERS-2 stated that, on average, one spacecraft re-enters Earth’s atmosphere each month. ESA’s portal also records that from the beginning of the Space Age through January 2016, more than 23,600 human-made objects had been confirmed to re-enter, totaling about 33,200 metric tons. These figures describe the scale of re-entry activity, not a prediction for any individual location.
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ESA’s current space-safety guidance describes a commonly accepted casualty-probability threshold of 1 in 10,000 for a single uncontrolled re-entry. That threshold is used for risk assessment; it does not mean that every predicted re-entry has a one-in-10,000 chance of injuring someone, nor does it identify a particular street or property.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Space-Track.org: technical decay and re-entry data
Space-Track.org is designed for space-situational-awareness work rather than casual skywatching. Its documented products include the satellite catalog, orbital elements and satellite decay or re-entry predictions. NASA’s Conjunction Assessment and Risk Analysis (CARA) FAQ says the service is hosted and maintained by the 18th Space Defense Squadron and provides re-entry predictions to approved users.
Who should use it
- Satellite operators who need catalog and orbital-element data.
- Researchers building their own tracking or decay analysis.
- Technical users who need machine-readable or detailed products rather than a simplified phone alert.
Access and workflow
- Request and maintain a valid Space-Track user account.
- Review the catalog record and orbital data for the object of interest.
- Use the available decay or re-entry products to follow changes over time.
- Interpret the prediction with the same caution applied to any uncontrolled-entry forecast: it is a model updated from tracking data, not a precise impact appointment.
Readers who simply want to know whether a re-entry may be visible near home will usually find ESA’s public portal easier to understand. Space-Track becomes valuable when the question involves catalog identifiers, orbital elements, data downloads or independent technical analysis.
Heavens-Above and ISS Detector for broader pass watching
An independent comparison identifies Heavens-Above as a strong all-around prediction tool and ISS Detector as a convenient mobile option for pass notifications. They are useful when the target is a satellite pass rather than a launch or re-entry, particularly if you want to browse objects beyond the ISS.
Because app features, operating-system support and notification policies can change, verify the current listing before installing either service. Treat their pass times as predictions that depend on your selected location and the quality of the underlying orbital data. For an official ISS-specific alert, NASA Spot the Station remains the more direct choice.
Is there one app for launches, passes and re-entries?
Not reliably. The data problems are different:
- A launch calendar follows planned events and must react quickly to postponements.
- A visible-pass service calculates when an orbit crosses an observer’s horizon and whether lighting conditions make the object visible.
- A re-entry service models atmospheric decay and communicates uncertainty over a changing window and footprint.
A practical combination is Spot the Station for ISS passes, Space Launch Now for launch schedules and ESA’s portal for re-entries. Add Space-Track only when you need technical orbital or decay products. This small set avoids forcing one general-purpose app to solve three incompatible alert problems.
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No ISS alert arrived
- Confirm that the app still has notification permission in the operating system.
- Check that the selected location is correct and that the app is not limited by a battery-saver or background-data setting.
- Open the schedule manually. A pass may have poor visibility conditions or may not meet the app’s notification criteria.
- Update the app and operating system, then re-check notification settings after an update.
A launch time changed
- Refresh the Space Launch Now calendar and read the mission’s latest status.
- Check the launch provider’s current announcement, especially for weather or range holds.
- Keep alerts enabled for schedule changes rather than relying on the original countdown.
A re-entry map looks precise
- Read the time window and uncertainty information before interpreting the map.
- Remember that a ground track is a corridor of possible flight, not an exact impact coordinate.
- Return to ESA’s portal as new tracking information is posted; early maps can change materially.
You need an alert for a different satellite
Spot the Station is dedicated to the ISS. Use a general pass predictor for visibility of other satellites, or consult ESA’s re-entry portal if the event is an atmospheric return rather than an orbiting pass.
Best choice by reader goal
| Your goal | Best starting point | Reason |
|---|---|---|
| Receive a notification before the ISS passes overhead | NASA Spot the Station | Official NASA app with location-specific schedules, visibility information and push notifications on iOS and Android. |
| Follow launches from many countries and agencies | Space Launch Now | Broad calendar with countdowns, mission data and alerts covering major providers. |
| Check whether a satellite or rocket body may re-enter | ESA re-entry predictions portal | Specialist predictions that are revised as tracking data changes; free registration is required. |
| Download or analyze decay and orbital products | Space-Track.org | Technical catalog, orbital-element and decay/re-entry products for registered users. |
| Browse passes for many satellites | Heavens-Above or ISS Detector | Independent comparison identifies them as useful general or mobile pass-prediction options; verify current features first. |
Bottom line
Match the tool to the event. NASA Spot the Station is the authoritative, location-aware answer for ISS flyover alerts. Space Launch Now is the most convenient broad launch calendar in this set, but launch times remain changeable. ESA’s re-entry portal is the right public source for satellite and rocket-body return predictions, provided you understand that its windows and footprints are estimates that narrow with better tracking. Space-Track.org is the deeper technical option for registered users, while Heavens-Above and ISS Detector are useful supplements for general satellite-pass watching.
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