For the International Space Station (ISS), NASA’s Spot the Station is the simplest way to see where it is and find upcoming viewing opportunities for your location. For other objects orbiting Earth, use a tracker or orbital-data source that shows how current its data is. For selected spacecraft beyond Earth orbit, use JPL Horizons; its trajectories are calculated ephemeris data, not a live GPS-style feed.
How do I track a satellite in real time?
Choose the service based on what you want to track and what you need to know: a map position, a visible pass from your location, orbital data to download, or coordinates for a spacecraft beyond Earth. “Real time” often describes a position calculated and displayed using available data; it does not mean the satellite is broadcasting its position live to the app.
| What you want to track | Best starting point | Useful for |
|---|---|---|
| International Space Station | NASA Spot the Station | ISS location, local viewing schedules, and alerts |
| Other Earth-orbiting objects | CelesTrak GP data or a tracker that identifies its orbital-data source and age | Orbital elements and calculated positions for cataloged objects |
| Selected spacecraft beyond Earth orbit | JPL Horizons | Ephemerides, viewing coordinates, vectors, or orbital elements for supported targets |
How can I see when the ISS will pass over my house?
- Open NASA’s Spot the Station website or app.
- Enter or select your observing location to see upcoming viewing opportunities and, where available, set alerts.
- Check the listed pass details and local conditions before going outside. A predicted pass does not guarantee the ISS will be visible from your exact spot; clouds, daylight, obstructions, and the pass geometry matter.
NASA says the ISS completes about 16 orbits each day and has a 51.6° orbital inclination. Those describe its orbit, not whether a particular pass will be visible from your location.
How do I track another satellite orbiting Earth?
Find the object and check its orbital data
Identify the satellite by name or catalog number in a tracker or orbital catalog. If you are using a tracker, look for the data source and the age or epoch of the orbital elements behind its position. CelesTrak publishes general perturbations (GP) element sets in several formats and provides data-age information on its Space Stations page. NASA’s Open APIs TLE API page says its records are updated daily from CelesTrak.
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Do not assume every tracker supports every object or data format. CelesTrak warns that the USSF catalog exceeded the five-digit range in July 2026; new six-digit catalog numbers cannot be represented in legacy TLE format. Its GP data page points users to formats without that limit, including OMM variants. Check the current GP Element Sets page when choosing data for a newer object.
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For Earth-orbiting objects, positions are commonly calculated from orbital element sets. Their age matters: a fresh-looking map display cannot make stale input data current. This is especially important for low Earth orbit (LEO). JPL warns that forecasts more than a few days ahead may be wrong by tens or hundreds of kilometers, particularly when a TLE-based prediction does not account for maneuvers.
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How to choose a tracker
Before relying on a service, check these details:
- Target coverage: Does it support only the ISS, a selection of satellites, a broad Earth-orbit catalog, or the spacecraft you want beyond Earth?
- Task: Do you need a live-style map, a next visible pass, alerts, sky coordinates, downloadable orbital data, or programmatic ephemerides?
- Location: Can you enter your observing location and get local pass opportunities?
- Data provenance and age: Does the service identify the source, element-set epoch, trajectory revision date, or update cadence?
- Format and effort: Is a simple app or website enough, or do you need to work with orbital data or an API?
For ISS viewing, start with NASA Spot the Station. For Earth-orbit data, CelesTrak is a source of GP elements and format information. For supported solar-system objects and spacecraft, JPL Horizons provides ephemeris access through multiple interfaces described on its overview page.
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