ISS & Satellite Pass Tracker

ISS & Satellite Pass Tracker | Online Free Tool | Elysia Tools

Tool usage guide

Learn when to use this tool, what it supports, and how real users apply it.

Key facts

Category: Astronomy
Input types: number, date, select
Output type: json
Sample coverage: 4
API ready: Yes

Overview

Predict upcoming passes of the International Space Station (ISS), Hubble Space Telescope, and Starlink satellites for any location on Earth. Using live Two-Line Element (TLE) data and SGP4 orbital propagation, this tool calculates precise pass times, peak elevation angles, and durations to help you plan your night sky observations.

When to use

When planning backyard astronomy sessions and wanting to spot the ISS or Hubble Space Telescope with the naked eye.
When tracking representative Starlink satellite passes over a specific geographic coordinate.
When setting up astrophotography equipment and needing to know when satellites will cross your field of view.

How it works

1Input your observing location's latitude and longitude coordinates along with the target date.
2Select your satellite preset (ISS, Hubble, Starlink, or all common) and set a minimum elevation threshold to filter out low-horizon passes.
3The tool processes live TLE orbital data using SGP4 propagation to calculate the exact pass times and peak elevations relative to your location.

Use cases

Finding the best time to view and photograph the ISS passing directly overhead.
Filtering out low-altitude satellite passes to focus only on high-elevation, clear-sky viewing opportunities.
Coordinating local astronomy club viewing events by exporting precise pass times for a specific date and coordinate.

Examples

1. Spotting the ISS over New York City

Amateur Astronomer

Background

An amateur astronomer in New York wants to show their family the ISS passing overhead but needs to know exactly when and where to look.

Problem

Needs to find high-elevation ISS passes for a specific evening without sorting through unrelated satellite data.

How to use

Enter latitude 40.7128 and longitude -74.006 for New York, select the 'ISS' preset, set the minimum elevation to 15 degrees, and set the UTC offset to -4 for local time.

{
  "latitude": 40.7128,
  "longitude": -74.006,
  "date": "2026-06-16",
  "satellitePreset": "iss",
  "minElevationDeg": 15,
  "utcOffsetHours": -4
}

Outcome

Returns a list of ISS passes, showing a peak elevation of 64.2 degrees, making it highly visible above the city skyline.

2. Planning a Starlink and Hubble Observation in London

Astrophotographer

Background

A photographer in London wants to capture long-exposure shots of both Hubble and Starlink satellites on a clear summer night.

Problem

Needs to coordinate camera angles based on the peak elevation of multiple satellites on the same night.

FAQ

What satellites can I track with this tool?

You can track the International Space Station (ISS), the Hubble Space Telescope, and representative Starlink satellites.

What is the minimum elevation setting used for?

It filters out passes that do not rise above a certain angle, helping you ignore passes blocked by local obstructions like trees or buildings.

How does the tool calculate the satellite passes?

It uses live Two-Line Element (TLE) data combined with the SGP4 orbital propagation model to compute coordinates relative to your observer location.

Do I need to adjust the UTC offset?

Yes, entering your local UTC offset ensures the predicted pass times are displayed in your local time zone rather than UTC.

Can I track satellites during the daytime?

Yes, the tool calculates all physical passes, though optical visibility to the naked eye depends on local daylight and lighting conditions.

{
  "latitude": 51.5074,
  "longitude": -0.1278,
  "date": "2026-06-16",
  "satellitePreset": "all-common",
  "minElevationDeg": 10,
  "utcOffsetHours": 1
}

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Learn when to use this tool, what it supports, and how real users apply it.

Key facts

Overview

When to use

How it works

Use cases

Examples

1. Spotting the ISS over New York City

2. Planning a Starlink and Hubble Observation in London

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