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A free scan shows the junk files, broken settings and background clutter dragging Windows down - then fixes them in one click.Free scan · Windows 10 & 11Use a location-based satellite pass predictor, but first confirm the new object has an identity and usable orbital data. Search by its name or catalog number, set your observing location and local time zone, and choose a prediction window. If it has just launched and does not appear, look for the launch batch or post-deployment orbital data and try again later. A calculated pass means the satellite is predicted to travel over your location; it does not guarantee you will see it.
Find the satellite’s identity and orbital data
A rocket can deploy several objects, and a newly released satellite may not yet have its final name or catalog entry. Launch, deployment, orbital-data availability, cataloging and final identification are separate milestones. A failed search immediately after launch does not mean the satellite has no future passes.
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- Identify the launch or deployment batch. Check which objects the launch released and whether the satellite has a confirmed name or catalog number. CelesTrak notes that gaps in its Satellite Catalog (SATCAT) can be associated with recent launches whose objects have not yet been cataloged.
- Look for orbital elements. Check the Current Supplemental GP Element Sets for operator-derived or post-deployment data. Supplemental sets cover selected objects, not every satellite or launch.
- Check back if data is missing or changes. The predicted pass depends on the available orbit and its timestamp. For recently launched objects, both the orbit and the object’s identification may take time to become available or be revised.
There is no fixed wait time that applies to every launch. In a 2017 study of selected 2016 International Space Station deployment cases, CelesTrak reported that almost all in one examined group had delays of one to two days or more between deployment and TLE availability; three listed catalog entries had an individual six-day delay. These are historical examples, not a timetable for current launches. The study explains why launch and deployment do not necessarily make an object immediately trackable: Challenges Identifying Newly Launched Objects.
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1Scan for outdated or missing drivers - takes under a minute2Clear out junk files and repair common Windows errors3Fix the driver behind crashes, sound loss and screen glitchesGet a pass prediction for your location
Once you have a usable orbit and have identified the object, use a satellite tracker that calculates passes for an observer’s location. Enter your location, select the satellite by name or catalog number, set the local time zone and choose the date or prediction window. A predictor propagates the orbital elements and calculates the satellite’s position relative to your location; it is an estimate based on the input orbit, not a direct observation of where the satellite will be. See Satellite.js documentation for an example of SGP4 propagation and observer geometry.
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Read the listing for each pass for the local start time, direction or sky path, maximum elevation and duration where available. A higher pass is generally easier to follow than one near the horizon, but a geometric pass alone says nothing certain about whether the spacecraft will be visible to the naked eye.
Check whether the pass could be visible
For a visual sighting, the sky needs to be dark enough while the satellite is still illuminated by the Sun and reflecting sunlight. That combination often occurs around dusk or dawn. A tracker that labels pass points by sky darkness and satellite lighting can help distinguish a useful viewing opportunity from a pass that is only geometrically overhead; Sat-above describes this distinction in its About — Satellite Tracker page.
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- Check the pass’s lighting and sky-darkness indication, if the tracker provides one.
- Look toward the predicted direction and keep your view clear of buildings and the horizon.
- Allow for clouds, the satellite’s brightness and changes to its orbital data; each can affect whether the pass is visible or easy to spot.
Check the tracker’s data format for very new objects
As of CelesTrak’s notice checked for this article, the five-digit catalog-number limit was reached on July 11, 2026. CelesTrak says newly cataloged objects receive six-digit catalog numbers and their GP data are not available in legacy TLE format. If your tracker or workflow relies on legacy TLE files, it may not support those objects; check that it accepts an available current format. CelesTrak recommends OMM options for forward-compatible GP data use in A New Way to Obtain GP Data (aka TLEs).
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