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CelesTrack
CelesTrak is a nonprofit organization with a mission related to space and satellite information.
About CelesTrack
CelesTrak is a 501(c)(3) nonprofit that makes satellite orbital data and related resources freely available to the space community. It provides NORAD GP element sets, supplemental data, an online satellite catalog with boxscores, conjunction reports, GPS messages and almanacs, earth orientation and space weather data, and a library with publications, software and orbital mechanics tutorials.
GP data for newly cataloged objects with 6-digit catalog numbers of 100000 and above is not available using the TLE format, so users need to use CelesTrak's other formats. Retrieval of CelesTrak data is subject to its usage policy.
Key features
- Current NORAD GP element sets and supplemental SupGP data
- Online satellite catalog with boxscore and launch boxscore
- Satellite conjunction reports via SOCRATES Plus
- GPS status messages, NANUs, SEM and Yuma almanacs
- Earth orientation parameters and space weather data
- Library with publications, software repository and orbital mechanics tutorials
Best for: Members of the space community who need freely available satellite orbital data and catalogs.
Good for
- Data and other resources made freely available to the space community
- Covers GP data, catalogs, conjunction reports, GPS data and space data
- Provides tutorials on obtaining GP data and performing SupGP queries
Watch out for
- TLE format cannot provide GP data for objects with catalog numbers 100000 and above
- Retrieving data requires adherence to the CelesTrak usage policy
CelesTrack at a glance
- Website
- celestrak.org
- Category
- Education & Learning › Space & Astronomy
- Type
- Website
- Pricing
- Not confirmed. Check the site
- Platforms
- Web
- Open source
- Not stated
- Last checked
- Oct 5, 2026 · Online when checked
- Listed
- Oct 5, 2026
CelesTrack alternatives
Tools and sites you could use instead, ranked by how closely they match.
Look4Sat provides an Android satellite tracker and pass predictor, with information sourced from Celestrak.
Open source
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CelesTrack FAQ
Why is GP data unavailable in TLE format for some newly cataloged objects?
CelesTrak states 5-digit catalog numbers ran out on 2026-07-11 and new objects use 6-digit numbers of 100000 and above, which the TLE format does not support. It advises using its other formats.
Are there rules for retrieving CelesTrak data?
Yes, CelesTrak asks users to adhere to its usage policy when retrieving any CelesTrak data.
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