CelesTrak is now a
501(c)(3) non-profit
and we need your help. CelesTrak's mission remains focused on making data
and other resources freely available to the space community to facilitate
understanding of our orbital environment and how to use it safely and
responsibly. We are committed to enhancing our current visualization tools and
upgrading SOCRATES to integrate with those tools. And we hope that many of you,
who share our passion, will be willing to make a small monthly donation to help
us achieve our vision. I look forward to continuing this journey together.
We can't do it without you! Even as little as $1/year helps! ‑ T.S. Kelso
URGENT: We ran out of 5-digit catalog numbers with the addition of Saramago on 2026-07-11.
We had estimated
that to occur around 2026‑07‑12 back on 2026-05-09.
The official USSF SATCAT is now at 100082.
All newly cataloged objects will have 6-digit catalog numbers of 100000+ and GP data will not be available for them using the TLE format.
CelesTrak developed new formats that removed the 5-digit
catalog number limitation (and finally fixed the Y2K problem) in May 2020 and immediately began providing GP data in those formats for software developers.
Please be sure to adhere to our usage policy when retrieving any CelesTrak data.
The same limitations apply to the legacy fixed-field SATCAT.
That legacy format will continue to update but will only contain data for objects with catalog numbers below 70000.
Be sure to follow @TSKelso on Bluesky for the latest updates, tutorials,
and changes as we move forward. Spread the word! ‑ TS
Follow @TSKelso and @CelesTrak on Bluesky