banner
tskelso.bsky.social
T.S. Kelso
@tskelso.bsky.social
350 followers 13 following 420 posts
Operator of CelesTrak, the world's first source for orbital element sets and related software and educational materials.
Posts Media Videos Starter Packs
Pinned
tskelso.bsky.social
T.S. Kelso @tskelso.bsky.social · Dec 1
In case you missed it, 18 SDS just assigned NORAD Catalog Number 60011. As a reminder, we run out of 5-digit catalog numbers at 70000. CelesTrak will not be supporting Alpha-5, since all standards show these as integers. See celestrak.org/NORAD/docume... to prepare now. [Re-post from X]
5 11
tskelso.bsky.social
T.S. Kelso @tskelso.bsky.social · 8h
CelesTrak has ephemeris-based SupGP data for all 28 satellites from the Starlink G11-17 launch (2025-225) atop a Falcon 9 rocket from Vandenberg SFB on 2025-10-08 at 03:54:00 UTC: spaceflightnow.com/2025/10/07/l.... Data for the launch can be found at: celestrak.org/NORAD/elemen....
tskelso.bsky.social
T.S. Kelso @tskelso.bsky.social · 1d
CelesTrak has ephemeris-based SupGP data for all 28 satellites from the Starlink G10-59 launch (2025-224) atop a Falcon 9 rocket from Cape Canaveral on 2025-10-07 at 06:46:10 UTC: spaceflightnow.com/2025/10/06/l.... Data for the launch can be found at: celestrak.org/NORAD/elemen....
1
tskelso.bsky.social
T.S. Kelso @tskelso.bsky.social · 5d
CelesTrak has ephemeris-based SupGP data for all 28 satellites from the Starlink G11-39 launch (2025-223) atop a Falcon 9 rocket from Vandenberg SFB on 2025-10-03 at 14:06:50 UTC: spaceflightnow.com/2025/10/02/l.... Data for the launch can be found at: celestrak.org/NORAD/elemen....
2
tskelso.bsky.social
T.S. Kelso @tskelso.bsky.social · 7d
CelesTrak has GP data for 3 objects from the launch (2025-222) of Shiyan-30 01 & 02 atop a Long March-2D rocket from Xichang Satellite Launch Center on Sep 29 at 0300 UTC: www.china-in-space.com/p/100th-long.... Data for the launch can be found at: celestrak.org/NORAD/elemen....
1
tskelso.bsky.social
T.S. Kelso @tskelso.bsky.social · 7d
18 SDS has cataloged 8 objects from the launch (2025-213) of NROL-48 atop a Falcon 9 rocket from Vandenberg SFB on Sep 22 at 1738 UTC: spaceflightnow.com/2025/09/22/l.... SATCAT data can be found at: celestrak.org/satcat/table... (GP data, if available, at celestrak.org/NORAD/elemen...).
1
tskelso.bsky.social
T.S. Kelso @tskelso.bsky.social · 7d
You can find the link to our paper and presentation at IAC 2025 on CelesTrak at: celestrak.org/publications.... Please let me know if you have any questions.
1 2
tskelso.bsky.social
T.S. Kelso @tskelso.bsky.social · 9d
CelesTrak has ephemeris-based SupGP data for all 28 satellites from the Starlink G11-20 launch (2025-221) atop a Falcon 9 rocket from Vandenberg SFB on 2025-09-29 at 02:04:50 UTC: spaceflightnow.com/2025/09/28/l.... Data for the launch can be found at: celestrak.org/NORAD/elemen....
1
tskelso.bsky.social
T.S. Kelso @tskelso.bsky.social · 10d
CelesTrak has GP data for 6 objects from the launch (2025-220) of Hulianwang Digui Group 11 atop a Long March-6A rocket from Taiyuan Satellite Launch Center on Sep 27 at 1240 UTC: www.china-in-space.com/p/guowang-gr.... Data for the launch can be found at: celestrak.org/NORAD/elemen....
1
tskelso.bsky.social
T.S. Kelso @tskelso.bsky.social · 11d
CelesTrak has GP data for 2 objects from the launch (2025-219) of Fengyun 3H atop a Long March-4C rocket from Jiuquan Satellite Launch Center on Sep 26 at 1928 UTC: www.china-in-space.com/p/night-laun.... Data for the launch can be found at: celestrak.org/NORAD/elemen....
3
tskelso.bsky.social
T.S. Kelso @tskelso.bsky.social · 12d
CelesTrak has ephemeris-based SupGP data for all 24 satellites from the Starlink G17-11 launch (2025-218) atop a Falcon 9 rocket from Vandenberg SFB on 2025-09-26 at 04:26:29 UTC: spaceflightnow.com/2025/09/25/l.... Data for the launch can be found at: celestrak.org/NORAD/elemen....
1
tskelso.bsky.social
T.S. Kelso @tskelso.bsky.social · 13d
Update performed on my iPad using Starlink on Hawaiian Airlines flight over the Pacific Ocean from Honolulu to Sydney.
1
tskelso.bsky.social
T.S. Kelso @tskelso.bsky.social · 13d
CelesTrak has ephemeris-based SupGP data for all 28 satellites from the Starlink G10-15 launch (2025-216) atop a Falcon 9 rocket from Cape Canaveral on 2025-09-25 at 08:39:00 UTC: spaceflightnow.com/2025/09/25/l.... Data for the launch can be found at: celestrak.org/NORAD/elemen....
1 1
tskelso.bsky.social
T.S. Kelso @tskelso.bsky.social · 13d
CelesTrak has ephemeris-based SupGP data for all 27 satellites from the launch (2025-217) of Kuiper (KA-03) atop an Atlas V rocket from Cape Canaveral on Sep 25 at 1209 UTC: spaceflightnow.com/2025/09/25/l.... Data for the launch can be found at: celestrak.org/NORAD/elemen....
1
tskelso.bsky.social
T.S. Kelso @tskelso.bsky.social · 13d
CelesTrak has GP data for 4 objects from the launch (2025-215) of IMAP, SWFO-L1, & CARRUTHERS atop a Falcon 9 rocket from Cape Canaveral on Sep 24 at 1130 UTC: spaceflightnow.com/2025/09/24/l.... Data for the launch can be found at: celestrak.org/NORAD/elemen....
tskelso.bsky.social
T.S. Kelso @tskelso.bsky.social · 13d
CelesTrak has GP data for 11 of 12+ objects from the launch (2025-214) of GEESAT Group 06 atop a Jielong-3 rocket from the waters off Shandong Province on Sep 24 at 0756 UTC: www.china-in-space.com/p/geespace-l.... Data for the launch can be found at: celestrak.org/NORAD/elemen....
1
tskelso.bsky.social
T.S. Kelso @tskelso.bsky.social · 14d
If you're attending IAC 2025 in Sydney next week, join me for our paper "Understanding and Mitigating Data Limitations for Conjunction Assessments" in Session A6.7 (Room C4.10) on Sep 30 at 1500 AET. Don't miss this frank discussion of the challenges we all face performing CA every day!
1 1 4
tskelso.bsky.social
T.S. Kelso @tskelso.bsky.social · 14d
CelesTrak has GP data for 21 objects from the launch (2025-203) of 21 Tranche 1 Transport Layer B satellites atop a Falcon 9 rocket from Vandenberg SFB on Sep 10 at 1412 UTC: spaceflightnow.com/2025/09/12/n.... Data for the launch can be found at: celestrak.org/NORAD/elemen....
1
tskelso.bsky.social
T.S. Kelso @tskelso.bsky.social · 16d
6/ Finally, please remember we will almost certainly run out of 5-digit catalog numbers (at 70000 not 100000) before summer 2026. Be sure to read all of the documentation, adapt your code to use one of the new formats (we use CSV), and make sure your software providers do, too. And spread the word!
1 3
tskelso.bsky.social
T.S. Kelso @tskelso.bsky.social · 16d
5/ And there are all sorts of useful suggestions in our documentation for how to help CelesTrak continue to support the hundreds of thousands of unique IP addresses we see each day. Please take some time to read it at celestrak.org/NORAD/docume... and adapt your code.
tskelso.bsky.social
T.S. Kelso @tskelso.bsky.social · 16d
4/ Additionally, if you are using code that doesn’t check for errors, that only makes things worse. Today, we sent 20,553 HTTP 503 errors, but that didn’t slow down the onslaught of users trying to get data. Check for errors and try back later to help us out.
tskelso.bsky.social
T.S. Kelso @tskelso.bsky.social · 16d
3/ We see millions of unique IP addresses each month (4.9M in Aug) & just $1/year from most users would allow me to hire & train staff to reduce the likelihood of another extended outage. Until then, all operating costs (servers) & work (both orbital analysis & computer admin) is being done by me.
tskelso.bsky.social
T.S. Kelso @tskelso.bsky.social · 16d
2/ Since very few users donate so that we can hire permanent staff, if this happens while I am sleeping (yes, I do need to sleep) or am otherwise away from the computer, there is nobody else to resolve these issues.
1
tskelso.bsky.social
T.S. Kelso @tskelso.bsky.social · 16d
1/ If you noticed CelesTrak was not available for several hours today, it was because some inconsiderate user or search/AI bot was hammering the site and rotating IP addresses to try to circumvent our cybersecurity protocols. That little stunt impacted tens of thousands of users.
5 1 6
tskelso.bsky.social
T.S. Kelso @tskelso.bsky.social · 17d
CelesTrak has ephemeris-based SupGP data for all 28 satellites from the Starlink G10-27 launch (2025-212) atop a Falcon 9 rocket from Cape Canaveral on 2025-09-21 at 10:53:00 UTC: spaceflightnow.com/2025/09/20/l.... Data for the launch can be found at: celestrak.org/NORAD/elemen....
3
tskelso.bsky.social
T.S. Kelso @tskelso.bsky.social · 18d
CelesTrak has ephemeris-based SupGP data for all 24 satellites from the Starlink G17-12 launch (2025-211) atop a Falcon 9 rocket from Vandenberg SFB on 2025-09-19 at 16:31:39 UTC: spaceflightnow.com/2025/09/16/l.... Data for the launch can be found at: celestrak.org/NORAD/elemen....