T.S. Kelso (@tskelso.bsky.social)

T.S. Kelso

@tskelso.bsky.social

Operator of CelesTrak, the world's first source for orbital element sets and related software and educational materials.

719 followers 14 following976 posts

T.S. Kelso

@tskelso.bsky.social

CelesTrak has GP data for 4 of 10 objects from the launch (2026-243) of 9 GuoWang satellites atop a Long March-8A rocket from Wenchang Space Launch Site on Oct 25 at 0203 UTC: www.china-in-space.com/p/wenchang-h.... Data for the launch can be found at: celestrak.org/NORAD/elemen....

T.S. Kelso

@tskelso.bsky.social

CelesTrak has GP data for 2 of 7 objects from the launch (2026-241) of Yaogan-53 (07-09) & Yaogan-56 (19-21) atop a Long March-4B rocket from Jiuquan Satellite Launch Center on Oct 23 at 1925 UTC: www.china-in-space.com/p/another-si.... Data can be found at: celestrak.org/NORAD/elemen....

T.S. Kelso

@tskelso.bsky.social

CelesTrak has ephemeris-based SupGP data for 26 of 27 satellites from the Starlink G15-15 launch (2026-242) atop a Falcon 9 rocket from Vandenberg SFB on 2026-10-23 at 22:48:44 UTC: spaceflightnow.com/2026/10/20/l.... Data for the launch can be found at: celestrak.org/NORAD/elemen....

T.S. Kelso

@tskelso.bsky.social

CelesTrak has GP data for 2 objects from the launch (2026-240) of Yaogan-50 03 atop a Long March-6A rocket from Taiyuan Satellite Launch Center on Oct 23 at 1015 UTC: www.china-in-space.com/p/third-retr.... Data for the launch can be found at: celestrak.org/NORAD/elemen....

T.S. Kelso

@tskelso.bsky.social

CelesTrak has GP data for 5 objects from the launch (2026-239) of HawkEye 360 Cluster 16 atop an Electron rocket from Māhia Peninsula, NZ on Oct 23 at 0711 UTC: www.he360.com/hawkeye-360-.... Data for the launch can be found at: celestrak.org/NORAD/elemen....

T.S. Kelso

@tskelso.bsky.social

You may have noticed that while CelesTrak is up, it has not updated since ~1700 UTC. That appears to be the result of our hosting provider turning off all access ~0900 UTC in response to a major PHP vulnerability. Not only can't we get in to update PHP, all of our auto-processing is now shut down.

T.S. Kelso

@tskelso.bsky.social

After getting to bed at 0300 HST, getting a couple of hours of sleep, then checking all processes were running normally, the SATCAT is fully updated & we're caught up on launch notifications (with 3 more in the works) & everything looks good. I'm getting too old for these (almost) all-nighters...

T.S. Kelso

@tskelso.bsky.social

CelesTrak has GP data for 1 object from the launch (2026-238) of Xiguang-4 01, atop a Ceres-1S rocket from the Yellow Sea Launch Area on Oct 21 at 0339 UTC: www.china-in-space.com/p/guangzhou-.... Data for the launch can be found at: celestrak.org/NORAD/elemen....

T.S. Kelso

@tskelso.bsky.social

CelesTrak has post-deployment SupGP data for the #Bandwagon-5 launch from Cape Canaveral on 2026-10-20 at 11:04:00.123 UTC: celestrak.org/NORAD/elemen.... Deployment of 31 satellites occurred 2026-10-20 12:01:18.043 UTC until 2026-10-20 12:13:29.143 UTC: spaceflightnow.com/2026/10/18/l....

T.S. Kelso

@tskelso.bsky.social

Since we have GP data so soon after deployment, we can match the post-deployment SupGP data vs. the GP data. Note that there are many good matches, but not all are unique. The Pelican-12 post-deployment supports our ID based on the ephemeris-based SupGP using Planet's data. A good starting point!

T.S. Kelso

@tskelso.bsky.social

The URL for these matching results is: celestrak.org/NORAD/elemen....

SupGP Matching shows Pelican-12 is SSC 101128/2026-237T: celestrak.org/NORAD/elemen....

CelesTrak now has GP data for 31 objects from the Bandwagon-5 launch. Data can be found at: celestrak.org/NORAD/elemen....

T.S. Kelso

@tskelso.bsky.social

18 SDS has cataloged 2 objects from the launch (2026-236) of Martian Moons eXploration (MMX) atop an H3 rocket from Tanegashima Space Center on Oct 19 at 1941 UTC: www.japantimes.co.jp/news/2026/10.... SATCAT data can be found at: celestrak.org/satcat/table....

We finally have a status update from Hostwinds. I have requested immediate restoration of access to allow us to restore CelesTrak's services in support of safety of flight. Stay tuned and follow here for more.

T.S. Kelso

@tskelso.bsky.social

CelesTrak was patched and brought back online several hours ago. Getting all of the data updated will take a while. GP, SATCAT, EOP, and space weather have been updated. Cybersecurity processed ~900 malicious/abusive IP addresses into the firewall in ~1.5 minutes. SupGP will take more time.

We finally have access to the CelesTrak servers. We have taken CelesTrak offline and are working the recovery. We will let you know when everything is back online.

Users should expect that we will need to take CelesTrak offline temporarily to review system status, apply security updates, and restart processes. We will advise when that is about to start.

We are 24 hours into this mess & Hostwinds has yet to provide any details or timeline for recovery, despite this initial message: "Our team is actively working on this, and we'll share updates here as they become available." We have no way to access CelesTrak, restart processes, or update any data.

T.S. Kelso

@tskelso.bsky.social

CelesTrak has pre-launch SupGP data for the #Bandwagon-5 launch from Cape Canaveral on 2026-10-19 at 10:29:59.990 UTC: celestrak.org/NORAD/elemen.... Deployment of 31 satellites is set to occur 2026-10-19 11:27:18.390 UTC until 2026-10-19 11:39:29.490 UTC.

T.S. Kelso

@tskelso.bsky.social

Data has been updated to reflect a new launch date of 2026-10-20.

T.S. Kelso

@tskelso.bsky.social

CelesTrak has GP data for 11 objects from the launch (2026-234) of 8 Three-Body Computing & Guangchuan-03/04 atop a Zhuque-2E rocket from Jiuquan Satellite Launch Center on Oct 14 at 1140 UTC: www.china-in-space.com/p/three-body.... Data for the launch can be found at: celestrak.org/NORAD/elemen...

T.S. Kelso

@tskelso.bsky.social

CelesTrak has GP data for 1 object from the launch (2026-233) of Dragon CRS-35 to the ISS atop a Falcon 9 rocket from Cape Canaveral on Oct 13 at 1033 UTC: spaceflightnow.com/2026/10/13/s.... Data for the launch can be found at: celestrak.org/NORAD/elemen....

T.S. Kelso

@tskelso.bsky.social

CelesTrak has GP data for 21 objects from the launch (2026-231) of Tranche 1 Transport Layer A atop a Falcon 9 rocket from Vandenberg SFB on Oct 10 at 0739 UTC: spaceflightnow.com/2026/10/09/s.... Data for the launch can be found at: celestrak.org/NORAD/elemen....

T.S. Kelso

@tskelso.bsky.social

CelesTrak has ephemeris-based SupGP data for all 27 satellites from the Starlink G15-25 launch (2026-232) atop a Falcon 9 rocket from Vandenberg SFB on 2026-10-13 at 00:28:11 UTC: spaceflightnow.com/2026/10/12/s.... Data for the launch can be found at: celestrak.org/NORAD/elemen....

T.S. Kelso

@tskelso.bsky.social

The latest Announcement of DUT1 from IERS: hpiers.obspm.fr/iers/bul/bul....

T.S. Kelso

@tskelso.bsky.social

Every one of these Galileo and GPS satellites has SupGP data less than a day old (Page 2): celestrak.org/NORAD/elemen.... Often from multiple sources: celestrak.org/NORAD/elemen.... And they are all in agreement: celestrak.org/NORAD/elemen.... Yet we see: celestrak.org/NORAD/elemen....

CelesTrak has GP data for 10 objects from the launch (2026-230) of 9 GuoWang satellites atop a Long March-12 rocket from Wenchang Space Launch Site on Oct 9 at 1927 UTC: www.china-in-space.com/p/further-gu.... Data for the launch can be found at: celestrak.org/NORAD/elemen....

T.S. Kelso

@tskelso.bsky.social

CelesTrak has GP data for 15 objects from the launch (2026-229) of NEONSAT-2 thru -6 plus 10 cubesats atop a KSLV-2 rocket from Naro Space Center on Oct 7 at 0325 UTC: www.aa.com.tr/en/asia-paci.... Data for the launch can be found at: celestrak.org/NORAD/elemen....

T.S. Kelso

@tskelso.bsky.social

GPS We continue to see these kinds of mismatches: celestrak.org/NORAD/elemen..., despite the information on forecast delta-Vs (FCSTDV) and summaries (FCSTSUMM) being provided in NANUs by 2NWS (GPS Operations): celestrak.org/GPS/NANU/202....

T.S. Kelso

@tskelso.bsky.social

CelesTrak has 18 SDS GP data for 71 objects from the Transporter-18 launch on Oct 1: celestrak.org/NORAD/elemen.... We have already positively matched 4 Planet satellites using their ephemeris-based SupGP data: celestrak.org/NORAD/elemen.... Only 67 more to go!

T.S. Kelso

@tskelso.bsky.social

We have made IDs for 4 more: ERMINAZ-2 (GER), HADES-L (SPN), CRIMSON-1 (SING), and SPRITE (US).

T.S. Kelso

@tskelso.bsky.social

18 SDS has cataloged 1 object from the launch (2026-228) of NROL-97 atop a Falcon Heavy rocket from Cape Canaveral on Oct 2 at 0354 UTC: spaceflightnow.com/2026/10/01/f.... SATCAT data can be found at: celestrak.org/satcat/table....

T.S. Kelso

@tskelso.bsky.social

18 SDS has just cataloged 23 objects from the launch (2026-224) of USSF-385 atop a Falcon 9 rocket from Vandenberg SFB on Sep 26 at 1400 UTC: spaceflightnow.com/2026/09/25/s.... SATCAT data can be found at: celestrak.org/satcat/table....

T.S. Kelso

@tskelso.bsky.social

CelesTrak has GP data for 1 object from the launch (2026-226) of Crew Dragon 13 atop a Falcon 9 rocket from Cape Canaveral on Oct 1 at 1510 UTC: www.nasa.gov/blogs/spaces.... See more at: www.nasa.gov/mission/nasa.... Data for the launch can be found at: celestrak.org/NORAD/elemen.... Now docked.

T.S. Kelso

@tskelso.bsky.social

CelesTrak has post-deployment SupGP data for the #Transporter-18 launch from Vandenberg SFB on 2026-10-01 at 18:32:00.103 UTC: celestrak.org/NORAD/elemen.... Deployment of 69 satellites occurred 2026-10-01 19:26:17.523 UTC until 2026-10-01 19:37:10.623 UTC.

T.S. Kelso

@tskelso.bsky.social

18 SDS has cataloged 17 objects from the launch (2026-214) of USSF-259 atop a Falcon 9 rocket from Vandenberg SFB on Sep 17 at 0107 UTC: spaceflightnow.com/2026/09/15/l.... SATCAT data can be found at: celestrak.org/satcat/table....

T.S. Kelso

@tskelso.bsky.social

CelesTrak has pre-launch SupGP data for the #Transporter-18 launch from Vandenberg SFB on 2026-10-01 at 18:17:59.990 UTC: celestrak.org/NORAD/elemen.... Deployment of 70 satellites is set to occur 2026-10-01 19:12:24.250 UTC until 2026-10-01 19:23:17.350 UTC.

T.S. Kelso

@tskelso.bsky.social

CelesTrak has ephemeris-based SupGP data for all 26 satellites from the Starlink G31-1 launch (2026-225) atop a Starship rocket from Starbase on 2026-09-28 at 12:48:59 UTC: spaceflightnow.com/2026/09/28/s.... Data for the launch can be found at: celestrak.org/NORAD/elemen....

T.S. Kelso

@tskelso.bsky.social

Sorry for the delays in getting this data out, as we are continuing to work with SpaceX to automate this processing. As a consolation, here's a cool bonus view of the last Starlink satellite being deployed, as seen from the 25th deployment.

T.S. Kelso

@tskelso.bsky.social

CelesTrak has GP data for 3 objects from the launch (2026-223) of StriX-11 atop an Electron rocket from Māhia Peninsula, NZ on Sep 26 at 0039 UTC: rocketlabcorp.com/updates/miss.... Data for the launch can be found at: celestrak.org/NORAD/elemen....

T.S. Kelso

@tskelso.bsky.social

CelesTrak has GP data for 1 of 6 objects from the launch (2026-222) of 3 Yaogan-40 Group 04 satellites atop a Long March-6A rocket from Taiyuan Satellite Launch Center on Sep 24 at 0846 UTC: www.china-in-space.com/p/fourth-yao.... Data for the launch can be found at: celestrak.org/NORAD/elemen....

T.S. Kelso

@tskelso.bsky.social

CelesTrak has GP data for 11 objects from the launch (2026-221) of 9 Guowang satellites atop a Long March-8A rocket from Wenchang Space Launch Site on Sep 23 at 1332 UTC: www.china-in-space.com/p/guowang-ex.... Data for the launch can be found at: celestrak.org/NORAD/elemen....

T.S. Kelso

@tskelso.bsky.social

20 Sept

CelesTrak has GP data for 6 of 10 objects from the launch (2026-220) of Chaozhisuan-1 plus 8 other satellites atop a Lijian-1 rocket from Jiuquan Satellite Launch Center on Sep 20 at 0403 UTC: www.china-in-space.com/p/new-orbita.... Data for the launch can be found at: celestrak.org/NORAD/elemen....