T.S. Kelso

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

[T.S. Kelso @TSKelso]

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 https://t.co/TujSQYVZeU to prepare now.

[T.S. Kelso @TSKelso]

For future updates, please join us at: https://t.co/0Yv0Bvqi84.

[T.S. Kelso @TSKelso]

NOAA is reporting and predicting elevated geomagnetic activity: https://t.co/eH1W7LyuAW.

[T.S. Kelso @TSKelso]

CelesTrak has GP data for 6 objects from the launch (2025-059) of Yunyao-1 43-48 atop a Ceres 1 rocket from Jiuquan Satellite Launch Center on Mar 21 at 1107 UTC: https://t.co/bybtWP7ece. Data for the launch can be found at: https://t.co/WsUUoMSxYH.

[T.S. Kelso @TSKelso]

CelesTrak has ephemeris-based SupGP data for all 23 satellites from the @Starlink Group 12-25 launch (2025-057) atop a Falcon 9 rocket from Cape Canaveral on 2025-03-18 at 19:57:50 UTC: https://t.co/8pnsuwGJXD. Data for the launch can be found at: https://t.co/cd1nnpASxG.

[T.S. Kelso @TSKelso]

@SV2HWM The short answer is that SGP4 overestimates the time to decay by about a factor of 2. I haven't had time to do a quantitative assessment of the actual value, so for now 2 is used, which is particularly useful for situations shown here.

[T.S. Kelso @TSKelso]

CelesTrak has GP data for 7 objects from the launch (2025-056) of 5 Kinéis satellites atop an Electron rocket from Māhia Peninsula, NZ on Mar 18 at 0131 UTC: https://t.co/VlzFwfRrRu. Data for the launch can be found at: https://t.co/kOsPUoMlPI.

[T.S. Kelso @TSKelso]

CelesTrak has GP data for 8 objects from the launch (2025-055) of Yunyao-1 55-60 and AIRSAT 06 & 07 atop a CERES-1 rocket from Jiuquan Satellite Launch Center on Mar 17 at 0807 UTC: https://t.co/sOpQBEuehO. Data for the launch can be found at: https://t.co/jBkcQwcUML.

[T.S. Kelso @TSKelso]

8a/ The saga with GPS PRN 28 continues. While the data 'updated' on Feb 25, the association was obviously incorrect. And today--40 days after it was first lost on Feb 4--the RMS difference is over 2,000 km. For a GPS satellite. https://t.co/FTTVjldyHD

[T.S. Kelso @TSKelso]

1/ Seventeen years ago, in Dec 2007, CelesTrak created SupGP data, specifically to avoid having GPS satellites lost following maneuvers. Yet we have two more GPS satellites not being tracked following maneuvers last week: https://t.co/FTTVjldyHD.

[T.S. Kelso @TSKelso]

8/ And now we have the same thing happening for PRN32, as the problem continues to worsen for PRN02 and PRN28: https://t.co/FTTVjldyHD.

[T.S. Kelso @TSKelso]

The ephemeris for GALAXY 11 (used for SupGP), launched 1999-12-22, has stopped updating after circularizing its orbit well above GEO graveyard altitude o/a 2024-11-25. As it appears to have been decommissioned, the CelesTrak SATCAT has been updated: https://t.co/W2T8AvufRL.

[T.S. Kelso @TSKelso]

CelesTrak has GP data for 3 objects from the launch (2025-054) of 3 Strela satellites (COSMOS 2585-2587) atop an Angara 1.2 rocket from Plesetsk Cosmodrome on Mar 16 at 1050 UTC: https://t.co/K4RY3wmosS. Data for the launch can be found at: https://t.co/pKC1cJqYWZ.

[T.S. Kelso @TSKelso]

CelesTrak has ephemeris-based SupGP data for all 23 satellites from the @Starlink Group 12-16 launch (2025-053) atop a Falcon 9 rocket from Cape Canaveral on 2025-03-15 at 11:35:00 UTC: URL. Data for the launch can be found at: https://t.co/p6x8ZKpWHg.

[T.S. Kelso @TSKelso]

*The launch and deployment times are based on the last data we received from SpaceX. We have received no post-deployment data. All reports show launch was actually at ~0643 UTC, which was inside the 17-minute launch window. I have updated the pre-launch data to assume a launch at that time.

[T.S. Kelso @TSKelso]

CelesTrak has pre-launch SupGP data for the #Transporter-13 launch from Vandenberg SFB on 2025-03-15 at 06:42:59.990 UTC: https://t.co/QgLJU3Wdfq. Deployment of 47 satellites is set to occur 2025-03-15 07:37:16.930 UTC until 2025-03-15 09:05:52.250 UTC.* For more on this launch, see: https://t.co/v9lMX2aJZx.

[T.S. Kelso @TSKelso]

CelesTrak has GP data for 2 objects from the launch (2025-051) of Gaojing-3 02 & Tianyan-23 atop a Long March-2D rocket from Jiuquan Satellite Launch Center on Mar 15 at 0411 UTC: https://t.co/izamxuKY1x. Data for the launch can be found at: https://t.co/qaUrdsHJl1.

[T.S. Kelso @TSKelso]

CelesTrak has GP data for 3 objects from the launch (2025-050) of QPS-SAR-9 atop an Electron rocket from Māhia Peninsula, NZ on Mar 15 at 0000 UTC: https://t.co/RAYADMF5wx. Data for the launch can be found at: https://t.co/IurDiFGq9G.

[T.S. Kelso @TSKelso]

CelesTrak has GP data for 1 object from the launch (2025-049) of Crew Dragon 10 atop a Falcon 9 rocket from Cape Canaveral on Mar 14 at 2303 UTC: https://t.co/geLxxmKA7L. Data for the launch can be found at: https://t.co/5AEkQjaMBb.

[T.S. Kelso @TSKelso]

CelesTrak has ephemeris-based SupGP data for all 21 satellites from the @Starlink Group 12-21 launch (2025-048) atop a Falcon 9 rocket from Cape Canaveral on 2025-03-13 at 02:35:30 UTC: https://t.co/3ae9nX5B6F. Data for the launch can be found at: https://t.co/oD07lNlI7K.

[T.S. Kelso @TSKelso]

CelesTrak has GP data for 5 objects from the launch (2025-047) of SPHEREx & PUNCH atop a Falcon 9 rocket from Vandenberg SFB on Mar 12 at 0310 UTC: https://t.co/XzTktDQQAk. Data for the launch can be found at: https://t.co/Xe8caPzC0a.

[T.S. Kelso @TSKelso]

CelesTrak has GP data for 1 object from the launch (2025-045 not -046) of TJS-15 atop a Long March-3B rocket from Xichang Satellite Launch Center on Mar 9 at 1717 UTC: https://t.co/gJoQwRcRTS. Data for the launch can be found at: https://t.co/WsMOHcbj4J.

[T.S. Kelso @TSKelso]

18 SDS has cataloged 1 object from the launch (2025-044) of CSO-3 atop an Ariane 6 rocket from Guiana Space Centre on Mar 6 at 1624 UTC: https://t.co/M8pk4BIP43. If data becomes available, it can be found at: https://t.co/OtUQaD8XzV.