We are delighted to announce that Dr. Thomas Schildknecht is the winner of this year's T.S. Kelso Space Safety award! We would like to congratulate Dr. Schildknecht on this award and his incredible achievements in the field of SSA.

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: spaceflightnow.com/2025/03/10/liv…. Data for the launch can be found a…

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: spacenews.com/crew-10-launch…. Data for the launch can be found at: celestrak.org/NORAD/elements….

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: spacenews.com/rocket-lab-lau…. Data for the launch can be found at: celestrak.org/NORAD/elements….

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: english.news.cn/20250315/9bd28…. Data for the launch can be found at: …

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: celestrak.org/NORAD/elements…. Deployment of 47 satellites is set to occur 2025-03-15 07:37:16.930 UTC until 2025-03-15 09:05:52.…

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 pr…

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: …

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: tass.com/defense/1928937. Data for the launch can be found at: …

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 upda…

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. …

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: english.news.cn/20250317/25635…. Data for the launch can be found at: …

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: spacenews.com/rocket-lab-lau…. Data for the launch can be found at: celestrak.org/NORAD/elements….

TSKelso: Merkouris 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.

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: spaceflightnow.com/2025/03/18/liv…. Data for the launch can be found a…

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: english.news.cn/20250321/0ef0b…. Data for the launch can be found at: …

TSKelso: NOAA is reporting and predicting elevated geomagnetic activity: celestrak.org/SpaceData/.