Reentry Forecast Lands Satellite Within One Second
Samba's targeted reentry over the Pacific shows that combined telemetry and telescope data can now predict a spacecraft's final moments with exact precision.
Updated on Nov. 4, 2026 in Space
Samba, one of the four Cluster satellites operated by the European Space Agency, reentered Earth's atmosphere at 21:39:38 UTC on 31 August 2026 in a targeted reentry over the South Pacific Ocean. This was a completed reentry event, not an announced or projected one.
Why it matters
Targeted reentries let mission controllers steer a dying spacecraft into a remote ocean area rather than leaving its fate to chance. Samba's reentry was the third of the four Cluster satellites to come down this way, and its predicted time was accurate to the second, a benchmark for how well reentry forecasting now works.
The reentry time was predicted from the spacecraft's own onboard data merged with telescope observations, and the final forecast matched the actual reentry to the second. The stub does not report measured debris dispersal or the reentry corridor width.
The players
European Space Agency
Operator of the Cluster constellation, a fleet of four satellites studying Earth's magnetosphere, with Samba among them.
The details
Samba's own position and status data were combined with telescope observations to forecast when and where it would fall. Mission control had earlier changed the spacecraft's trajectory in November 2024 to steer it toward a safe Pacific reentry, and adjusted it again in January 2026 so an aircraft could observe the event. A plane departing from Tonga recorded the reentry for reentry science.
Timeline
November 2024: Mission control changed Samba's trajectory to set up a safe Pacific reentry.
January 2026: Samba's trajectory was adjusted so a plane could observe it.
31 August 2026, 21:39:38 UTC: Samba reentered over the South Pacific Ocean.
The Tech Race
Targeted reentry of a retired science spacecraft into a remote ocean is a standard end-of-life step, and Samba's timing accuracy shows that forecasting from combined telemetry and telescope data is mature for this task. The remaining Cluster satellite reentries will test whether the same method holds across the rest of the mission's fleet.
Targeted reentries reduce the risk that a defunct spacecraft lands unpredictably over populated areas, which matters for anyone living under other satellites' eventual paths. The stub does not describe any change in services or availability for everyday users.
The takeaway
Samba's exact-to-the-second reentry prediction is a useful benchmark for how precisely the remaining Cluster satellites can be brought down. Watch for the fourth and final Cluster satellite reentry, which will complete the mission's staged end-of-life sequence.
Further reading
For the broader context of how spacecraft are retired and brought down, explore our coverage in Space.
