The PSLV Orbital Experimental Module (POEM-4) successfully re-entered Earth’s atmosphere on April 4, 2025, at 02:33 UTC (08:03 IST), according to the Indian Space Research Organization (ISRO). An important turning point in ISRO’s efforts to reduce space debris and guarantee sustainable space operations was reached when the module had an impact on the Indian Ocean.
Launched on December 30, 2024, POEM-4 was the PSLV-C60 rocket’s repurposed upper stage. During its orbital mission, it carried twin SPADEX satellites and carried 24 payloads for scientific experiments, including 10 from other entities and 14 from ISRO.
The re-entry demonstrates ISRO’s dedication to minimizing space debris and abiding by international standards for sustainable space operations, which is in line with its Debris Free Space Mission (DFSM).
Engine restarts at 350 km de-orbited POEM-4 to a circular orbit after it finished its mission at 475 km. Before re-entry, the module’s orbit shrank to 174 km x 165 km, and any leftover fuel was vented to avoid unintentional breakups.
To ensure accurate forecasts and a safe impact, ISRO’s System for Safe and Sustainable Space Operations Management (IS4OM) and the US Space Command closely monitored the module’s re-entry.
This accomplishment strengthens ISRO’s position as a leader in tackling space sustainability issues and promoting scientific research.
