Re-Entry of POEM-4 Module

April 7, 2025

Recently, the Indian Space Research Organisation (ISRO) achieved milestone with the controlled re-entry of the PSLV Orbital Experimental Module (POEM-4) into Earth’s atmosphere. The successful re-entry puts stress on ISRO’s commitment to managing space debris and promoting sustainable operations in outer space.

POEM-4 Mission

POEM-4 was launched on December 30, 2024, as part of the Space Docking Experiment (SpaDeX) mission. It served as the upper stage of the PSLV-C60 rocket. After deploying satellites at an altitude of 475 km, POEM-4 maintained its orbit while hosting 24 payloads, including 14 from ISRO and 10 from non-governmental entities.

Controlled De-Orbiting Process

To ensure a safe re-entry, ISRO engineers performed engine restarts to de-orbit POEM-4 to a nearly circular orbit at 350 km with a 55.2° inclination. The module was passivated by venting remaining fuel, reducing the risk of accidental break-up during descent.

Payloads and Scientific Contributions

During its operational period, POEM-4 hosted various innovative payloads. Notably, it included India’s first astrobiology experiments developed by students from RV College of Engineering and Amity University. The payloads successfully collected valuable scientific data, contributing to research in space technology and astrobiology.

Monitoring and Tracking

Throughout its mission, POEM-4 was continuously monitored by ISRO’s radar facilities and the United States Space Command (USSPACECOM). The tracking data provided critical information for precise predictions regarding the module’s re-entry trajectory.

ISRO’s Commitment to Sustainability

The re-entry of POEM-4 aligns with ISRO’s Debris Free Space Mission (DFSM), aimed at ensuring the long-term sustainability of outer space. The agency’s efforts in managing space debris reflect its responsibility towards maintaining a safe and sustainable environment in space.

Future Implications

The successful re-entry of POEM-4 sets a precedent for future missions. It demonstrates ISRO’s capability in managing space operations and reinforces the importance of sustainable practices in the growing field of space exploration.

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