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POEM (PSLV Orbital Experimental Module) is an experimental mission by ISRO which performs in-orbit scientific experiments using the spent PS4 stage of the PSLV-CA launch vehicle as an orbital platform.

It is first time that PS4 stage would orbit the earth as a stabilized platform. Attitude stabilization is achieved using a dedicated NGC system. POEM derives the power from the solar panels mounted around the PS4 tank and a Li Ion battery. It navigates using four sun sensors, a magnetometer, gyros and NavIC. It carries dedicated control thrusters using Helium gas storage. It is enabled with telecommand feature.

POEM carries six payloads including two from Indian Space Start-ups M/s Digantara and M/s Dhruva Space, enabled though IN-SPACe and NSIL.

  • Digantara's payload is commercial space-weather monitoring system called ROBI (ROBust Integrating proton fluence meter).
Nation: India
Type / Application: Technology
Operator: ISRO
Contractors: ISRO (stage); Space Physics Laboratory (instrument)
Equipment: 6 hosted experiments
Configuration: Instruments on PS-4 stage
Propulsion: ?
Power: Solar cells, batteries
Orbit: 532 km 582 km, 9.95
Satellite COSPAR Date LS Launch Vehicle Remarks
POEM 2022-072E ? 30.06.2022 Sr SLP PSLV-CA with DS-EO, NeuSAR, SCOOB 1
POEM 2 2023-057A 22.04.2023 Sr FLP PSLV-CA (2) with TeLEOS 2, Lumelite 4
POEM 3 2024-001B 01.01.2024 Sr FLP PSLV-DL with XPoSat


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