The Indian Space Research Organisation (ISRO), which is scheduled to launch the Polar Satellite Launch Vehicle C55 (PSLV-C55) mission, will carry out in-orbit scientific experiments by using the spent PS4 (fourth and final stage of PSLV) as an orbital platform.

Key details:

  • The PSLV-C55 will have Singapore’s TeLEOS-2 as primary satellite and Lumelite-4 as a co-passenger satellite.
  • The TeLEOS-2 and Lumelite-4 satellites are intended to be launched into an eastward low inclination orbit.
  • Once deployed and operational, it will be used to support the satellite imagery requirements of various agencies within the Government of Singapore.
  • The TeLEOS-2 will be able to provide all-weather day and night coverage, and be capable of imaging at 1m full-polarimetric resolution.
  • The PSLV-C55 mission has the PSLV Orbital Experimental Module (POEM), where the spent PS4 of the launch vehicle would be utilised as an orbital platform to carry out scientific experiments through non-separating payloads.

What Is Poem?

  • Dubbed PSLV Orbital Experimental Module, Poem is the spent fourth stage of the launch vehicle that would be used as an orbital platform to carry out scientific experiments through non-separating payloads.
  • Isro is now repurposing this fourth stage to use an experimental platform.
  • The mission will carry seven non-separable payloads from Isro, Bellatrix, Dhruva Space, and the Indian Institute of Astrophysics neatly packed on this fourth stage.

What is PSLV:

  • PSLV is a four-stage rocket, and while the first three stages are jettisoned into the ocean after they push the mission to desired orbit, the fourth-stage remains in orbit and becomes space junk.
  • This is the third time that PS4 will be used after satellite separation as a platform for experiments.


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