PSLV-C31 launches the fifth satellite of the Indian Regional Navigation Satellite System IRNSS-1E from Sriharikota today at 9.30 am. this is ISRO's 50th orbital launch with the PSLV deploying the IRNSS navigation satellite into geosynchronous transfer orbit. This was the 33rd flight of PSLV launch vehicle. IRNSS-1E is the fifth navigation satellite in the IRNSS space system, comprising seven satellites.