Indian Space Research Organisation to launch IRNSS-1H on Thursday Indian Space Research Organisation to launch IRNSS-1H on Thursday The 29-hour Countdown For The Thursday Evening Launch Of Indiaâs Navigation Satellite IRNSS-1 Using Rocket Polar Satellite Launch Vehicle (PSLV) Began On Wednesday. News Nation Bureau | Edited By : Deepak Mahato | Updated on: 30 Aug 2017, 05:54:37 PM New Delhi: The 29-hour countdown for the August 31 evening launch of India’s navigation satellite IRNSS-1 H using rocket Polar Satellite Launch Vehicle (PSLV) began on Wednesday. IRNSS-1 H is India’s first satellite that is co-assembled by Indian Space Research Organisation with a private consortium.