April 23, 2012 by drdave India to Launch Radar Imaging Satellite (RISAT-1) Indian Space Research Organization (ISRO) Prepares the Radar Imaging Satellite (RISAT-1) Image Credit: ISRO India is preparing to launch their Radar Imaging Satellite (RISAT-1) on Thursday at 5:45 AM local time (2345 UTC and 4:45 PM Phoenix time Wednesday). RISAT-1 is the heaviest remote sensing spacecraft that ISRO has ever built, weighing almost 1,900 kilograms. RISAT-1 will employ synthetic aperture radar (SAR) in its research. The spacecraft is headed for a polar orbit, 536 kilometers above the surface of the Earth. ED: New launch time is 0017 UTC, or 5:17 PM Phoenix time, Wednesday.