New Delhi, Apr 26 (PTI) Prime Minister Manmohan Singh today hailed the successful launch of PSLV carrying RISAT-1 and congratulated the scientists associated with the project. The Prime Minister called Secretary Department of Space and Chairman Indian Space Research Organisation K Radhakrishnan to congratulate him and the scientists for the successful launch, the PMO said. India's first indigenous all-weather Radar Imaging Satellite (RISAT-1), whose images will facilitate agriculture and disaster management, was launched successfully on board the PSLV-C19 from Sriharikota in the early hours today. PTI AKK