In a textbook launch, India's Polar Satellite Launch Vehicle (PSLV) Monday successfully placed into orbit remote sensing satellite Cartosat-2B and four other satellites after a perfect lift off from the spaceport here. At the end of an over 51-hour countdown, the 44.4 meter-tall four-stage PSLV-C-15, blasted off from a launch pad at the Satish Dhawan Space Centre with ignition of the core first stage and placed the satellites in orbit one after the other. Visibly relieved scientists, headed by Indian Space Research Organization (ISRO) chairman Dr K Radhakrishnan, cheered as ISRO's workhorse PSLV soared into clear skies at 9.22 AM from the spaceport in the East Coast in Andhra Pradesh, about 100 km north of Chennai city, according to a report of the Press Trust of India (PTI). The PSLV launch assumes significance as it comes about three months after ISRO suffered a major setback on April 15 when the Geosynchronous Satellite Launch Vehicle (GSLV-D3), which was launched using an Indian-designed and built cryogenic engine for the first time, failed and fell into the Bay of Bengal. Cartosat-2B is an advanced remote sensing satellite built by ISRO. This is the latest in the Indian remote sensing satellite series and the 17th in this series.