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According to ISRO, the countdown began at 12.57 p.m.
On Sunday, Prime Minister Narendra Modi said the South Asia Satellite, will go a long way in addressing the region's economic and developmental priorities.ALSO READ: South Asia Satellite: What is India's Rs 235-crore gift to its neighbours?
"The capacities of this satellite and the facilities it provides will go a long way in addressing South Asia's economic and developmental priorities," he said in his monthly radio address 'Mann Ki Baat'.
"Natural resources mapping, telemedicine, the field of education, deeper IT connectivity or fostering people-to-people contact, this satellite will prove to be a boon in the progress of the entire region."
"It is an important step by India to enhance cooperation with the entire South Asia... It is an invaluable gift.
This is an appropriate example of our commitment towards South Asia. I welcome all the South Asian countries who have joined us on this momentous endeavour," he had said.
The space agency said that the GSAT-9 is configured around the ISRO's standard I-2K bus, with a lift-off mass of 2,230 kg, and the satellite's main structure is cuboid in shape built around a central cylinder with a mission life of more than 12 years.
According to an official, ISRO on experimental basis decided to have electric power for the satellite.
"We have not reduced the volume of the traditional on-board fuel because of the electric power. We have added electric power facility to check its performance for use in future satellites," the official told IANS.
He said the next satellite with electric power will be the GSAT-20 slated for launch next year.
Meanwhile, the ISRO is also gearing up to launch its heaviest rocket GSLV-Mk III later this month.ALSO READ: How the South Asia Satellite will help India boost ties with neighbours