Chennai, Feb. 27 -- The 22.5 hour countdown for tomorrow's launch of PSLV-C51, which would be carrying 637 kg Brazillian Satellite Amazonia-1 and 18 co-passenger satellites, began at 0854 hrs on Saturday at the spaceport of Sriharikota, about 100 km from here.

''Countdown for the launch of PSLV-C51/Amazonia-1 mission commenced today at 0854Hrs from Satish Dhawan Space Centre (SDSC) SHAR, Sriharikota'', ISRO tweeted.

The launch would take place from the First Launch Pad at 1024 hrs on Sunday.

This would be one of the longest mission for the Space Agency that would last nearly two hours.

This would be the first mission of this year and the first dedicated commercial mision for the newly formed NewSpace India Limited (NSIL).

Aft...