The 415.6-tonne GSLV rocket, measuring 49.1 metres in height, is expected to take off at 4.56 pm from the second launch pad at the Indian rocket port in Sriharikota around 105 km away from Chennai.
The GSAT-6A satellite is expected to be put into orbit 17 minutes after being launched.
According to ISRO, two improvements-induction of the high-thrust Vikas engine and an electromechanical actuation system- have been made in the rocket’s second stage this time around.
Isro said that GSAT-6A, similar to GSAT-6 is a high power S-band communication satellite based on the I-2K satellite bus.
The mission life of the spacecraft planned is about 10 years.
The satellite will also provide a platform for developing technologies such as demonstration of the 6-metre S-Band Unfurlable Antenna, handheld ground terminals and network management techniques that could be useful in satellite-based mobile communication applications.
GSAT-6A is scheduled to be launched by the GSLV-F08.
GSAT-6A would be followed by the launch of navigation satellite which will be in the next fiscal.
In the union budget for 2018-19, the Department of Space has been tasked with three earth observation space crafts ready for launch; four Polar Satellite Launch Vehicle (PSLV) flights; one each of Geosynchronous Satellite Launch Vehicle MkII and Mk III.
* 12th flight of Geosynchronous Satellite Launch Vehicle (GSLV)
* Sixth flight with Indigenous Cryogenic Upper Stage
* GSLV-F08 height 49.1 m and weight 415.6 tonnes
* GSAT-6 is a high power S-band communication satellite configured around I-2K bus.
* Mission life planned is about 10 years
* Satellite could be useful in satellite-based mobile communication applications. GSAT-6A is scheduled to be launched by GSLV-F08