The 29-hour countdown for tomorrow's launch of advanced communication satellite GSAT-6 using the GSLV-D6 rocket, powered by the indigenous cryogenic engine, began at 1152 hrs today at the spaceport of Sriharikota.<br/><br/>Indian Space Research Organisation (ISRO) sources told news agency that the GSLV-D6, carrying the 2117 kg satellite, would lift from the Second Launch Pad at 1652 hrs tomorrow evening. This would be the first GSLV mission for ISRO in 19 months, the last one being the successful GSLV-D5 mission in January last year. <br/><br/>The Mission Readiness Review (MRR) Committee and the Launch Authorisation Board (LAB) have cleared the launch, following which the 29-hour countdown commenced this noon.During the countdown, propellant filling operations would be carried out in the three-stage vehicle. <br/><br/>About 17-18 minutes after lift off, the Satellite would be placed into the Geosynchronous Transfer Orbit (GTO) with a perigee of 170 km from the earth and an apogee of 35,975 km, with an inclination of 19.95 deg. This would be the first GSLV mission for ISRO in 19 months, the last one being the successful GSLV-D5 mission in January last year.