ISRO is preparing for another milestone mission, with the countdown for the Bluebird Block-2 satellite scheduled to start at 8:54 am today. The LVM3-M6 launcher will take off from Sriharikota tomorrow at the same time, placing the satellite into orbit within 15 minutes. Ahead of launch, ISRO Chief Narayanan offered prayers at temples in Sullurpet and Tirumala.