Within 4 mins of flight launch, ISRO knew it was coming

ISRO Faced Fail in Launch on Thursday

"We are looking into the details of what has happened and we will do the analysis and subsequently come back with the details", Kumar said shortly after the satellite's equipment failed to disjoin as scheduled about 20 minutes after the lift-off.

He added that a portion of the rocket with the satellite enclosed in the heat shield was now orbiting 163km x 6,600 km and was being tracked by the multi-object tracking radar at Satish Dhawan Space Centre, Sriharikota. PSLV-C39, which lifted off from Sriharikota could not deliver the IRNSS-H1satellite into orbit as the heat shield - the tip of the rocket where the satellite was housed - failed to open. "For example, it should have attained a velocity of 9.5km per second at the end of it but attained only 8.5km per second", said Former ISRO Satellite Centre director SK Shivakumar. This affected its velocity.

Some Isro scientists told TOI that they may have to take a relook at the technology used for the heat shield separation. It is expected to separate and fall off after a satellite is placed into orbit.

The forty first flight of India's Polar Satellite Launch Vehicle (PSLV-C39), conducted today (August 31, 2017) evening from Satish Dhawan Space Centre SHAR, Sriharikota, was unsuccessful. "I can not accurately say by how much it missed the desired altitude".

Addressing the press conference after the launch failure, the chairman Kiran Kumar said, "The rocket heat shield didn't separate".

ISRO said it will probe why the shield didn't peel off. There has been a snag that resulted in the heat shield not separating. what exactly caused that needs to be found out.

The 29-hour countdown began on Wednesday at 2pm and scientists are now involved in filling up the propellants, the officials said, adding that the countdown is progressing well.



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