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The ISRO launched 100th satellite from Satish Dhawan Space Centre in Sriharikota on Friday. Thirty one satellites is being launched in a single mission, in a milestone event in the country's space history.

"PSLV-C40 Successfully Launches Cartosat-2 Series Satellite", ISRO said in a Twitter message.

That rocket was carrying India's first private sector-built navigation satellite IRNSS-1H, which could not be ultimately put into orbit after the rocket carrying it developed a technical glitch.

Roughly around 45 minutes later, the rocket would eject its 31st satellite - Isro's Microsat - in the second orbit at an altitude of 359km.

"The microsatellite will be India's 100th satellite in space", ISRO Satellite Centre Director M. Annadurai had told IANS on Tuesday.

Blasting-off on a lovely misty morning from the first launch pad of Satish Dhawan Space Centre in Sriharikota, which about 100 km from Chennai, 44.4 metre tall PSLV-C40 has roared into upper atmosphere with a lift-off mass of 320 tonne as majestically as ever. "With a capability to carry up to 3 kg of payload and a total satellite mass of 11 kg, it offers huge opportunities for future use", the ISRO said.

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He said the previous launch faced a heat shield problem and an ISRO committee has addressed it and taken steps to ensure the vehicle was "robust".

The mission control had fired the engines to restart the fourth stage for lowering the rocket to deploy the micro satellite in its intended orbit.

The Cartosat-2 remote-sensing satellite, the main payload onboard the PSLV C-40, will boost data services for users that will be used in urban and rural applications, coastal land use and regulation, monitoring of road networks, water distribution, land use mapping.

Soon after the failed mission, there was talk about possible internal sabotage, speculation that an ISRO official brushed away in an interview to a TV channel.

"The PSLV has performed well in the past with several successful launches", said A.S. Kiran Kumar, ISRO's chairman, in a story published by the Bangalore Mirror.