The announcement comes two days ahead of the proposed historic launch of the ISRO's 100th satellite along with 30 others in a single mission from Sriharikota.
The Appointments Committee of the Cabinet approved Sivan's appointment as secretary, Department of Space and chairman of Space Commission for a tenure of three years, an order issued by the personnel ministry said.
Sivan, at present Director of Vikram Sarabhai Space Centre, will succeed Kumar who took over as ISRO chairman on January 12, 2015.
Subsequently, he completed his PhD in Aerospace engineering from IIT, Bombay in 2006.
Sivan joined the ISRO in 1982 in Polar Satellite Launch Vehicle (PSLV) project and has contributed immensely towards end to end mission planning, mission design, mission integration and analysis.
He held various responsibilities during his stint in ISRO.
Sivan has numerous publications in various journals and is a fellow of Indian National Academy of Engineering, Aeronautical Society of India and Systems Society of India.
The ISRO is scheduled to launch the first PSLV mission after the unsuccessful launch of thenavigation satellite IRNSS-1H in August last year.
"The 31 spacecrafts, including weather observation Cartosat-2 series satellite, will be launched by PSLV-C40," ISROSatellite Centre (ISAC) director M Annadurai had said yesterday.
When the last satellite is ejected out it will become the hundredth satellite," he said.
PSLV-C40 will launch the 710 kg Cartosat-2 series satellite for earth observation and 30 co-passengers(together weighing about 613 kg) at lift-off on January 12 at09.28 am, ISRO said.
The co-passenger satellites include one micro and nano satellite each from India. Three micro and 25 nano satellites from six countries namely Canada, Finland, France, Republic of Korea, the UK and the US, make up the other payload.
On August 31, India's mission to launch its backup navigation satellite IRNSS-1H on board PSLV-C39 failed after a technical fault on the final leg following a perfect launch.
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