The Indian Space Research Organisation is prepared for its 100th mission on 9th September 2012 with the commercial launch of two foreign satellites from the spaceport of Sriharikota in Andhra Pradesh.

ISRO plans to launch 720-kg SPOT-6 remote sensing satellite from France (built by ASTRIUM SAS) and a 15-kg Japanese spacecraft Protiers on board the home-grown Polar Satellite Launch Vehicle (PSLV-C21) tomorrow, in a major milestone of sorts.


The Polar Satellite Launch Vehicle, usually known by its abbreviation PSLV is the first operational launch vehicle of ISRO. PSLV is capable of launching 1600 kg satellites in 620 km sun-synchronous polar orbit and 1050 kg satellite in geo-synchronous transfer orbit. In the standard configuration, it measures 44.4 m tall, with a lift off weight of 295 tonnes. PSLV has four stages using solid and liquid propulsion systems alternately. The first stage is one of the largest solid propellant boosters in the world and carries 139 tonnes of propellant. A cluster of six strap-ons attached to the first stage motor, four of which are ignited on the ground and two are air-lit.

The reliability rate of PSLV has been superb. There had been 20 continuously successful flights of PSLV, till April 2012 . With its variant configurations, PSLV has proved its multi-payload, multi-mission capability in a single launch and its geosynchronous launch capability. In the Chandrayaan-mission, another variant of PSLV with an extended version of strap-on motors, PSOM-XL, the payload haul was enhanced to 1750 kg in 620 km SSPO. PSLV has rightfully earned the status of workhorse launch vehicle of ISR

Countdown Status

  • 51 hours countdown of PSLV-C21 Mission started at 06:51 hours IST today (September 7, 2012) at Satish Dhawan Space Center (SDSC), Shriharikota, India.
  • Propellant filling operations of Fourth Stage (PS4) and Reaction Control Thrusters (RCT) started at 09:00 hours IST and are under progress.
  • Propellant filling operations of Fourth Stage (PS4) and Reaction Control Thrusters (RCT) completed.
  • Preparation for Propellant filling operation of Second Stage (PS2) is under progress.
  • Preparation for Mobile Service Tower (MST) withdrawal is under progress.
  • Mobile Service Tower (MST) withdrawal upto 50 meter is completed.
  • Propellant filling operation of Second Stage (PS2) under progress.

“We have today (so far) put 99 missions (62 satellites and 37 launch vehicles) from the days of Aryabhata (satellite) of 1975″, Chairman of Bangalore-headquartered space agency, K Radhakrishnan told.

“PSLV-C21 would be the 100th mission. The launch is basically for commercial purposes”.

In what could be a “double delight” for Indian space scientists, ISROs 3400-kg communication satellite GSAT-10 is also likely to be launched between September 19 and 21 by European space consortium Arianespaces Ariane-5 rocket from Kourou in French Guiana.

Radhakrishnan, also Chairman of Space Commission and Secretary in the Department of Space, said GSAT-10 would carry 30 transponders, including 12 in Ku band, along with a GAGAN (GPS Aided GEO Augmented Navigation) payload. GSAT-10 is a Rs. 750 crore mission, including launch services cost.

ISRO officials said GSAT-10, which will have a minimum operational life of 15 years, is envisaged to augment the growing need for transponders and provide communication services and augment the existing ones.

“The next launch (after GSAT-10) is going to be another PSLV launch”, Radhakrishnan said. “It (SARAL, an Indo-French satellite) is a joint activity in the sense payload is built by France (CNES), satellite is by ISRO and launch is by ISRO”.

SARAL will provide data products to operational and research user communities, in support of marine meteorology and sea state forecasting; operational oceanography; seasonal forecasting; climate monitoring; ocean, earth system and climate research, ISRO officials said.

Courtesy:http://www.isro.org

Post By

M.Shiva Chaitanya(4/4 ECE) MGIT

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