GSLV-D6 successfully launched GSAT-6 communication satellite

The launch vehicle introduced 2117 kg GSAT-6, an advanced communication satellite into a Geosynchronous Transfer Orbit (GTO).

Created On: Aug 27, 2015 14:05 ISTModified On: Sep 1, 2015 13:14 IST

Geosynchronous Satellite Launch VehicleGeosynchronous Satellite Launch Vehicle (GSLV)-D6 was successfully launched on 27 August 2015. It was launched from the Second Launch Pad at the Satish Dhawan Space Centre SHAR (SDSC SHAR), Sriharikota in Andhra Pradesh.

GSLV-D6 inducted 2117 kg GSAT-6, an advanced communication satellite into a Geosynchronous Transfer Orbit (GTO). The satellite is intended to provide S-band communication services in the country.

Key Features of GSLV-D6

• It is the ninth flight of GSLV. It is also the fifth developmental flight of GSLV.
• This is the third time the indigenously developed Cryogenic Upper Stage (CUS) is being carried on-board during a GSLV flight. The flight is significant since it intends to continue the testing of CUS.
• It is configured with all its three stages including the CUS similar to the ones successfully flown during the previous GSLV-D5 mission in January 2014. GSLV-D5 successfully placed GSAT-14 satellite carried on-board in the intended GTO very accurately.

Importance of Cryogenic Upper Stage (CUS)

A Cryogenic rocket stage is more efficient and provides more thrust for every kilogram of propellant it burns compared to solid and earth-storable liquid propellant rocket stages.

The cryogenic stage is technically a very complex system compared to solid or earth-storable liquid propellant stages due to its use of propellants at extremely low temperatures and the associated thermal and structural challenges.

Oxygen liquifies at -183 deg C and Hydrogen at -253 deg C. The propellants, at these low temperatures, are to be pumped using turbo pumps running at around 40,000 rpm.

About GSAT System

• The GSAT or Geosynchronous satellite is a constellation of communication satellites developed by the Indian Space Research Organisation (ISRO) with an objective to make India self-reliant in broadcasting services.
• Satellites are called GSAT because they function in a geosynchronous orbit around the Earth.
• It is designed to inject 2 ton class of communication satellites into GTO.
• The first satellite in the series GSAT-1 was launched in April 2001.
• Till date, 12 satellites were launched and only six among them are operational.

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