Thursday, June 9, 2011

ISRO Successfully Puts GSAT-8 into Geosynchronous Orbit Read more about ISRO Successfully Puts GSAT-8 into Geosynchronous Orbit


   ISRO Successfully Puts GSAT-8 into 

             Geosynchronous Orbit

Bangalore : Indian Space Research 
Organization (ISRO) on Wednesday 
successfully advanced communication 
satellite GSAT-8 to geosynchronous orbit 
with an orbital period of 23 hours and 45 

Information to this effect was made by 
ISRO that the satellite's orbit has a perigee 
(closest point to Earth) of 35,543 km, an 
apogee (farthest point to Earth) of 35,770 
km and an orbital inclination of 0.04 degree 
with respect to the equatorial plane.
Solar arrays on both sides of the satellite have been deployed and they are tracking the sun and 
generating electrical power, the Bangalore-based ISRO said on Wednesday.

These solar arrays are designed to generate 6,240 W of electrical power. Two large dual grid 
Ku-band antennae have been opened and are pointing towards the Earth, it said.

On Wednesday, the satellite was put into the final orbital configuration pointing towards the 
Earth continuously.

GSAT-8 is presently located at 47 degree East longitude and is being moved towards its final 
orbital position of 55 degree East, where it will be co-located with the INSAT-3E satellite.

In Orbit Testing of 24 Ku-band transponders of GSAT-8 is scheduled to begin on 1st 
June and the satellite is expected to be ready for service in about a month, it said.

Testing of GAGAN navigational payload would be conducted from the new Navigation Control 
Centre at Kundanahalli near Bangalore.

Launch Date
GSAT-8, India’s advanced communication satellite, is a high power communication satellite being inducted in the INSAT system. Weighing about 3100 Kg at lift-off, GSAT-8 is configured to carry 24 high power transponders in Ku-band and a two-channel GPS Aided Geo Augmented Navigation (GAGAN) payload operating in L1 and L5 bands.

The 24 Ku band transponders will augment the capacity in the INSAT system. The GAGAN payload provides the Satellite Based Augmentation System (SBAS), through which the accuracy of the positioning information obtained from the GPS Satellite is improved by a network of ground based receivers and made available to the users in the country through the geostationary satellites.
Weight3093 kg (Mass at Lift – off)
1426 kg (Dry Mass)
PowerSolar array providing 6242 watts three 100 Ah Lithium Ion batteries
Physical Dimensions2.0 x 1.77 x 3.1m cuboid
Propulsion440 Newton Liquid Apogee Motors (LAM) with mono Methyl Hydrazine (MMH) as fuel and Mixed oxides of Nitrogen (MON-3) as oxidizer for orbit raising.
Stabilisation3-axis body stabilised in orbit using Earth Sensors, Sun Sensors, Momentum and Reaction Wheels, Magnetic Torquers and eight 10 Newton and eight 22 Newton bipropellant thrusters
Two indigenously developed 2.2 m diameter transmit/receive polarisation sensitive dual grid shaped beam deployable reflectors with offset-fed feeds illumination for Ku-band; 0.6 m C-band and 0.8x0.8 sq m L-band helix antenna for GAGAN
Launch date
May 21, 2011
Launch siteKourou, French Guiana
Launch vehicleAriane-5 VA-202
OrbitGeosynchronous (55° E)
Mission lifeMore Than 12 Years

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