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बेसिक इंग्लिश का दूसरा सत्र (कक्षा प्रारंभ : 22 अक्तूबर, शाम 3:30 से 5:30)
Communication Satellite GSAT-15 Launched Successfully
Nov 14, 2015

GSAT-15, India’s communication satellite, was launched successfully by the European Ariane 5 VA-227 launch Vehicle in the early morning hours of November 11. After a smooth countdown lasting 11 hours and 30 minutes, the Ariane 5 launch vehicle lifted off at 03.04 hrs (3:04 am) IST.

  • After a flight of 43 minutes and 24 seconds, GSAT-15 separated from the Ariane 5 upper stage in an elliptical Geosynchronous Transfer Orbit (GTO) with a perigee (nearest point to Earth) of 250 km and an apogee (farthest point to Earth) of 35,819 km, inclined at an angle of 3.90 to the equator.  The achieved orbit was very close to the intended one.

  • ISRO's Master Control Facility (MCF) at Hassan in Karnataka took over the command and control of GSAT-15 immediately after its separation from the launch vehicle.

  • After the completion of orbit raising operations, the two solar arrays and both the antenna reflectors of GSAT-15 will be deployed.  Following this, the satellite will be put in its final orbital configuration.  

  • GSAT-15 will be positioned at 93.50 East longitude in the geostationary orbit along with the operational INSAT-3A and INSAT-4B satellites. 

  • Later, it is planned to experimentally turn on the communication payloads of GSAT-15. 

  • After the successful completion of all the in-orbit tests, GSAT-15 will be ready for operational use.  

  • The 3164 kg GSAT-15 carries communication transponders in Ku-band as well as a GPS Aided GEO Augmented Navigation (GAGAN) payload operating in L1 and L5 bands.

  • It also carries a Ku-band beacon as well to help in accurately pointing ground antennas towards the satellite.

  • GSAT-15 will enable ISRO to provide continuity of service to Indian users in Ku-band and the navigation payload GAGAN of GSAT-15 will provide in orbit backup to ensure safety of life navigation services in civil aviation sector as well as other location based services to various services in the Indian region.

  • GSAT-15 is the third satellite to carry GAGAN payload after GSAT-8 and GSAT-10, which are already providing navigation services from orbit. 

  • GSAT-15 is the 19th payload launched by Arianespace for ISRO.

  • GSAT-17 and GSAT-18 are getting ready for launch by Ariane vehicle in the next year.

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