The Indian space agency(ISRO) successfully put its first navigation satellite - the Indian Regional Navigation Satellite System-1A (IRNSS-1A) - in the geosynchronous orbit at 27 degrees to the equator.
India’s Polar Satellite Launching took place from Satish Dhawan Space Centre in southeastern India on .The orbit-raising activities were done from the mission control facility at Hassan in Karnataka. The rocket flew in the PSLV-XL configuration, which was first used in 2008 to launch the Chandrayaan 1 spacecraft to the Moon.
To date, the PSLV-XL has made three flights – also deploying the GSAT-12 communications satellite, and the RISAT-1 radar imaging satellite. The PSLV-XL is a four-stage carrier rocket augmented at liftoff by six boosters. The second and fourth stages are liquid-fuelled, while the first and third stages and boosters use hydroxyl-terminated polybutadiene-based solid propellant. The first stage is a PS1, which utilities an S-138 solid rocket motor. During the early stages of flight, six PS0M-XL strap-on solids, powered by S-12 motors, will augment the first stage’s thrust. The use of PS0M-XL solids, in place of the smaller S-9 powered PS0M solids used on the regular PSLV, is the main difference between the PSLV-XL and the standard PSLV. The second stage of the PSLV, the PS2, is powered by an L40 Vikas engine, derived from the Viking engine developed for the European Ariane rocket. It is fuelled by UH25 propellant – a mixture of unsymmetrical dimethylhydrazine and hydrazine hydrate, and uses dinitrogen tetroxide as oxidizer. The third stage, or PS3, has an S-7 solid motor. The final stage is the PS4, which burns monomethylhydrazine oxidised by MON-3 – a mixture of nitric oxide, dinitrogen tetroxide and nitrogen dioxide. The PS4 is powered by two L-2-5 engines.
The launch vehicle placed the 1,425-kilogram IRNSS-1A satellite into its intended elliptical orbit with an apogee of about 20,600 kilo meters and a perigee of 280 kilo meters with an inclination of 18 degrees with respect to the equator. "From there, it will be taken to a geosynchronous circular orbit of 36,000 [kilometers] with 29 degrees inclination," according to ISRO. Everything connected with IRNSS-1A is normal and the satellite is slowly floating towards its final intended circular geosynchronous orbit at 55 degrees East location with an inclination of 29 degrees to the equator.
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