India Launches IRNSS-1D, India’s Fourth Navigation Satellite

India-Launches-IRNSS-1D,-India's-Fourth-Navigation-SatelliteISRO’s Polar Satellite Launch Vehicle, PSLV-C27, successfully launched the 1425 kg IRNSS-1D, the fourth satellite in the Indian Regional Navigation Satellite System (IRNSS) from Satish Dhawan Space Centre SHAR, Sriharikota.

After the PSLV-C27 lift-off at 1719 hrs IST from the Second Launch Pad with the ignition of the first stage, the subsequent important flight events, namely, strap-on ignitions and separations, first stage separation, second stage ignition, heat-shield separation, second stage separation, third stage ignition and separation, fourth stage ignition and satellite injection, took place as planned.

After a flight of about 19 minutes 25 seconds, IRNSS-1D Satellite was injected to an elliptical orbit of 282.52 km X 20,644 km (very close to the intended orbit) and successfully separated from the PSLV fourth stage.

The prime minister, Narendra Modi, today congratulated India’s scientists on the launch of IRNSS-1D satellite.

“Launch of satellite IRNSS-1D is yet another manifestation of the exemplary efforts and utmost brilliance of our scientists. Congrats to them,” said Modi.

The president of India, Pranab Mukherjee congratulated ISRO for the successful launch of PSLV-C27 and said, “I am very happy to know that this is the fourth in the series of seven satellites of the Indian Regional Navigation Satellite System. I understand the IRNSS-1D will provide navigation, tracking and mapping services which will take us closer to setting up our own navigation system.”

After injection, the solar panels of IRNSS-1D were deployed automatically. ISRO’s Master Control Facility (at Hassan, Karnataka) took over the control of the satellite. In the coming days, four orbit manoeuvres will be conducted from Master Control Facility to position the satellite in the Geosynchronous Orbit at 111.75 deg East longitude with 30.5 deg inclination.

IRNSS-1D is the fourth of the seven satellites constituting the space segment of the Indian Regional Navigation Satellite System. IRNSS-1A, 1B and 1C, the first three satellites of the constellation, were successfully launched by PSLV on July 2, 2013, April 4, 2014 and October 16, 2014 respectively. All the three satellites are functioning satisfactorily from their designated orbital positions.

In the coming months, the next satellite of this constellation, namely, IRNSS-1E, is scheduled to be launched by PSLV. The entire IRNSS constellation of seven satellites is planned to be completed by 2016.

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