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Sriharikota(AndhraPradesh):The Indian Space Research Organisation (ISRO) is all set to launch its first space observatory ‘Astrosat’ on board a PSLV rocket from here at 10 a.m Friday.The Polar Satellite Launch Vehicle PSLV-C30 will carry the country’s first dedicated satellite for astronomical research, Astrosat into a low earth equatorial orbit after its take-off from the first launch pad of Satish Dhawan Space Centre.PSLV will fly in its extended configuration this time, keeping in view the total payload weight of 1631 kg.Within 22 minutes 33 seconds of ignition of the PSLV, it would lob Astrosat in its 650 km orbit, followed by the smaller payloads.The 50-hour countdown for the rocket launch began at 8.00 a.m on Saturday at the Satish Dhawan Space Centre in Sriharikota in Andhra Pradesh.The Astrosat has the ability to observe celestial bodies like distant stars and cosmic X-Ray sources in different wavelengths simultaneously.Along with Astrosat, four identical nano-satellites of Spire Global Inc., the US, a micro-satellite from Indonesia and a nano-satellite of the University of Toronto, Canada are also set to take off.With a life span of five years, Astrosat observe the universe through optical, ultraviolet, low and high energy X-ray components of the electromagnetic spectrum, whereas most other scientific satellites are capable of observing through a narrow wavelength band, the agency said.The successful launch of Astrosat will make India to become the fourth country in the world to have launched a space observatory after the US, Russia and Japan.