Wednesday, 15 October 2008

Chandrayaan - India’s first mission to the Moon

The Chandrayaan-1 mission was announced by the Prime Minister AB Vajpayee during his Independence Day address on Aug 15 2003
And now it’s ready to start 52 hour final count down from 4.00 a.m. on October 20
This mission is to know the answers for the below questions
How could earth acquire such a large satellite?
What is the moon’s origin?
What is the moon’s Chemical composition? 
Relatively ISRO said it would spur the Indian scientific community and probe the physical characteristics of the lunar surface in greater depth than previous missions by other nations. It will explore its minerals, map the terrain and find out whether water and helium deposits exist. It will also give us a deeper understanding about the planet Earth itself or its origins, earlier missions did not come out with a full understanding of the moon and that is the reason scientists are still interested. 
It’s the unmanned lunar exploration mission by ISRO (Indian Space Research and Organization). Mission includes a lunar orbiter and an Impactor. The space craft will be launched by enhanced version of PSLV (Polar Satellite Launch Vehicle). 
PSLV will carry 11 payloads – 5 from India and 6 from abroad. Within 25 seconds of the lift-off from the second launch pad, the two strap-on motors will fire the rocket to place Chandrayaan into a highly elliptical transfer orbit around earth in the next 110 seconds. 
After circling earth in its transfer orbit for a while, the spacecraft will be put into more elliptical orbits by repeatedly firing its liquid apogee motor (LAM) at opportune moments. 
The LAM onboard will be fired again to make the spacecraft travel to the vicinity of moon by following a path called lunar transfer trajectory (LTT), whose apogee - farthest point from earth - is at 387,000 km. 
"The initial operation, crucial for launching and putting the spacecraft into the elliptical transfer orbit, is programmed to last 1,089 seconds or 18.9 minutes. Over the next 18 days, the spacecraft is made to get into an elliptical lunar orbit with the help of moon's gravity and LAM onboard," Prasad pointed out. 
After a detailed observation of the lunar orbit perturbations, the orbital height of Chandrayaan will be finally lowered to its intended 100 km height from the lunar surface. 
"Once the spacecraft stabilizes in its intended orbit, the moon impact probe will be ejected at the earliest opportunity to hit the lunar surface in a chosen area. Cameras and other scientific instruments are turned on and 
tested for the operational phase, which is expected to last for two years.

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