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HindustanTimes Thu,18 Dec 2014

Isro gears up for final Mangalyaan orbit-raising move

Vanita Srivastava , Hindustan Times  New Delhi, November 16, 2013
First Published: 00:22 IST(16/11/2013) | Last Updated: 00:55 IST(16/11/2013)

The Indian Space Research Organisation (Isro) has geared itself for the fifth orbit raising operation of the Mangalyaan  at 2:27 am on Saturday, the final one in a series of earth-bound manoeuvres before being finally ejected out of the earth’s sphere of influence on December 1.

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The apogee(farthest point from earth) after the fifth firing will be increased from 1,18,600 km to 1,92,874 km. The velocity will be increased to 101m/sec.

This will be the final earth bound manoeuvre before the crucial Trans-Mars injection on December 1 for the spacecraft to move out of the sphere of influence of earth towards Mars.

There was a glitch in the fourth orbit raising operation following which a supplementary operation had to be done to raise the apogee.

During the orbit-raising operations conducted since November 7, Isro has been testing and exercising the autonomy functions progressively that are essential for Trans-Mars Injection (TMI) and Mars Orbit Insertion. The spacecraft has to take several rounds around earth to gradually increase its velocity to attain escape velocity with minimum fuel consumption.


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