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Chandrayaan-3 mission countdown started


The space agency will launch Chandrayaan-3 by LVM3 rocket at 2.35 pm on Friday. Updating on the mission, ISRO said that the propellant filling is in progress. The Mission Readiness Review for the launch has already been completed and the board has authorised the launch.


The Chandrayaan-3 which will be India’s third lunar mission consists of an indigenous lander module (LM), propulsion module (PM), and a rover with an objective of developing and demonstrating new technologies required for inter-planetary missions.

According to ISRO Chairman S Somanath, while Chandrayaan-2 had a success-based design, Chandrayaan-3 has a failure-based one.


“We expanded the area of landing from 500m x 500m to four km by 2.5 km. It can land anywhere, so it doesn’t limit you to target a specific point. It will target a specific point only in nominal conditions. So, if the performance is poor, it can land anywhere within that area,” Somanath said.


On Monday, he shared minute details about what went wrong with the Vikram lander of Chandrayaan-2 as it went hurtling down towards the identified 500m x 500 m landing spot on the lunar surface with the engines designed to reduce its velocity developing higher thrust than expected.


“The primary issues were, one we had five engines which were used to give the reduction of the velocity, which is called the retardation. These engines developed higher thrust than what was expected,” he told reporters.


Somanath said that when such a higher thrust was happening, the errors on account of this differential were accumulated over some period.


“All the errors got accumulated, which was on the higher side than what we had expected. The craft had to make very fast turns. When it started to turn very fast, its ability to turn was limited by the software, because we never expected such high rates to come. This was the second issue,” the ISRO chief said.


The ISRO chief said the Vikram lander now has additional solar panels on other surfaces to ensure that it generates power no matter how it lands.


“We asked if it lands with higher velocity, what will happen? Can it not land? Then we increased the vertical velocity component from 2 m/s to 3 m/s and tested it totally,” he said.


Credits: https://www.news18.com/india/chandrayaan-3-countdown-starts-1pm-today-isro-scientists-take-miniature-model-to-tirupati-watch-8321047.html

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