Lunar dust likely to be major hurdle: ISRO Chairman K Sivan

One of the four major hurdles to the mission is preventing the damage to lander Vikram due to lunar dust.

Published: 21st August 2019 06:55 AM  |   Last Updated: 21st August 2019 06:55 AM   |  A+A-

ISRO Chairman K Sivan

ISRO Chairman K Sivan. (Photo: File/ EPS)

Express News Service

BENGALURU: One of the four major hurdles to the mission is preventing the damage to lander Vikram due to lunar dust. This dust is likely to rise when the lander is setting on the moon from the distance of 30 metres.ISRO has designed Vikram in such a way that the lunar dust does not form plumes and settles on the top of the lander. “Moon dust is a major concern for any moon landing mission,” ISRO Chairman, K Sivan had said. However  ISRO has devised a way of overcoming this hurdle.

HOW IT HAPPENS

In the past, four thrusters at four corners would be used for landing, and during that moment, dust rises and covers the entire lander.To prevent the blanket of dust settling on the spacecraft, the lander will stop the use of four corner engines and will only settle on one single central thruster. “This will happen after the lander reaches an altitude of 30 metre, from where the central engine will fire,” he said.
The plume coming from one engine will hit the ground and the “dust will go flat outwards and settle away from the lander. It won’t come up. The criticality is because of the possibility of dust being reduced because of the use of the central engine,” he said.

WHY THESE FOUR BURNERS AT ALL?

However, these four engines have a role of their own, and are crucial  in the earlier stages — a day following the lander-orbiter separation, on September 3. The engines will be necessary for burns between two rotations. On September 4 again, the four burners will be needed to achieve a lesser altitude  from 100x100 km to 100x35 km orbit, and is essential to make the descent to the lunar surface easy.
Following the descent, the pictures of the moon’s surface will also be available right then. “When the lander comes down to a point where it is normal to the surface of the moon, pictures will be available after that,” Sivan assured.Pictures will also be taken by the rover after it rolls out. However, clear pictures of lander and rover will be available only five-and-a-half hours after the landing, he said.

ANOTHER MAJOR HURDLE: THE LANDER TOPPLING

ISRO’s chosen point on the south pole of the moon, between craters Manzinus C and Simpelius N also plays a crucial role in the success of the mission.For the lander Vikram to safely land on the lunar surface, it cannot settle on an inclined surface, lest it topples. The space agency has estimated the slope of landing to be less than 12 degree. Anything beyond can make the lander topple, apprehends the ISRO chief. A similar debacle will be in store if one leg settles on the boulder.

LEARNING FROM ISRAEL

Sivan stressed the need to make the mission more autonomous. “This is one of the lessons from Israel’s failure of its Beresheet mission to soft-land on the moon earlier this year.We should not have ground control in descending stage,” he said, explaining that instead of the lander being remotely controlled from earth-based stations, the lander should have sensors guiding the landing. As part of this, the Indian space agency has learnt about ‘sensors characterisation’,he added.

Stay up to date on all the latest Karnataka news with The New Indian Express App. Download now
(Get the news that matters from New Indian Express on WhatsApp. Click this link and hit 'Click to Subscribe'. Follow the instructions after that.)

Comments

Disclaimer : We respect your thoughts and views! But we need to be judicious while moderating your comments. All the comments will be moderated by the newindianexpress.com editorial. Abstain from posting comments that are obscene, defamatory or inflammatory, and do not indulge in personal attacks. Try to avoid outside hyperlinks inside the comment. Help us delete comments that do not follow these guidelines.

The views expressed in comments published on newindianexpress.com are those of the comment writers alone. They do not represent the views or opinions of newindianexpress.com or its staff, nor do they represent the views or opinions of The New Indian Express Group, or any entity of, or affiliated with, The New Indian Express Group. newindianexpress.com reserves the right to take any or all comments down at any time.

flipboard facebook twitter whatsapp