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Chandrayaan-2: Was India's Moon mission really a success?



Chandrayaan-2 taking offImage copyright
Isro

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The mission's launch was broadcast live on TV to an audience of hundreds of millions

India's Moon lander, which lost contact with scientists seconds before it touched down on the lunar surface, is yet to be located. But scientists tell BBC Hindi's Imran Qureshi why the ambitious mission cannot be dismissed as a failure.

Millions of Indians watched Vikram Moon Lander's final heart-stopping descent in the early hours of September 7 – its progress was beamed across television screens and social media accounts.

But during the final stage – known as the "hovering" stage – a problem occurred. The lander was about 2.1km (1.3 miles) from the lunar surface when it lost contact with scientists, dashing hopes that India would become only the fourth country to achieve a soft landing on the Moon.

Since then, the US space agency Nasa has said the lander made a "hard landing". New pictures from a NASA spacecraft show targeted landing site – but they were taken at dusk, and unable to locate the lander.

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NASA

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Nasa tweeted images of the targeted landing site

Chandrayaan-2 was the most complex mission ever attempted by India's space agency, Isro. Its chairman K Sivan – who had previously described the final descent as "15 minutes of terror" – has since said the mission was "98% successful", based on the findings of an official committee.

Mr Sivan's remarks have been met with criticism from scientists who said it was too early for Isro to term the mission a success, especially since its most important goal – to land a rover on the Moon's surface that could gather crucial data – remains unrealized.

Named after Vikram Sarabhai, the founder of Isro, the lander carried a 27kg rover with instruments to analyze the lunar soil.

If the lander had touched down at the precise target spot – between two large craters – the rover would have rolled over to the surface of the Moon and collected data and images back to Earth for analysis. It had the capacity to travel 500m from the lander in its 14-day life span.

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Media captionThe successful launch of India's Moon mission

Some former and current Isro scientists have however, supported Dr Sivan, and said it was unfair to call the mission a failure.

Speaking on the condition of anonymity, an Isro scientist told BBC Hindi that the success of a space mission has to be measured in terms of "the returns you get".

"We had a precise launch, the orbiter was maneuvered as anticipated which is a major part of the success and even the lander passed through all three phases except that in the last phase it did not function as per our expectations," he added.

He pointed out that they would now rely on the data they received from the orbiter. "The life of the orbiter has increased from one year to seven years because a lot of fuel was not consumed. We were lucky. If you are getting data for seven years from the orbiter, it means many technologies have worked."

Dr Madhavan Nair, former Isro chairman, said that "only a small portion of the mission" had failed, and although the lander had not made a soft landing, it had lost contact "very close to the surface of the moon."

He added that "weightage" must be given to each stage of the mission, and that all other stages – the launch, the precise orbiter placement in the Moon's orbit, and the separation of the lander from the orbiter – had been successful.

"Perhaps, we have had the finest picture of the surface of the Moon taken by the global community," he said.

A soft landing on another planetary body – a feat accomplished by just three other countries so far – would have been a huge technological breakthrough for Isro and India's space ambitions, according to science writer Pallava Bagla.

He adds that it would also have paved the way for future Indian missions to land on Mars, and opened up the possibility of India sending astronauts into space.

It appears Isro is already gearing up for that.

Dr Sivan told The Hindu newspaper, "By December 2021, the first Indian will be carried [into space] by our own rocket. Isro is working on that ".

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Media captionIs India's prime minister right when he calls his country a superpower?

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