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But former Indian space chief K. Sivan said the latest photos transmitted back home by the lander gave every indication the final leg of the voyage would succeed.
"It is giving some encouragement that we will be able to achieve the landing mission without any problem," he told AFP on Monday.
'Confidence'
Sivan added that the Indian Space Research Organisation (ISRO) had made corrections after the failure of four years ago, when scientists lost contact with the previous lunar module moments before its slated landing.
"Chandrayaan-3 is going to go with more ruggedness," he said. "We have confidence, and we expect that everything will go smoothly."
The mission was launched nearly six weeks ago in front of thousands of cheering spectators, but took much longer to reach the Moon than those of the Apollo missions in the 1960s and 1970s, which arrived in a matter of days.
India is using rockets much less powerful than those the United States used back then, meaning the probe must orbit Earth several times to gain speed before embarking on its month-long lunar trajectory.
The spacecraft's lander, Vikram, which means "valor" in Sanskrit, detached from its propulsion module last week and has been sending back images of the moon's surface since entering lunar orbit on August 5.
A day ahead of the landing, the ISRO said on social media the landing was proceeding on schedule and that its mission control complex was "buzzed with energy and excitement".
"Smooth sailing is continuing," the agency posted on X, formerly known as Twitter.
India has a comparatively low-budget aerospace program, but one that has grown considerably in size and momentum since it first sent a probe to orbit the Moon in 2008.
The latest mission comes with a price tag of $74.6 million—far lower than those of other countries, and a testament to India's frugal space engineering.
Experts say India can keep costs low by copying and adapting existing space technology, and thanks to an abundance of highly skilled engineers who earn a fraction of their foreign counterparts' wages.
In 2014, India became the first Asian nation to put a satellite into orbit around Mars and is slated to launch a three-day manned mission into Earth's orbit by next year.
'Very, very important'
Sivan, the former ISRO chief, said India's efforts to explore the relatively unmapped lunar south pole would make a "very, very important" contribution to scientific knowledge.
Only Russia, the United States and China have previously achieved a controlled landing on the lunar surface.
Russia launched its own lunar probe earlier in August—its first in nearly half a century.
If successful, it would have beaten Chandrayaan-3 by a matter of days to become the first mission of any nation to make a controlled landing around the lunar south pole.
But the Luna-25 probe crash-landed on Saturday after an unspecified incident as it was preparing for descent.
Punishing sanctions since the outset of the Ukraine war have affected Russia's space industry, which has also been beleaguered by corruption and a lack of innovation and partnerships.
© 2023 AFP