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Day Has Returned, but India's Lander and Rover have Failed to Wake Up

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It looks like India’s Chandrayaan-3 succumbed to the cold, and its mission is over. The frigid lunar night lasted about two weeks, and a new day has dawned. With that day came hopes of a sunlit revival for the lander and the rover, but the India Space Research Organization (ISRO) says the chances of the spacecraft awakening in the Sun are diminishing by the hour.

The lunar night that wrapped its cold arms around the lander and rover lasted 14 days, and so will the current lunar day. When the day dawned last Friday, ISRO began trying to communicate with the lander. There’s been no response so far, as both explorers may be forever entombed about 600km (373 mi) from the Moon’s south pole.

Even though things don’t look good for the mission, it’s still a success. It’s the first spacecraft to land in the Moon’s south pole region. The area is critical because it contains vast quantities of frozen water in its permanently shadowed crater. That water is a valuable resource for astronauts who’ll visit the Moon in the future and set up bases. It’s also the first time ISRO successfully landed a rover and lander on the Moon after its predecessor, Chandrayaan-2, crashed into the surface.

But it’s encouraging that Vikram and Pragyaan are still intact. ISRO hoped that the Sun would bring both back to life after the agency put them into sleep mode as night fell. There’s a chance that the sunlight would recharge the batteries.

“Once there is sufficient solar generation, they are expected to come back to life provided that they have survived the night.” M Srikanth, Chandrayaan-3 Mission Operations Director.

ISRO released an update on Friday, the beginning of the new lunar day. Unfortunately, there was no response from either the lander or the rover.

https://twitter.com/isro/status/1705209835783078092

When night falls on the Moon’s south pole, temperatures plummet as low as -200C to -250C (-328F to -418F.) The lander and rover were never designed to handle these temperatures. The rover has only a small battery—10 amp-hours—that provides the necessary power to deploy its solar array. It was also included to help the rover survive a periodic eclipse. The small battery was fully charged when night came, and the solar panels were positioned to receive incoming starlight when morning came. The Vikram lander was also ready for the morning, and its 62.5 amp hour was fully charged.

Both vehicles are pre-programmed to come back to life as the Sun reappears. “When sunlight comes back, there’s an autonomous logic pre-loaded on both the lander and rover,” said M Srikanth, Chandrayaan-3 Mission Operations Director, in an interview with the Times of India. “Once there is sufficient solar generation, they are expected to come back to life provided that they have survived the night.”

If ISRO’s Chandrayaan-3 mission is truly over, it was still a success. It was the first spacecraft to land at the Moon’s south pole region. Image Credit: ISRO

But according to Isro chief AS Kiran Kumar, the “chances of reawakening are dimming with each passing hour.” In an interview with the BBC, Kumar added, “The lander and rover have so many components which may not have survived the frigid temperatures on the Moon.” In fairness, they were never designed to.

It’s all up to the lander’s transmitter now. It’s ISRO’s link with the mission, and if it won’t function, it won’t matter if some of the spacecraft’s other systems are somehow still working. “It has to tell us that it’s alive. Even if all other sub-systems work, we have no way of knowing that,” Kumar added.

Some of ISRO’s hopefulness is based on China’s successful Chang’e 4 mission. It landed on the lunar far side and was plunged into darkness and freezing temperatures, too. It woke up with the sunrise more than once.

There’s still a tiny shred of hope, but it looks like Chandrayaan 3 is done.


Source: https://www.universetoday.com/articles/day-has-returned-but-indias-lander-and-rover-have-failed-to-wake-up


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