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India's Chandrayaan-2 Mission Will Take 7 Weeks to Reach the Moon — Here's Why

India's Chandrayaan-2 mission is now on its way to the moon, but it has a slow journey ahead: The rover and lander won't touch down until early September.

As the Apollo missions the U.S. spent the weekend commemorating prove, it doesn't necessarily have to take seven weeks to land on the moon. But the lander and rover of Chandrayaan-2 were scheduled to touch down Sept. 6 (Sept. 7 local time in mission control) — and that was before the launch was delayed nearly a week.

The slow, round-about route that Chandrayaan-2 will follow to reach the moon reflects the power of the Indian rocket used to launch the spacecraft, called the Geosynchronous Satellite Launch Vehicle Mark-III. That rocket doesn't carry the same amount of thrust as the giant Saturn V rockets that drove NASA's Apollo program — and no surprise, since those U.S. boosters were the most powerful rockets ever built. The Apollo missions were also designed to carry astronauts, while Chandrayaan-2 is a smaller, uncrewed mission.  

Related: The Science of India's Chandrayaan-2 Moon Mission

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This Indian Space Research Organisation diagram shows the flight profile of the Chandrayaan-2 spaceraft as they fly to the moon between July and September 2019.

This Indian Space Research Organisation diagram shows the flight profile of the Chandrayaan-2 spaceraft as they fly to the moon between July and September 2019. Chandrayaan-2 will take about seven weeks to reach the moon.
(Image credit: Indian Space Research Organisation)
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The Indian Space Research Organisation's Chandrayaan-2 spacecraft (bottom) and its Vikram lander (top) are prepared to be encapsulated by a payload fairing before being loaded on their Geosynchronous Satellite Launch Vehicle Mark III-M1 rocket for a July 2019 launch.

India's Chandrayaan-2 orbiter (bottom) and Vikram lander (top with legs) as seen during launch preparations.
(Image credit: India Space Research Organisation)
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The target landing site for India's Chandrayaan-2 mission to explore the lunar south pole.

ISRO's landing site for Chandrayaan-2's Vikram lander is near the south pole of the moon.
(Image credit: Indian Space Research Organisation)
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The Indian Space Research Organisation's Chandrayaan-2 moon orbiter, lander and rover launch into space atop a Geosynchronous Satellite Launch Vehicle Mark III-M1 rocket from the Satish Dhawan Space Centre on Sriharikota Island on July 22, 2019.

India launched a three-part moon mission called Chandrayaan-2 on July 22, 2019.
(Image credit: Indian Space Research Organisation)

So Chandrayaan-2 was always scheduled to spend a while orbiting Earth before transferring to lunar orbit. After the launch delay last week, engineers at the Indian Space Research Organisation (ISRO), which oversees the mission, adjusted the mission timeline to ensure the landing schedule wouldn't be seriously affected.

Keeping the landing time from slipping too far is important because the lander and rover aren't designed to withstand the bitterly cold lunar nights, which last the equivalent of two weeks here on Earth.

According to the mission's new schedule, Chandrayaan-2 will spend 23 days orbiting Earth, gradually raising its altitude on one side of an elliptical orbit around the planet. Then, in mid-August, it will turn its sights on the moon, completing a series of maneuvers to leave Earth orbit and begin circling the moon.

In order to accommodate the launch delay, Chandrayaan-2 will spend less time orbiting the moon than previously planned, according to the Hindustan Times

During the first week of September, the Chandrayaan-2 orbiter will release its Vikram lander, which will then descend to the surface, touching down just a bit later than the mission's original timetable called for. If all goes well, a rover called Pragyan, will then be deployed from the lander a few hours later.

When Vikram lander does land, it will do so near the moon's south pole, an area of particular interest to scientists and explorers because of its stash of water ice in permanently shaded craters. Several of the payloads on board both the lander and its companion rover designed to map and analyze this ice.

If Chandrayaan-2's flight and landing go smoothly, India will become the first country to reach the moon's south pole and only the fourth country to successfully land softly on the moon, after the former Soviet Union, United States and China.

Email Meghan Bartels at mbartels@space.com or follow her @meghanbartels. Follow us on Twitter @Spacedotcom and on Facebook. 

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