China puts Jade Rabbit rover on Moon

Lunar surfaceA camera on the landing module showed the craft’s descent to the surface

China says it has successfully landed a craft carrying a robotic rover on the surface of the Moon, a major step in its programme of space exploration.

On Saturday afternoon (GMT), a landing module underwent a powered descent, using thrusters to perform the first soft landing on the Moon in 37 years.

Several hours later, the lander will deploy a robotic rover called Yutu, which translates as “Jade Rabbit”.

The touchdown took place on a flat plain called the Bay of Rainbows.

The mission launched on a Chinese-developed Long March 3B rocket on 1 December from Xichang in the country’s south.



China's space mission team celebrate after the landing

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China’s space mission team celebrate after the landing

The Chang’e-3 craft began its descent just after 1300 GMT (2100 Beijing time), with state television showing pictures of the moon’s surface as the lander touched down.

Staff at mission control in Beijing were shown clapping and celebrating after confirmation came through. The official Xinhua news service reported that the spacecraft reached the surface at 1312 GMT after hovering above the surface for several minutes finding an appropriate place to land.

The task was described as the mission’s “most difficult” in a post on Sina Weibo, the Chinese version of Twitter, which had been written by the Chinese Academy of Sciences on behalf of the space authorities.

It is the third robotic rover mission to land on the lunar surface, but the Chinese vehicle carries a more sophisticated payload, including ground-penetrating radar which will gather measurements of the lunar soil and crust.

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China is saying: ‘We are doing something that only two other countries have done before – the US and the Soviet Union”

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Dean Cheng
Heritage Foundation

“It’s still a significant technological challenge to land on another world,” said Peter Bond, consultant editor for Jane’s Space Systems and Industry told the AP news agency.

“You have to use rocket motors for the descent and you have to make sure you go down at the right angle and the right rate of descent and you don’t end up in a crater on top of a large rock.”

According to translated documents, the landing module was to actively reduce its speed at about 15km from the Moon’s surface.

When it reached a distance of 100m from the surface, the craft fired thrusters to slow its descent.

At a distance of 4m, the lander switched off the thrusters and fell to the lunar surface.

The Jade Rabbit was expected to be deployed several hours after touchdown, driving down a ramp lowered by the landing module.

Infographic

Reports suggest the lander and rover will photograph each other at some point on Sunday.

According to Chinese space scientists, the mission is designed to test new technologies, gather scientific data and build intellectual expertise.

The 120kg (260lb) Jade Rabbit rover can reportedly climb slopes of up to 30 degrees and travel at 200m (660ft) per hour.

Its name – chosen in an online poll of 3.4 million voters – derives from an ancient Chinese myth about a rabbit living on the moon as the pet of the lunar goddess Chang’e.

Dean Cheng, a senior research fellow at the Heritage Foundation, a conservative think-tank in Washington DC, said China’s space programme was a good fit with China’s concept of “comprehensive national power”. This might be described as a measure of a state’s all-round capabilities.



View from launch platform as China's Chang'e-3 mission lifts off

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The Chang’e-3 mission launches from Xichang, south China

Space exploration was, he told BBC News, “a reflection of your economic power, because you need spare resources to have a space programme. It clearly has military implications because so much space technology is dual use”.

He added: “It reflects your scientific and technological capabilities, it supports your diplomacy by making you appear strong.

“China is saying: ‘We are doing something that only two other countries have done before – the US and the Soviet Union.”

Mr Cheng explained that the mission would provide an opportunity to test China’s deep-space tracking and communications capability.

“The rover will reportedly be under Earth control at various points of its manoeuvres on the lunar surface,” Mr Cheng wrote in a blog post.

“Such a space observation and tracking system has implications not only for space exploration but for national security, as it can be used to maintain space surveillance, keeping watch over Chinese and other nations’ space assets.”

MoonThe Jade Rabbit, seen in this artist’s impression, is the first wheeled vehicle on the Moon since the 1970s

China has been methodically and patiently building up the key elements needed for an advanced space programme – from launchers to manned missions in Earth orbit to unmanned planetary craft – and it is investing heavily.

The lander’s target is Sinus Iridum (Latin for Bay of Rainbows) a flat volcanic plain thought to be relatively clear of large rocks. It is part of a larger feature known as Mare Imbrium that forms the right eye of the “Man in the Moon”.

After this, a mission to bring samples of lunar soil back to Earth is planned for 2017. And this may set the stage for further robotic missions, and – perhaps – a crewed lunar mission in the 2020s.

“[Chang’e-3] is probably laying some of the groundwork for a manned mission,” said Mr Cheng.

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