Archive for ‘Chang’e-4’

17/04/2020

China’s Chang’e-4 probe resumes work for 17th lunar day

BEIJING, April 17 (Xinhua) — The lander and rover of the Chang’e-4 probe have resumed work for the 17th lunar day on the far side of the moon after “sleeping” during the extremely cold night.

The lander woke up at 1:24 p.m. Friday (Beijing time), and the rover awoke at 8:57 p.m. Thursday. Both are in normal working order, according to the Lunar Exploration and Space Program Center of the China National Space Administration.

The Chang’e-4 probe, launched on Dec. 8, 2018, made the first-ever soft landing on the Von Karman Crater in the South Pole-Aitken Basin on the far side of the moon on Jan. 3, 2019.

A lunar day equals 14 days on Earth, and a lunar night is the same length. The Chang’e-4 probe, switching to dormant mode during the lunar night due to the lack of solar power, has survived about 470 Earth days on the moon.

The rover Yutu-2, or Jade Rabbit-2, has worked much longer than its three-month design life, becoming the longest-working lunar rover on the moon.

Carrying scientific instruments such as panoramic camera, lunar penetrating radar, infrared imaging spectrometer and neutral atom detector, the rover will continue to move northwest to conduct scientific detection.

The scientific tasks of the Chang’e-4 mission include conducting low-frequency radio astronomical observation, surveying the terrain and landforms, detecting the mineral composition and shallow lunar surface structure and measuring neutron radiation and neutral atoms.

The Chang’e-4 mission embodies China’s hope to combine wisdom in space exploration with four payloads developed by the Netherlands, Germany, Sweden and Saudi Arabia.

Source: Xinhua

21/02/2019

Xi meets Chang’e-4 mission representatives

CHINA-BEIJING-XI JINPING-CHANG'E-4 MISSION-REPRESENTATIVES-MEETING (CN)

Chinese President Xi Jinping, also general secretary of the Communist Party of China Central Committee and chairman of the Central Military Commission, delivers a speech as he meets representatives of space scientists and engineers who participated in the research and development of the Chang’e-4 mission at the Great Hall of the People in Beijing, capital of China, Feb. 20, 2019. (Xinhua/Ju Peng)

BEIJING, Feb. 20 (Xinhua) — Chinese President Xi Jinping met representatives of space scientists and engineers who participated in the research and development of the Chang’e-4 mission at the Great Hall of the People in Beijing Wednesday afternoon.

Xi, also general secretary of the Communist Party of China (CPC) Central Committee and chairman of the Central Military Commission, noted that there is no end for space exploration.

Xi called on science and technology workers and space engineers in China to ride on the wave of the Chang’e-4 mission to achieve the general goal of China’s lunar project, make more efforts to push forward the international aerospace cause and bring more Chinese wisdom, solutions and force to the peaceful use of space and the building of a community with a shared future for humanity.

Members of the Standing Committee of the Political Bureau of the CPC Central Committee Li Keqiang, Li Zhanshu, Wang Yang, Wang Huning, Zhao Leji and Han Zheng also attended the meeting.

Xi shook hands with the scientists and engineers, inquired about their work and life and took pictures with them.

In a speech addressing the meeting, Xi first extended his sincere regards to all those who have made historic contributions to the country’s space undertakings and expressed warm congratulations to all those who have contributed to the Chang’e-4 mission eminently.

“Your outstanding feats achieved in mounting the science and technology peak and exploring the universe’s mysteries have set a model for the whole Party, the whole armed forces and people of all ethnic groups in China to strive for a new era and start a new journey, for which our country and people thank you,” Xi said.

“Five years ago, we celebrated the success of the Chang’e-3 mission. Five years later, we are here to celebrate the success of the Chang’e-4 mission,” he said.

He pointed out that the Chang’e-4 mission, by adhering to independent, collaborative and open innovations, has realized the first-ever patrol and exploration on the far side of the moon by a human spacecraft and engraved Chinese “footprints” there for the first time.

“It is another vivid practice of exploring to establish a new institution that can pool the resources of the whole country,” Xi said.

“Experience tells us that great undertakings begin with dreams, and dreams are the source of vitality. China is a nation that pursues dreams bravely. The CPC Central Committee’s decision to implement the lunar exploration project is to pursue the nation’s unyielding dream of flying into the sky and reaching for the moon,” he noted.

Each bold idea and its successful implementation in lunar exploration is a full demonstration of the human capacity to gain knowledge of and utilize a celestial body, he said.

“In the journey of building a great modern socialist country and realizing the great rejuvenation of the Chinese nation, every industry and every person should dream and strive courageously and fulfill their dreams with arduous and continuous efforts, step by step and baton by baton just like in a relay race,” he emphasized.

“Experience tells us that great undertakings are based on innovation, and innovation determines the future. It won’t be a smooth path to build a leading nation in science and technology, and only innovation can help gain advantages,” he said.

“The mission has made multiple innovations come true and filled a series of international and domestic gaps, which has fully displayed the innovative spirit just as making the first move in chess or taking the initiative in battle,” he added.

China should have a grasp of the general trend of the science and technology development in the world, foster respect for science and focus on strategic, basic and pioneering sectors, said Xi.

China should shore up its weakness in certain areas, keep pace with the leaders in some areas, and strive to lead in other areas, aim for significant breakthroughs in core and key technologies, improve the overall efficiency of the national innovation system, boost science and technology strength and innovation ability, in a bid to earn itself a spot in the global hi-tech sector, he said.

“Experience tells us that great undertakings succeed in solid work,” Xi noted. He said China need to encourage more prominent scientists, leading talent, young scientists and innovation teams to lead the trend and work hard to realize the value of life by contributing to the nation’s great undertakings.

Xi pointed out that exploring the vast universe is a common dream of all humankind. China has been actively advancing international space cooperation and carried out productive cooperation with multiple countries and international organizations. The complete success of the Chang’e-4 mission, for instance, includes contributions of many countries.

China is willing to work with countries around the world and follow the principle of achieving shared growth through discussion and collaboration, so as to deepen the international exchanges on basic scientific research, boost big science projects and step up opening-up and cooperation to enhance innovation ability and push forward the development of science.

The Chang’e-4 mission had two launches. The relay satellite, named Queqiao, meaning Magpie Bridge, was launched on May 21, 2018. The Chang’e-4 probe, launched from the Xichang Satellite Launch Center in southwest China on Dec. 8, 2018, touched down on the far side of the moon on Jan. 3.

Scientific research involving multiple countries and international organizations has been carried out.

The complete success of Chang’e-4 mission marks the first-ever international organizations, patrol and exploration on the far side of the moon by a spacecraft, the first communication link between Earth and the far side of the moon and the first footprints there in the history of lunar exploration, which unveils its mysteries and opens a new chapter in mankind’s exploration of the universe.

Source: Xinhua

12/01/2019

Chang’e-4: China Moon probes take snaps of each other

  • 11 January 2019
Lunar roverImage copyrightCLEP
Image captionAn image of the rover taken with the lander’s terrain camera (TCAM)

A Chinese rover and lander have taken images of each other on the Moon’s surface.

The Chinese space agency says the spacecraft are in good working order after touching down on the lunar far side on 3 January.

Also released are new panoramic images of the landing site, along with video of the vehicles touching down.

The rover and lander are carrying instruments to analyse the region’s geology.

The Chang’e-4 mission is the first to explore the Moon’s far side from the surface.

Chang'e-4 landerImage copyrightCLEP
Image captionA picture of the lander taken by the rover’s panoramic camera (PCAM)

The rover has just awoken from a period on “standby”.

Controllers placed it in this mode shortly after the touchdown as a precaution against high temperatures, as the Sun rose to its highest point over the landing site.

Those temperatures were expected to reach around 200C. But the Chinese Lunar Exploration Program (CLEP) said that as of the morning of 11 January, the Yutu 2 rover, its lander and the relay satellite were all in a “stable condition”.

PanoramaImage copyrightCLEP
Image captionPart of the cylinder projection of Von Kármán crater from one of the lander’s cameras
Azimuth projectionImage copyrightCLEP
Image captionAzimuth projection of the landing site from one of the cameras on Chang’e-4’s lander

The panoramic images show parts of the static lander and the Yutu 2 (“jade rabbit”) rover, which is now exploring the landing site in Von Kármán crater.

CLEP, which released the images, said in a statement: “Researchers completed the preliminary analysis of the lunar surface topography around the landing site based on the image taken by the landing camera.”

In contrast with previous images from the landing site, the panoramic image has been colour-corrected by Chinese researchers to better reflect the colours we would see if we were standing there.

Online commentators had pointed out that these earlier, unprocessed images made the lunar landscape look reddish – a far cry from the gunpowder grey landscapes familiar from other missions to the surface.

rover
Image captionRaw images made the lunar surface appear red; the new images have been calibrated

In an article for The Conversation, Prof Dave Rothery, from the Open University in Milton Keynes, observed: “In the raw version, the lunar surface looks red because the detectors used were more sensitive to red than they were to blue or green.”

Chang’e-4 was launched from Xichang Satellite Launch Centre in China on 7 December. It touched down at 10:26 Beijing time (02:26 GMT) on 3 January.

Because of a phenomenon called “tidal locking”, we see only one face of the Moon from Earth. This is because the Moon takes just as long to rotate on its own axis as it takes to complete one orbit of Earth.

The far side is more rugged, with a thicker, older crust that is pocked with more craters. There are also very few of the “maria” – dark basaltic “seas” created by lava flows – that are evident on the more familiar near side.

Because there’s no way to establish a direct radio link to Earth from the far side, the spacecraft must bounce data off a relay satellite, called Queqiao (or magpie bridge), which orbits 65,000km beyond the Moon, around a so-called Lagrange point.

CLEP said: “The ground receiving image was clear and intact, the Chinese and foreign scientific loads were working normally, and the detection data was valid.”

Space News reported that the rover would be put into a dormant state on 12 January, to coincide with the lunar night-time, when temperatures could drop to around -180C.

During this time, the rover would have limited functions.

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