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Wednesday, December 12, 2018, 23:28
China's Chang'e-4 probe enters lunar orbit
By Xinhua
Wednesday, December 12, 2018, 23:28 By Xinhua

In this Aug 15, 2018 photo, the design of China's moon lander and rover, developed by China Aerospace Science and Technology Group Co., Ltd, for the Chang'e-4 lunar probe is unveiled in Beijing, capital of China. (NATIONAL DEFENSE SCIENCE AND TECHNOLOGY BUREAU / XINHUA)

BEIJING - China's Chang'e-4 probe decelerated and entered the lunar orbit Wednesday, completing a vital step on its way to make the first-ever soft landing on the far side of the moon, the China National Space Administration (CNSA) announced.

Afterward, the control center will choose a proper time to land the probe on the far side of the moon, according to CNSA

After flying about 110 hours from earth, an engine on the probe was ignited when it was 129 km above the surface of the moon, in line with instructions sent from a control center in Beijing at 4:39 pm, and then the probe slowed and entered an elliptical lunar orbit with the perilune at about 100 km at 4:45 pm, said CNSA.

The probe, including a lander and a rover, was launched by a Long March-3B carrier rocket last Saturday from the Xichang Satellite Launch Center in Southwest China's Sichuan province, opening a new chapter in lunar exploration.

READ MORE: Chinese module to study moon's far side

As the rocket was able to send the probe into orbit precisely as planned, the control center only adjusted the probe's orbit once on Sunday and also canceled two pre-planned orbit trimmings before the near-moon deceleration, CNSA said.

Next, the control center will adjust the probe's orbit around the moon and test the communication link between the probe and the relay satellite "Queqiao," which is operating in the halo orbit around the second Lagrangian (L2) point of the earth-moon system.

The Chang'e-4 mission will be a key step in revealing the mysterious far side of the moon

Afterward, the control center will choose a proper time to land the probe on the far side of the moon, according to CNSA.

Since the moon's revolution cycle is the same as its rotation cycle, the same side always faces the earth. The other face, most of which cannot be seen from earth, is called the far side or dark side, not because it's dark, but because most of it remains unknown.

ALSO READ: China to launch Chang'e-5 lunar probe in 2019

The Chang'e-4 mission will be a key step in revealing the mysterious far side of the moon.

The scientific tasks of the Chang'e-4 mission include low-frequency radio astronomical observation, surveying the terrain and landforms, detecting the mineral composition and shallow lunar surface structure, and measuring the neutron radiation and neutral atoms to study the environment on the far side of the moon, according to CNSA.

China has promoted international cooperation in its lunar exploration program, with four scientific payloads of the Chang'e-4 mission developed by scientists from the Netherlands, Germany, Sweden and Saudi Arabia.

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