Chang'e 4

Chang'e 4 is a lunar mission conducted by the China National Space Administration, which includes a lunar lander and a lunar rover. The mission is part of the Chinese Lunar Exploration Program and is named after the Chinese moon goddess Chang'e. The spacecraft was launched from the Xichang Satellite Launch Center using a Long March 3B rocket and entered into lunar orbit before landing on the Moon. The mission involves collaboration with various international partners, including the German Aerospace Center, Swedish Institute of Space Physics, and Austria.

Overview

The Chang'e 4 mission is a significant milestone in the Chinese space program, marking the first time a spacecraft has landed on the far side of the Moon. The mission builds upon the success of previous Chinese lunar missions, including Chang'e 1 and Chang'e 3. The spacecraft is equipped with a range of scientific instruments, including a laser ranging instrument developed by the University of Science and Technology of China, a low-frequency radio spectrometer developed by the Chinese Academy of Sciences, and a neutral atom detector developed by the Swedish Institute of Space Physics. The mission also involves the use of a Queqiao relay satellite, which was launched in May 2018 and is positioned in a halo orbit around the Earth-Moon L2 point.

Spacecraft Design

The Chang'e 4 spacecraft consists of a lunar lander and a lunar rover, which are designed to work together to conduct scientific experiments on the lunar surface. The lander is equipped with a range of instruments, including a panoramic camera developed by the Beijing Institute of Technology, a lunar penetrating radar developed by the Chinese Academy of Sciences, and a laser-induced breakdown spectroscopy instrument developed by the University of Science and Technology of China. The rover is equipped with a range of instruments, including a ground-penetrating radar developed by the German Aerospace Center, a visible and near-infrared hyperspectral imager developed by the Chinese Academy of Sciences, and a radon detector developed by the Austrian Academy of Sciences.

Mission Objectives

The primary objectives of the Chang'e 4 mission are to conduct scientific experiments on the lunar surface and to test the technology required for future lunar missions. The mission involves a range of scientific experiments, including the study of the lunar regolith, the lunar exosphere, and the lunar magnetic field. The mission also involves the use of a range of scientific instruments, including a seismometer developed by the French National Center for Scientific Research, a heat flow instrument developed by the Chinese Academy of Sciences, and a dosimeter developed by the Kiel University. The mission is also designed to test the technology required for future lunar missions, including the use of a lunar lander and a lunar rover.

Launch and Transit

The Chang'e 4 spacecraft was launched from the Xichang Satellite Launch Center using a Long March 3B rocket on December 7, 2018. The spacecraft entered into lunar orbit on December 12, 2018, and began to prepare for landing on the Moon. The spacecraft used a range of trajectory correction maneuvers to adjust its orbit and ensure a precise landing on the lunar surface. The spacecraft also used a range of navigation systems, including a star tracker developed by the Chinese Academy of Sciences and a laser altimeter developed by the University of Science and Technology of China.

Lunar Surface Operations

The Chang'e 4 spacecraft landed on the Moon on January 3, 2019, in the South Pole-Aitken basin. The landing site was selected based on a range of factors, including the geological characteristics of the area and the availability of sunlight. The spacecraft used a range of hazard avoidance systems to ensure a safe landing, including a laser altimeter developed by the University of Science and Technology of China and a terrain relative navigation system developed by the Chinese Academy of Sciences. The spacecraft began to conduct scientific experiments on the lunar surface shortly after landing, using a range of instruments including a seismometer developed by the French National Center for Scientific Research and a heat flow instrument developed by the Chinese Academy of Sciences.

Results and Legacy

The Chang'e 4 mission has achieved a range of significant results, including the first-ever landing on the far side of the Moon and the deployment of a range of scientific instruments on the lunar surface. The mission has also provided a range of new insights into the geology and composition of the Moon, including the discovery of water ice in the South Pole-Aitken basin. The mission has also demonstrated the feasibility of using a lunar lander and a lunar rover to conduct scientific experiments on the lunar surface. The mission is also expected to pave the way for future lunar missions, including the Chang'e 6 and Chang'e 7 missions, which are planned to launch in the coming years. The mission has involved collaboration with a range of international partners, including the European Space Agency, the NASA, and the Russian Federal Space Agency.