Change-4 completed its day work in the 23rd month, marking the 13th anniversary of the launch of Change-1

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 Change-4 completed its day work in the 23rd month, marking the 13th anniversary of the launch of Change-1


Recent basalt coverage (red line area)

Based on the data of panoramic camera mosaic image and DOM image in the 22nd month, yutu-2 lunar rover successively drove to the basalt distribution area and the impact crater area with high reflectivity during the day of the 23rd month, both of which are located in the northwest of the lunar rover. In this route, an infrared imaging spectrometer was used to detect a rock mass with a diameter of about 30 cm. The research team is in-depth research on the detection data.

During the 23 months of scientific exploration, the neutron and radiation dose detector on the surface of the lander has carried out the first international on-the-spot particle radiation environment detection on the lunar surface, and obtained precious first-hand scientific data. The research results were published in the journal Science advance.

Installation position of lunar neutron and radiation dose detector on Lander

The neutron and radiation dose detector on the lunar surface can measure the total radiation dose of particles, the radiation dose of neutral particles, the let spectrum of particle radiation, neutrons and charged particles. The measured results show that the radiation dose rate of particles near the landing area is 13.2 ugy / h (SI), and the dose equivalent is twice that of the surface of Mars and the interior of the space station, 5 to 10 times that of a flight, and 300 times that of the earths surface (Beijing).

The measured radiation dose on the lunar surface (horizontal axis is the world time, and the vertical axis is: a total radiation dose rate in silicon (microgy / hour), B. radiation dose rate of neutral particles in silicon (microgy / hour), C. radiation dose rate of charged particles in silicon (microgery / hour), D. cosmic ray penetration particle flux (PCS / cm2 u00b7 h u00b7 radian)

These field measurements provide important radiation environment parameters for the follow-up lunar exploration in China. The payload also distinguishes the radiation dose of charged particles and neutral particles, thus providing more accurate radiation physical quantities, which can serve the radiation protection of future astronauts.

Today in space history:

On October 24, 2007, Change-1, Chinas first lunar exploration satellite, was successfully launched from the Xichang Satellite Launch Center by the long march 3A carrier rocket, which started the glorious course of Chinas lunar exploration project. On November 12, 2008, the image of the whole moon taken by Change-1 was released. On March 1, 2009, the satellite collided with the moon as scheduled. After the implementation of Chinas manned space club, Chinas third manned space exploration mission has set a milestone.

On October 24, 2014, Chinas first lunar high-speed reentry vehicle was launched from the long march-3c-ii carrier rocket at Xichang Satellite Launch Center, and it will circle the moon three days later. On November 1, the reentrant landed in Siziwang Banner, Ulanqab City, Inner Mongolia, China. As the third phase of the lunar exploration project, the key technologies of lunar sampling return are verified, which lays a solid foundation for lunar sampling return.

Schematic diagram of reentry return test track

The source of this article is the China Lunar Exploration Project, the official account of WeChat public: Qiao Jun Jing. NBJ11279