China News Service, Beijing, January 22 (Guo Chaokai) A reporter learned from the China National Space Administration's Lunar Exploration and Space Engineering Center on the 22nd that the Chang'e 4 lander and the "Yutu 2" lunar rover were held at 21:10 on January 20. The 26th month and day work was completed at 14:06, and the setting was completed according to the ground instructions, and the moon night sleep was entered.

Up to now, the Chang'e 4 lander and the "Yutu-2" lunar rover have worked on the moon for 749 Earth days, and the "Yutu-2" lunar rover has a cumulative mileage of 628.47 meters.

　　Based on the first-hand data obtained by the Chang'e-4 mission, the scientific research team continues to achieve scientific results.

The team of Wu Yunzhao, a researcher at the Purple Mountain Observatory of the Chinese Academy of Sciences, took a different approach and used the visible near-infrared spectrometer (VNIS) to study the thermal radiation characteristics. The micro-scale thermal radiation characteristics of the moon were obtained, and the spectrum was thermally corrected. Related results were published In Geophysical Research Letters.

　　Wu Yunzhao first discovered the existence of thermal radiation in the spectral data of Chang'e-3.

The first-month diurnal spectrum data of Chang'e-4 confirmed this discovery, and the tenth day fixed-point measurement provided more observational support.

The study found that after 2 μm, the spectral uplift gradually strengthened as the sun rose, and gradually decreased as the sun sinks.

On the one hand, this discovery helps to interpret spectral data correctly, and on the other hand, it expands the application of spectrometers, not only for studying minerals, but also for studying the thermal radiation of the moon.

This study shows that even in the 2μm and mid-latitude region mineral inversion studies require thermal correction.

　　In the past, the research on the temperature characteristics of the lunar surface was mainly based on macro-satellite remote sensing data, and the wavelength was in the thermal infrared band.

This research is the first to conduct research on the thermal radiation characteristics of the lunar soil on the micro-scale and shortwave, which is of great significance for mid-infrared research.

The spectrum used in the research has the superposition of solar reflection and the moon's own thermal radiation, and there are great difficulties in spectral analysis and application, and it is a spectral region with relatively few studies.

The mid-infrared spectrum is very useful. Water, OH, organic matter, and minerals have discriminative spectral characteristics in the mid-infrared, and they are the key spectrum for detecting extraterrestrial life substances.

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