{"title":"嫦娥六号着陆点米至百米尺度陨石坑和厘米级岩石的特征","authors":"Chenxu Zhao, Zhaoqin Liu, Kaichang Di, Sheng Gou, Zongyu Yue, Wenzhe Fa, Jia Wang, Guolin Hu, Ziqing Cheng, Biao Wang, Wenhui Wan, Man Peng, Bin Xie, Yuke Kou","doi":"10.1029/2025JE008960","DOIUrl":null,"url":null,"abstract":"<p>China's Chang'e-6 (CE-6) probe successfully landed in the Apollo Basin within the South Pole-Aitken Basin on 2 June 2024 (Beijing Time), and returned the first lunar farside samples in human history. The descent camera captured hundreds of high-resolution images during the descending and landing. High-resolution digital orthophoto map (DOM) and digital terrain model (DTM) were generated from these images. We created catalogs of meter-to-hectometer craters and centimeter-sized rocks from the generated DOMs and DTMs of 0.03 m/pixel (Map-1) and 0.3 m/pixel (Map-2) resolutions. The distribution and morphological characteristics of craters and rocks were analyzed, including completeness diameter, spatial density, crater type, depth/diameter ratio, and rock abundance. By recognizing and measuring concentric craters, we estimated a median regolith thickness of 1.85 m in the Map-2 area. The relatively thin lunar regolith resulted in most craters reaching the high-strength substrate during the cratering process, which is the primary reason for the lower depth/diameter ratio (0.116) of the fresh CE-6 crater compared with other landing areas (e.g., 0.15 at CE-5 landing site). Size analysis of the rocks revealed that the CE-6 landing site has a rock abundance of 0.179%, which is close to the value (0.21%) of the CE-4 landing site. Based on the ejecta thickness model and diffusion function, we found that the ejecta from a relatively fresh 4.7 m diameter crater is likely to be present in the uppermost layer of the sampling location. The data set generated in this study is publicly available at https://doi.org/10.5281/zenodo.14920942.</p>","PeriodicalId":16101,"journal":{"name":"Journal of Geophysical Research: Planets","volume":"130 10","pages":""},"PeriodicalIF":4.0000,"publicationDate":"2025-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Characterization of Meter-to Hectometer-Scale Craters and Centimeter-Sized Rocks in the Chang'e-6 Landing Site Measured From Descent Imagery\",\"authors\":\"Chenxu Zhao, Zhaoqin Liu, Kaichang Di, Sheng Gou, Zongyu Yue, Wenzhe Fa, Jia Wang, Guolin Hu, Ziqing Cheng, Biao Wang, Wenhui Wan, Man Peng, Bin Xie, Yuke Kou\",\"doi\":\"10.1029/2025JE008960\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<p>China's Chang'e-6 (CE-6) probe successfully landed in the Apollo Basin within the South Pole-Aitken Basin on 2 June 2024 (Beijing Time), and returned the first lunar farside samples in human history. The descent camera captured hundreds of high-resolution images during the descending and landing. High-resolution digital orthophoto map (DOM) and digital terrain model (DTM) were generated from these images. We created catalogs of meter-to-hectometer craters and centimeter-sized rocks from the generated DOMs and DTMs of 0.03 m/pixel (Map-1) and 0.3 m/pixel (Map-2) resolutions. The distribution and morphological characteristics of craters and rocks were analyzed, including completeness diameter, spatial density, crater type, depth/diameter ratio, and rock abundance. By recognizing and measuring concentric craters, we estimated a median regolith thickness of 1.85 m in the Map-2 area. The relatively thin lunar regolith resulted in most craters reaching the high-strength substrate during the cratering process, which is the primary reason for the lower depth/diameter ratio (0.116) of the fresh CE-6 crater compared with other landing areas (e.g., 0.15 at CE-5 landing site). Size analysis of the rocks revealed that the CE-6 landing site has a rock abundance of 0.179%, which is close to the value (0.21%) of the CE-4 landing site. Based on the ejecta thickness model and diffusion function, we found that the ejecta from a relatively fresh 4.7 m diameter crater is likely to be present in the uppermost layer of the sampling location. The data set generated in this study is publicly available at https://doi.org/10.5281/zenodo.14920942.</p>\",\"PeriodicalId\":16101,\"journal\":{\"name\":\"Journal of Geophysical Research: Planets\",\"volume\":\"130 10\",\"pages\":\"\"},\"PeriodicalIF\":4.0000,\"publicationDate\":\"2025-10-07\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Journal of Geophysical Research: Planets\",\"FirstCategoryId\":\"89\",\"ListUrlMain\":\"https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2025JE008960\",\"RegionNum\":1,\"RegionCategory\":\"地球科学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q1\",\"JCRName\":\"GEOCHEMISTRY & GEOPHYSICS\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Geophysical Research: Planets","FirstCategoryId":"89","ListUrlMain":"https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2025JE008960","RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"GEOCHEMISTRY & GEOPHYSICS","Score":null,"Total":0}
Characterization of Meter-to Hectometer-Scale Craters and Centimeter-Sized Rocks in the Chang'e-6 Landing Site Measured From Descent Imagery
China's Chang'e-6 (CE-6) probe successfully landed in the Apollo Basin within the South Pole-Aitken Basin on 2 June 2024 (Beijing Time), and returned the first lunar farside samples in human history. The descent camera captured hundreds of high-resolution images during the descending and landing. High-resolution digital orthophoto map (DOM) and digital terrain model (DTM) were generated from these images. We created catalogs of meter-to-hectometer craters and centimeter-sized rocks from the generated DOMs and DTMs of 0.03 m/pixel (Map-1) and 0.3 m/pixel (Map-2) resolutions. The distribution and morphological characteristics of craters and rocks were analyzed, including completeness diameter, spatial density, crater type, depth/diameter ratio, and rock abundance. By recognizing and measuring concentric craters, we estimated a median regolith thickness of 1.85 m in the Map-2 area. The relatively thin lunar regolith resulted in most craters reaching the high-strength substrate during the cratering process, which is the primary reason for the lower depth/diameter ratio (0.116) of the fresh CE-6 crater compared with other landing areas (e.g., 0.15 at CE-5 landing site). Size analysis of the rocks revealed that the CE-6 landing site has a rock abundance of 0.179%, which is close to the value (0.21%) of the CE-4 landing site. Based on the ejecta thickness model and diffusion function, we found that the ejecta from a relatively fresh 4.7 m diameter crater is likely to be present in the uppermost layer of the sampling location. The data set generated in this study is publicly available at https://doi.org/10.5281/zenodo.14920942.
期刊介绍:
The Journal of Geophysical Research Planets is dedicated to the publication of new and original research in the broad field of planetary science. Manuscripts concerning planetary geology, geophysics, geochemistry, atmospheres, and dynamics are appropriate for the journal when they increase knowledge about the processes that affect Solar System objects. Manuscripts concerning other planetary systems, exoplanets or Earth are welcome when presented in a comparative planetology perspective. Studies in the field of astrobiology will be considered when they have immediate consequences for the interpretation of planetary data. JGR: Planets does not publish manuscripts that deal with future missions and instrumentation, nor those that are primarily of an engineering interest. Instrument, calibration or data processing papers may be appropriate for the journal, but only when accompanied by scientific analysis and interpretation that increases understanding of the studied object. A manuscript that describes a new method or technique would be acceptable for JGR: Planets if it contained new and relevant scientific results obtained using the method. Review articles are generally not appropriate for JGR: Planets, but they may be considered if they form an integral part of a special issue.