Reassessment of crater production rate based on newly acquired lunar image data.

利用日本月球探测任务Kaguya和美国月球勘测轨道器新获得的图像数据，重温了20世纪80年代初产生的陨石坑生产函数，得出了现在到3 Gyr以前的陨石坑生产函数，与前人的研究结果基本一致。另一方面，我发现Neukum研究的阿波罗15号着陆点上的二次陨石坑的影响是不容忽视的，因此，有必要对3Gyr前之前的老区的陨石坑生产函数进行评估。

By using newly obtained image data acquired by Japanese lunar exploration mission, Kaguya, and Lunar Reconnaissance Orbiter (USA), I revisited a crater production function which has been produced in the early 1980s.As a result, newly obtained crater production function in the range from present to 3 Gyr ago corresponds approximately to previous research. On the other hand, I found that the effect of secondary crater on the Apollo 15 landing site that was researched by Neukum is not negligible, so, it is necessary to evaluate the crater production function of older area before than 3 Gyr ago.