[P-PS02] 月の科学と探査

[PPS02-P05] Evaluating the thickness and stratigraphy of ejecta materials at the Chang’e-4 landing site

*Luyuan Xu¹、Xunyu Zhang¹、Le Qiao² (1.State Key Laboratory of Lunar and Planetary Sciences, Macau University of Science and Technology、2.Shandong Provincial Key Laboratory of Optical Astronomy and Solar-Terrestrial Environment, Shandong University, Weihai)

キーワード：Moon, Chang’e-4, impact ejecta

On 3rd January 2019, China’s Chang’e-4 (CE-4) lunar probe successfully landed on the Von Kármán crater on lunar far-side and deployed Yutu-2 rover. The Von Kármán crater is located in the highly-cratered terrain within the South Pole-Aitken (SPA), indicating the CE-4 landing site has experienced complex emplacement sequences of both near and distant ejecta materials. This complicates the interpretation of CE-4 surface in-situ measurements of the Visible and Near Infrared Spectrometer (VNIS) and Lunar Penetrating Radar (LPR) onboard Yutu-2 rover. In order to evaluate the sources and amounts of all considerable (> 10 cm in thickness) ejecta materials on the landing site of Chang’e-4, we thoroughly examine the ejecta delivered by all crater-forming events possibly occurred later than the formation of mare unit within Von Kármán crater in this study. We find a total of 20 craters throughout the Moon may deliver unneglectable ejecta (> 10 cm in thickness) superposed on the mare units of the landing site of Chang’e-4 and confirm that the ejecta from Finsen crater is the most dominant foreign materials, followed by the ejecta of Von Kármán L.