[P-PS08] 月の科学と探査

[PPS08-P05] 月面サンプルリターンに向けたその場サンプル選別の検討状況

*長岡 央¹、諸田 智克²、長 勇一郎²、仲内 悠祐¹、杉田 精司²、大竹 真紀子³、田畑 陽久⁴、鹿山 雅裕²、新原 隆史⁵、宮崎 理紗⁴、相田 真里⁴、与賀田 佳澄⁴、佐伯 和人¹、吉光 徹雄⁴、森 治⁴、佐伯 孝尚⁴ (1.立命館大学、2.東京大学、3.会津大学、4.JAXA、5.岡山理科大学)

キーワード：サンプルリターン、その場分析、始原地殻、衝突溶融岩

The Artemis program will promote to return samples from the Moon to advance important science of the Moon. For future sample return missions, we contribute to the following two scientific objectives: 1) To constrain on lunar formation conditions by the lunar magma ocean (LMO) and bulk silicate moon composition by returning primordial crust rocks, purest anorthosite (PAN) (Nagaoka et al. 2023 Icarus; Ohtake et al. 2009 Nature); 2) To reconstruct impact history in the early solar system and verify the late heavy bombardment hypothesis by returning impact melt rocks from i.e., the South Pole-Aitken (SPA) and Nectaris basins (Morota et al. 2024 LPSC). Our science objectives are well matched with Science Traceability Matrix (STM) of the Artemis Science Goals (ARTEMIS III Science definition team report (2020)):1. understanding planetary processes, 2. understand character and origin of lunar polar volatiles, 3. interpreting the impact history of the Earth-Moon system.

Appropriate sampling site of PAN and impact melt rock has been investigated with the remote sensing data, and their exposures locate at steep slopes and boulder dense locations around craters (Morota et al. 2024; Nagaoka et al. 2023). To return fresh samples from large boulders recently exposed from their outcrops (more than a few meters), in-situ analysis instruments to judge whether the boulder is our purpose, are required. In this presentation, current status of our sample selection plan with in-situ analyses are discussed.