日本地球惑星科学連合2022年大会

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[J] 口頭発表

セッション記号 P (宇宙惑星科学) » P-PS 惑星科学

[P-PS06] 月の科学と探査

2022年5月27日(金) 15:30 〜 17:00 301B (幕張メッセ国際会議場)

コンビーナ:西野 真木(宇宙航空研究開発機構宇宙科学研究所)、コンビーナ:鹿山 雅裕(東京大学大学院総合文化研究科広域科学専攻広域システム科学系)、長岡 央(理化学研究所)、コンビーナ:仲内 悠祐(宇宙航空研究開発機構)、座長:仲内 悠祐(宇宙航空研究開発機構)、西野 真木(宇宙航空研究開発機構宇宙科学研究所)

16:45 〜 17:00

[PPS06-18] The Optical Performances of Multi-Band Camera (Flight Model) onboard SLIM

*仲内 悠祐1佐伯 和人2大竹 真紀子3長岡 央4本田 親寿3西谷 隆介3荒木 亮太郎2加藤 礼也2、佐藤 広幸1石原 吉明1、坂井 真一郎1 (1.宇宙航空研究開発機構、2.大阪大学、3.会津大学、4.理化学研究所)

キーワード:月、SLIM、分光観測

Smart Lander for Investigating Moon (SLIM) project aims to demonstrate a “pin-point” landing within a radius of 100 m on the lunar surface. It is planned to launch in FY2022.
SLIM is equipped with one science camera: Multi-Band Camera (MBC). Using MBC, we measure multiband spectra of rocks and soils around the landing site, SHIOLI crater, and determine the mineral composition, especially Mg# (= molar Mg / (Mg + Fe)). The MBC is composed of a Vis-InGaAs imaging sensor, a filter-wheel with 10 band-pass filters, a movable mirror for panning and tilting, and an autofocus system.

To examine the optical performance of the Flight Model of MBC (MBC-FM), the barium sulphate integrating sphere and monochromator at Tsukuba Space Center were used. In the exams using the integrating sphere, a flat light source was introduced from the integrating sphere to the field of view of the MBC, and the sensitivity and linearity data of all pixels against the input light intensity, exposure time, and detector temperature were obtained. The presence of stray light was also investigated. The transmittance spectra of the band-pass filters were measured using a monochromator, CT-25CDZ (Bunkoukeiki Co., Ltd.).

The linearities of all pixels for input light intensity, exposure time, and detector temperature was R2 ≧ 0.99, which is expected to obtain a calibration equation with 0.1 % accuracy. The stray light from outside the field of view was less than 1 %. And the transmittance of all bands was more than 80 %. Based on our results, in the case of observing dark mantle deposits (worst case), it is calculated that the signal-to-noise ratio of all bands is greater than 75 in one shot, and the signal-to-noise ratio of all bands is greater than 100 when integrated.