日本地球惑星科学連合2018年大会

講演情報

[EE] Eveningポスター発表

セッション記号 P (宇宙惑星科学) » P-PS 惑星科学

[P-PS02] Regolith Science

2018年5月22日(火) 17:15 〜 18:30 ポスター会場 (幕張メッセ国際展示場 7ホール)

コンビーナ:和田 浩二(千葉工業大学惑星探査研究センター)、中村 昭子(神戸大学大学院理学研究科地球惑星科学専攻)、Patrick Michel(共同)、Kevin John Walsh (Southwest Research Institute Boulder)

[PPS02-P06] Apparent temperature profile of rough surface observed by TIR on board Hayabusa2

*千秋 博紀1坂谷 尚哉2横田 康弘3,4諸田 智克5 (1.千葉工業大学惑星探査研究センター、2.明治大学理工学部、3.高知大学理学部、4.宇宙科学研究所、5.名古屋大学大学院環境学研究科)

キーワード:はやぶさ2、ラフネス、TIR、表面温度分布、数値計算

TIR is the thermal infrared imager onboard Hayabusa2, a Japanese asteroid exploration mission. It takes the 2D image of the brightness temperature distribution on the target asteroid Ryugu. Hayabusa2 will stay at so-called "home-position" which is on the line between Ryugu and Earth and 20 km above Ryugu, resulting almost constant solar phase angle in a short time scale. The observation of apparent temperature at a constant phase angle might mislead the thermos-physical parameter such as thermal inertia because it is known that the apparent temperature of a rough surface depends on the observation angle.

To evaluate the effect of the surface roughness on the apparent temperature, we conducted a numerical model on the rotational thermal evolution of a roughness, and TIR images are simulated by using the result of the numerical model. In the real operation of Hayabysa2 mission beginning in this summer, we will be able to evaluate the surface roughness by comparison of the real TIR image and the simulated TIR images for various roughness parameters.