[P-CG18] 宇宙・惑星探査の将来計画および関連する機器開発の展望

[PCG18-10] The Hydrogen Lyman-alpha imager for Comet Interceptor mission

*吉岡 和夫¹、村上 豪²、桑原 正輝³、鈴木 雄大⁴、亀田 真吾³、田口 真³、川原 琢也⁵、吉川 一朗¹、新中 善晴⁶、河北 秀世⁶ (1.東京大学大学院新領域創成科学研究科、2.宇宙航空研究開発機構宇宙科学研究所、3.立教大学理学部、4.東京大学大学院理学系研究科、5.信州大学工学部、6.京都産業大学)

キーワード：ライマンアルファ、彗星、コマ

The comet coma can be observed remotely through the Lyman-alpha. Although the size of a typical comet nucleus is only about 10 km, the hydrogen gas coma is known to extend over 10 million km. Those hydrogen are originally ejected from the nucleus by sunlight or tidal heating, and then dissociated into hydrogen atoms by UV light. Therefore, it is important to know the spatial distribution of these secondary products of water to understand the dynamics of the comet. The Hydrogen Imager (HI) is now under development to be boarded on the B1 spacecraft of Comet Interceptor mission led by ESA and JAXA. The instrument consists of 6cm-class Cassegrain telescope, various filters, and photon detector. In this study, the development status of HI and observation scenario with feasibility study will be shown.