[P-CG18] Future missions and instrumentation for space and planetary science

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

*Kazuo Yoshioka¹, Go Murakami², Masaki Kuwabara³, Yudai Suzuki⁴, Shingo Kameda³, Makoto Taguchi³, Takuya Kawahara⁵, Ichiro Yoshikawa¹, Shinnaka Yoshiharu⁶, Hideyo Kawakita⁶ (1.Graduate School of frontier Science, The University of Tokyo, 2.Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, 3.School of Science, Rikkyo University, 4.Graduate School of Science, The University of Tokyo, 5.Faculty of Engineering, Shinshu University, 6.Kyoto Sangyo University)

Keywords:Lyman-alpha, Comet, coma

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.