[P-PS01] Outer Solar System Exploration Today, and Tomorrow

[PPS01-P01] The Ganymede Laser Altimeter (GALA) for the Jupiter Icy Moons Explorer (JUICE): development of the FM receiver modules in Japan and project status

*Keigo Enya^1,2, Masanori Kobayashi³, Jun Kimura⁴, Hiroshi Araki⁵, Noriyuki Namiki^5,2, Hirotomo Noda⁵, Shoko Oshigami¹, Ko Ishibashi³, Kazuyuki Touhara¹, Yoshifumi Saito¹, Kay Lingenauber ⁶, Reinald Kallenbach ⁶, Hauke Hussmann⁶ (1.Japan Aerospace Exploration Agency , 2.The Graduate University for Advanced Studies, SOKENDAI, 3.Chiba Institute of Technology, 4.Osaka University, 5.NAOJ, 6.DLR)

Keywords:JUICE, GALA, Ganymede, Instrument, Science, Project status

The Jupiter Icy Moons Explorer (JUICE) is a science mission led by the European Space Agency, being developed for launch in 2023. The Ganymede Laser Altimeter (GALA) is an instrument onboard JUICE, whose main scientific goals are to understand ice tectonics based on topographic data, the subsurface structure by measuring tidal response, and small-scale roughness and albedo of the surface. In addition, studying the subsurface ocean is imperative in terms of astrobiology. Investigation of the surface and subsurface environment should provide a comparative picture of the Galilean moons as a potential habitat. The development of GALA has proceeded through an international collaboration between Germany (the lead), Japan, Switzerland, and Spain. The Japanese team (GALA-J) is responsible for developing three receiver modules: the Backend Optics (BEO), the Focal Plane Assembly (FPA), and the Analog Electronics Module (AEM). Like the German team, GALA-J also developed software to simulate the performance of the entire GALA system (performance model). In July 2020, the Proto-Flight Models of BEO, FPA, and AEM were delivered from Japan to Germany. Now tests of the GALA are ongoing in Europe with the JUICE spacecraft. After the FM delivery, we are developing the Flight spare (FS) model. We present current status of JUICE/GALA and its development, mainly focusing on Japan's contribution.