[P-CG20] Future missions and instrumentation for space and planetary science

[PCG20-P03] Life-environmentology, Astronomy, and PlanetarY Ultraviolet Telescope Assembly (LAPYUTA) mission: instrument overview and technical developments

*Go Murakami¹, Fuminori Tsuchiya², Masato Kagitani², Atsushi Yamazaki¹, Kazuo Yoshioka³, Tomoki Kimura⁴, Masaki Kuwabara⁵, Shingo Kameda⁵ (1.Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, 2.Planetary Plasma and Atmospheric Research Center, Graduate School of Science, Tohoku University, 3.Graduate School of Frontier Science, The University of Tokyo, 4.Tokyo University of Science, 5.Rikkyo University)

Keywords:LAPYUTA, Ultraviolet, Exosphere

The Life-environmentology, Astronomy, and PlanetarY Ultraviolet Telescope Assembly (LAPYUTA) mission aims to carry out spectroscopy with a large effective area (>300 cm2) and a high spatial resolution (0.1 arc-sec) and imaging in far ultraviolet spectral range (110-190 nm) from a space telescope. The main part of the science payload is a Cassegrain-type telescope with a 60 cm-diameter primary mirror. As a current design, three main UV instruments are installed on the focal plane of the telescope: a mid-dispersion spectrograph, a high-dispersion spectrograph, and a slit imager. The mid-dispersion spectrograph contains a movable slit with different slit width, a holographic toroidal grating with 2110 lines/mm, and an MCP detector coupled with CMOS imaging sensors. Spectral resolution of 0.02 nm and field-of-view of 100 arc-sec will be achieved. The high-dispersion spectrograph consists of a slit, a toroidal mirror, an echelle gating, a cross disperser, and a detector. Highest spectral resolution of 3 pm will be achieved at the target wavelength (130.5 nm). The UV slit imager consists of imaging optics, several bandpass filters with a rotation wheel, and a same type of UV detector as the one installed in the spectrometer. In order to achieve a high spatial resolution of 0.1 arc-sec, we will install a target monitoring camera at 0^th order position inside the spectrometer and slit imager for both attitude control and image accumulation process. We also plan to install a fine guidance sensor to monitor guidance stars. In addition, new technologies such as funnel-type MCPs and CMOS-coupled readout system and highly reflective UV coating will be applied to satisfy requirements of LAPYUTA. Here we present the LAPYUTA concept design, the overview of the spacecraft and instruments, and the status of technical developments.