28 August 1998 HII/L2 mission: future Japanese infrared astronomical mission
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We present a conceptual design of a future Japanese IR astronomical satellite: the HIII/L2 mission. We propose a 'warm launch' cooled telescope; the telescope is to be launched at ambient temperature and is to be cooled in orbit to 4.5K by a modest cryogenic cooler with the help of radiative cooling. Since liquid helium and hence a heavy vacuum vessel are not longer required, the warm launch design reduces the weight of the satellite dramatically. We propose to launch this satellite into a halo orbit around S- E L2, one of the Sun-Earth Lagrangian liberation points. The S-E L2 is an ideal orbit for IR astronomy, since (1) radiative cooling can become very effective, and (2) by the Japanese H-IIA launching vehicle. This mission focuses on high-resolution mid- to far-IR observations with unprecedented sensitivity, since the large aperture reduces confusion noise and the cooled optics suppresses instrumental background radiation. The HII/L2 mission is an ideal observatory-type platform to make follow-up observations to the ASTRO-F/IRIS survey mission. The target launch year is 2010.
© (1998) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Takao Nakagawa, Masahiko Hayashi, Mitsunobu Kawada, Hideo Matsuhara, Toshio Matsumoto, Hiroshi Murakami, Haruyuki Okuda, Takashi Onaka, Hiroshi Shibai, Munetaka Ueno, "HII/L2 mission: future Japanese infrared astronomical mission", Proc. SPIE 3356, Space Telescopes and Instruments V, (28 August 1998); doi: 10.1117/12.324469; https://doi.org/10.1117/12.324469

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