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Proceedings Paper

HII/L2 mission: future Japanese infrared astronomical mission
Author(s): Takao Nakagawa; Masahiko Hayashi; Mitsunobu Kawada; Hideo Matsuhara; Toshio Matsumoto; Hiroshi Murakami; Haruyuki Okuda; Takashi Onaka; Hiroshi Shibai; Munetaka Ueno
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Paper Abstract

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.

Paper Details

Date Published: 28 August 1998
PDF: 9 pages
Proc. SPIE 3356, Space Telescopes and Instruments V, (28 August 1998); doi: 10.1117/12.324469
Show Author Affiliations
Takao Nakagawa, Institute of Space and Astronautical Science (Japan)
Masahiko Hayashi, National Astronomical Observatory of Japan (United States)
Mitsunobu Kawada, Institute of Space and Astronautical Science (Japan)
Hideo Matsuhara, Nagoya Univ. (Japan)
Toshio Matsumoto, Institute of Space and Astronautical Science (Japan)
Hiroshi Murakami, Institute of Space and Astronautical Science (Japan)
Haruyuki Okuda, Institute of Space and Astronautical Science (Japan)
Takashi Onaka, Univ. of Tokyo (Japan)
Hiroshi Shibai, Nagoya Univ. (Japan)
Munetaka Ueno, Univ. of Tokyo (Japan)

Published in SPIE Proceedings Vol. 3356:
Space Telescopes and Instruments V
Pierre Y. Bely; James B. Breckinridge, Editor(s)

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