8 September 2005 Formation Flight All Sky Telescope (FFAST)
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Abstract
We propose an all-sky-survey at hard X-ray region (up to 80 keV) by using a formation flight of two satellites. They consist of a telescope satellite, carrying a super mirror focusing at hard X-ray region, and a detector satellite, carrying scintillator deposited CCDs (SDCCDs) for hard X-ray region. These two satellites are in the same orbit (altitude is about 500 km) in formation flight. Since the super mirror will be a thin-foil mirror with poor imaging capability. Therefore, they control the separation of 20m±10 cm. Both satellites are in Keplerian orbit, then the viewing direction (from the detector satellite to the telescope satellite) scans along a large circle. Due to the precession of the orbit, the large circle gradually moves in the sky so that we can cover a large fraction of the sky. We can cover a large fraction of the sky without consuming a lot of fuel. However, the unseen regions are left near the ecliptic poles. This project, Formation Flight All Sky Telescope (FFAST), will be the first all sky survey at hard X-ray region.
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Hiroshi Tsunemi, Hiroshi Tsunemi, Ken'ichi Torii, Ken'ichi Torii, Emi Miyata, Emi Miyata, Masaharu Nomachi, Masaharu Nomachi, Hideyo Kunieda, Hideyo Kunieda, Yasushi Ogasaka, Yasushi Ogasaka, Masayuki Itoh, Masayuki Itoh, "Formation Flight All Sky Telescope (FFAST)", Proc. SPIE 5900, Optics for EUV, X-Ray, and Gamma-Ray Astronomy II, 59000O (8 September 2005); doi: 10.1117/12.616809; https://doi.org/10.1117/12.616809
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