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A Japanese infrared astronomy satellite, known before its launch in 2006 February as ASTRO-F; the name means ‘light’ in Japanese. Akari carries a 0.69-m telescope equipped with two main instruments: the Far-Infrared Surveyor (FIS) to make an all-sky survey in the wavelength range 50–180 μm; and the InfraRed Camera (IRC) for targeted observations in the near and medium infrared range, 1.7–25.6 μm. Akari's observations extend and improve those of the Infrared Astronomical Satellite (IRAS).

Subjects: Astronomy and Astrophysics.

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