Hyper Suprime-Cam (HSC) is a gigantic digital still camera for 8.2 m Subaru telescope which is being built by National Astronomical Observatory of Japan in collaboration with international academic and industrial partners. Because the telescope is large, its camera is also large; the height is taller than human being and its weights about three tons.
The camera consists of lens, filters, shutter and light sensors. The sensor is newly developed highly sensitive CCD and the pixel number is 870 Mega pixels in total that cover 1.5 deg FOV in diameter. These CCDs are installed inside a vacuum cryogenic dewar and are operated at -100 C where the dark current becomes negligible. The diameter of the first lens is 82 cm and the length of the lens barrel is 165 cm. Mechanical alignment of optics (e.g. focus adjustment) is realized by the precision hexapod system that consists of six customized actuators.
The system is being assembled now and will see the first light in early 2012. Hyper Surime-Cam Project is supported by Grants-In-Aid (JSPS, MEXT), ASIAA, Princeton, IPMU and NAOJ.