Abstract
Hyper Suprime-Cam (HSC) is a wide-field imaging camera on the prime focus of
the 8.2m Subaru telescope on the summit of Maunakea. A team of scientists from
Japan, Taiwan and Princeton University is using HSC to carry out a 300-night
multi-band imaging survey of the high-latitude sky. The survey includes three
layers: the Wide layer will cover 1400 deg$^2$ in five broad bands ($grizy$),
with a $5\,\sigma$ point-source depth of $r 26$. The Deep layer covers
a total of 26~deg$^2$ in four fields, going roughly a magnitude fainter, while
the UltraDeep layer goes almost a magnitude fainter still in two pointings of
HSC (a total of 3.5 deg$^2$). Here we describe the instrument, the science
goals of the survey, and the survey strategy and data processing. This paper
serves as an introduction to a special issue of the Publications of the
Astronomical Society of Japan, which includes a large number of technical and
scientific papers describing results from the early phases of this survey.
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