Second data release of the Hyper Suprime-Cam Subaru Strategic Program

Abstract This paper presents the second data release of the Hyper Suprime-Cam Subaru Strategic Program, a wide-field optical imaging survey using the 8.2 m Subaru Telescope. The release includes data from 174 nights of observation through 2018 January. The Wide layer data cover about 300 deg$^2$ in all five broad-band filters ($grizy$) to the nominal survey exposure (10 min in $gr$ and 20 min in $izy$). Partially observed areas are also included in the release; about 1100 deg$^2$ is observed in at least one filter and one exposure. The median seeing in the i-band is ${0_{.}^{\prime \prime }6}$, demonstrating the superb image quality of the survey. The Deep (26 deg$^2$) and UltraDeep (4 deg$^2$) data are…

• NS
  National Science Foundation

  Awards: AST-95-09298, AST-0908442, AST-0507428, AST-0071048, AST-0507483, AST-0808133, AST-0908246, AST-0607701, AST-0806732, AST-1238877, AST-0908354, AST-0807630
• UD
  U.S. Department of Energy
• NA
  National Aeronautics and Space Administration

  Awards: NAS5-26555, NNX09AC95G, Spitzer-1356708, 08-ADP08-0019, NNX08AR22G, NNG04GC89G
• GA
  Gordon and Betty Moore Foundation
• YU
  Yale University
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  Vanderbilt University
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  New York University
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  Princeton University
• OS
  Ohio State University
• HU
  Harvard University
• UO
  University of Florida
• UO
  University of Washington
• JH
  Johns Hopkins University
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  University of Arizona
• CM
  Carnegie Mellon University
• PS
  Pennsylvania State University
• UO
  University of Virginia
• UO
  University of Maryland
• UO
  University of Hawai'i
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  University of Portsmouth
• NM
  New Mexico State University
• ST
  Space Telescope Science Institute
• UO
  University of Edinburgh
• DU
  Durham University
• MO
  Ministry of Education, Culture, Sports, Science and Technology

  Awards: 15H05893, 15H05892, 15H05887
• UO
  University of Tokyo
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  National Astronomical Observatory of Japan
• HE
  High Energy Accelerator Research Organization
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  Eötvös Loránd Tudományegyetem
• JS
  Japan Society for the Promotion of Science
• JS
  Japan Science and Technology Agency
• BN
  Brookhaven National Laboratory
• LB
  Lawrence Berkeley National Laboratory
• LA
  Los Alamos National Laboratory