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Hyper Suprime-Cam (HSC)

  Light emission issue in CCD 044 (1_10)

CCD 044 (1_10) had began emitting light from one of its corners since the night of October 6th, 2026 HST (see the report for details). This CCD has been temporarily disabled to prevent stray light generation (see the CCD arrangement diagram). Further investigation will be conducted prior to the first HSC observing run of S27A.

  Read-out anomaly in CCD 021 (1_34)

CCD 021 (1_34) has suffered read-out failure over the entire surface since April 25th, 2025 HST (see the report for details). It has been decided to keep this CCD disabled from the beginning of HSC S25A July run to prevent occurrence of noises on the neighbor CCDs. See also the CCD arrangement diagram.

  Queue Completion Report

QReport website has been newly established to provide Queue Completion Report information to PIs of HSC/PFS queue-mode programs. For inquiries regarding the user login credentials, please contact HSC Queue Working Group (hsc-queue_at_naoj.org).

News

Introduction

The Hyper Suprime-Cam (HSC) is a gigantic mosaic CCD camera, which is attached at the prime focus of Subaru Telescope. The HSC uses 104 main science CCDs which cover 1.5-deg field-of-view in diameter with a pixel scale of 0.17 arcseconds, as well as 4 CCDs for auto guider and 8 CCDs for focus monitoring.

It takes about 30 min for changing filters (including a focus check). Before starting a filter exchange, it is necessary to move the telescope to the zenith and rotate the instrument rotator to the appropriate angle. We also have to close the cover of the primary mirror for safety operation.

When you consider developing a new HSC filter, please be sure to read the filter policy carefully and contact the Subaru Telescope (contact person: T. Terai terai_at_naoj.org) well before applying for funds. Also, please refer to the procedure to determine filters for each HSC run.

We ask for your understanding in advance that the obtained data of which proprietary period (18 months) has not yet expired may be used by Subaru staff without PI's permission for engineering purposes.

Instrument

Observation

Data Analysis and Archive

Tools

Image Quality

Investigation Reports

Problem Reports

Contact

Questions regarding HSC should be directed to Satoshi Miyazaki (satoshi_at_naoj.org) and Tsuyoshi Terai (terai_at_naoj.org).

Please note that all numbers on these pages are subject to change as the performance of HSC is better determined.

Last Update:  October 28, 2026 HST