Hyper Suprime-Cam (HSC)

Information for S21A applicants

  Schedule of HSC runs in S21A
  • There will be at least three (3) times (February, March, and June) of HSC observing runs.
  • No HSC run in April due to renovation of the telescope facility.
  • The schedule for May and July is not yet fixed.

  Changes in the queue-mode policy
There are some important changes in the policy of queue-mode observations. Please be sure to see HSC Queue Mode page if you plan to apply for the queue mode.

  Default observation mode
Queue mode is the default observing mode for the Normal, Intensive, and Filler programs. Applicants wishing a classical mode observation with HSC have to describe why the classical mode is preferred to the queue mode in "Scheduling Requirements" section of the application form. Without any convincing reason, the observation mode may be changed from classical to queue. Note that a proposal requesting the NB387 filter must be submitted as a classical mode program.

  Filter set
HSC applicants must explicitly describe the filters they intend to use in the "Instrument Requirements" section of the application form, where the desired set as well as the minimum acceptable set should be clearly specified. If you would like to use the NB430 or NB497 filter, you must obtain an approval from filter developer team in advance of the proposal submission.

  Observations for HSC-SSP fields
HSC applicants requesting to observe the same fields as targeted in the HSC-SSP (Subaru Strategic Program) are obliged to clarify the reason for doing so (e.g., how the scientific aim is different from that of SSP).

  "No-Additional-Target" policy
Requesting additional targets for filling dead time (a.k.a. "Sukima time"), when there is no planned target on the night sky, is not allowed for any HSC observations. "Sukima time" will be exploited as effective as possible depending on the situation (observing priority: (1) observations of standard stars, (2) queue-mode observations for Grade A/B programs, (3) observing applicant's back-up targets, and (4) queue-mode observations for Grade C and F [Filler] programs).

  No service programs
Service observations are not available for HSC.

Last update: July 20, 2020

Advice for observers of HSC S19A/S19B programs:

  It was confirmed that HSC images had suffered from two kinds of problems since late February 2019.
  Please be sure to read the following announcements for reduction of HSC data obtained in the corresponding periods.
  1.   Shadow due to a lens stain   ( 2019/2/27–10/4 UT )

  2.   Arc-shaped ghost due to stray light from the dome inside   ( 2019/2/27–11/6 UT )

Last update: November 15, 2019



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 covers 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). When we exchange filters, it is necessary for us to move telescope to the zenith position, and rotate the instrument rotator to the appropriate angle. we also close the cover of the primary mirror for safety operation.

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

We ask for your understanding in advance that observed data, whose proprietary periods (1.5 yrs) do not end, may be used by Subaru staff without PI's permission for engineering purposes.



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