Important Notices

  1. The program completion rate againsts the seeing/moon-phase constraint of S19A-S20B programs is shown in the Completion Rate section.
  2. From S21A, requested telescope time for HSC queue-mode observation should be a multiple of 1 hour including overheads (see following notice), which is equivalent to 0.1 night based on the observatory's policy to assume 10 hours per night.
  3. From S21A, applicants for HSC queue-mode observation must include various overheads to the requested time. Total requested time for observing plan should be calculated using the HSC overhead and required time calculator or in accordance with this page.
  4. From S21A, Filler programs are executed only under poor conditions or under the situation that there is no suitable programs with higher grades. Up to 50 hours can be requested by a filler proposal. Please refer to the filler page.
  5. From S19B, seeing and transparency conditions have to be chosen from specific values. Seeing must be one of 0.8, 1.0, 1.3, 1.6, and 100, and transparency must be one of 0.7, 0.4, 0.1, and 0. In addition, tolerance factors will not be applied anymore, but the numbers will be evaluated after rounding to the first decimal place. From S21A, airmass constraint is removed and will not be used as a quality assessment metric.
  6. From S19B, a proposal using narrow-band filters with their central wavelength shorter than 400 nm should only be submitted to classical mode, and will not be accepted in queue mode. Currently, this applies to filters NB387, NB391, and NB395.
  7. From S19B we are limiting the number of the short exposures (60 sec or less) to 5 within an OB (the minimum Observation Unit). The length on-source exposure time of an OB must be equal to or shorter than 30 minutes.
  8. From S19B, in case of proposals using both broad-band and narrow-band filters, once it becomes impossible to execute a narrow-band OB due to filter scheduling, the priority of the corresponding broad-band OBs will be lowered.
  9. Time critical observation is offered to Normal, Intensive and Filler programs.
  10. No cadence program is offered.
  11. HSC queue mode programs will be executed in queue observation nights and in dead time ('Sukima time') in HSC classical mode programs. For this purpose, no additional target requests in HSC classical observations are allowed.
  12. From S19A, the standard star acquisition policy for narrow-band observations has been updated.
  13. From S19A, the policy for Filler program has been changed.
  14. From S18B, monitoring proposals are accepted. Please check the Phase 1 section and the PI document carefully.


What is the HSC queue mode?

The queue mode is a non-visitor mode observation, i.e. the observations are carried out by observatory staffs without a direct involvement of investigators (PI or Co-Is). The observations will be performed based on the rank of the observation program, the priority of the target, observing conditions (seeing, transparency, moon phase, moon distance, airmass of target), telescope slewing time, and current instrument configuration (filter etc.). This enables the appropriate selection of science objects with proper observing conditions, and allows to increase the effectiveness of the observations and data quality for better scientific outcomes.

Program selection and preparation consist of two parts, namely, Phase 1 and Phase 2. Phase 1 is the submission of proposals. The PIs should describe the observing condition constraints such as acceptable range of seeing, transparency, moon phase etc. in their proposal. Phase 2 begins after the proposal's acceptance by TAC (Time Allocation Committee). The PIs will be notified and asked to prepare and submit details of their observation plan (as a list of observing blocks) before the beginning of the observation semester.

Subaru Telescope will manage the scheduling and execution of queue-mode programs. The obtained data will be delivered to PIs after conducting quality assessment.

Below, we summarize each step of the queue-mode observation and provide useful references. For datails, please see the HSC Queue-Mode PI's Document (PDF, HTML).

Summary of Procedure

Process          What should be done by PI What should be done by the observatory
Phase 1
(CfP period)
Aug.-Sep. (A semesters)
Feb.-Mar. (B semesters)
Proposal submission.
The PI should submit a proposal via ProMS (Proposal Management System) in the same way as for classical programs. The observing condition constraints such as seeing, transparency etc. should be specified in the proposal.
  1. Announce Call for Proposal.
  2. Receive proposals via ProMS.
Phase 2
(After TAC)
Nov.-Dec. (A semesters)
May-June (B semesters)
Observing block (OB) submission.
OB is the smallest unit of observations in queue mode. Using tools Subaru Telescope provides, the PI should complete the OBs before the deadline.
  1. Request the preparation of the OB list to PIs of the accepted programs.
  2. Assist PIs to complete OBs. Check submitted OBs and give feedback.
  3. Check the probability of the observation completion for the semester. Support astronomer (SA) may ask the PI to relax the observing condition constraints to increase the probability of obtaining data.
Observation Observations will be executed by observatory staff. After the data acquisition, the PI will be notified which OBs have been observed.
  1. Scheduling and execution of queue mode will be done by Subaru Telescope.
  2. SA will make an Initial Quality Assessment (IQA) during the observation.
  3. During the day-time, Final Quality Assessment (FQA) will be performed in order to decide whether the OB is completed or should be returned to the queue.
  4. Subaru Telescope will inform the PIs about the progress of their programs.
Data Delivery When the data are ready for download, the PI will be notified with instructions on how to obtain the data. Subaru Telescope will provide the raw science data as well as associated calibration data and observation logs.



Please contact to, if you have any questions, comments, and suggetions regarding the HSC queue-mode proposal.