Queue mode (QM) is a type of telescope operation, where the observations are carried
out by the telescope and instrument operators, without a direct involvement of investigators
(PI or Co-I).
Targets are selected from a number of approved programs, on the basis of various criteria,
such as: the rank of the program, the priority of the target, observing conditions
(seeing, sky transparency, humidity, moon phase and distance), air mass, telescope
slewing time, current telescope configuration, etc. The main differences from the
classical mode are that the PI and Co-Is are not present during the observations
(at the summit, nor remotely), and objects from various programs can be selected for a
given night. Observations for a given program can be done any time during the whole
run allocated for the QM. Higher priority is given to higher-ranked programs, and
the observations are carried out in conditions that are required by the PIs.
The observing procedure is standardized, which ensures uniformity of all the data.
Appropriate selection of objects allows to increase the
effective time spent on target, thanks to reduced telescope slewing time and
possibility of choosing programs that do not require certain strict criteria
(for example, allow for worse seeing or sky transparency). The amount of data and
scientific outcome of QM observations is thus typically higher than of the classical mode.
The difference when compared to the Subaru Telescope Service Program observations, available for some
of the instruments1.1,
but not for HSC, is that the service programs have fixed allocation of typically 0.5n,
so their execution is dependent on many factors (like weather). Approved
QM programs are executed during few runs, lasting in total at least several nights,
thus there is more flexibility in observations and the probability of having the
best-ranked proposals completed is much higher.
The flow of queue and classical modes from CfP to Data Delivery.
The queue mode is right side blue diagrams and the classical mode is the
left gray flow diagrams. Yellow circles mark Phase 1 and Phase 2.
Queue operations are divided into several parts:
This document describes these steps in more details.
In case of unanswered questions regarding the HSC queue mode
please contact queue [at] naoj.org, or go to the QM website for more up-to-date information:
- Phase 1 preparation: proposal submission (incl. target selection, telescope
configuration, constraints setting, etc.).
- Phase 2 preparation: observing blocks submission (detailed description of
- Observations (execution of the observing blocks) and quality assessment
(check if the data meet the proposal criteria).
- Data delivery (incl. raw science data, calibrations, logs).