How to prepare an OPE file for Hyper Suprime-Cam |
Parameter_listsection
Commandsection
Observations of Subaru Telescope are conducted by executing script files called 'OPE file (Observation Procedure Execute file; but often called OPEration file)'. Observers are requested to prepare the OPE file describing the sequence of your observing tasks prior to your run. An OPE file consists of information on your targets and individual operating commands such as target acquisition, exposing, focusing, filter change, etc. Please prepare for your OPE files and send them to the Support Astronomer (SA) by e-mail. On the observing night, SA and telescope operator will load your OPE file onto the observation control system and perform the observation by following your requests.
Each individual command will be executed by SA and telescope operator on a line-by-line basis. Since operators can choose any command line to execute in your OPE file and you may also edit and modify the OPE file at the summit, command lines do not have to be sorted exactly in the order of your observation plan. However, if you write down command lines in a sorted order with reasonable comment, it would be helpful for SA to understand your intent correctly and to prevent misoperation.
You may include all the targets in one OPE file. However, it would be a good idea to separate your
OPE file into reasonably small files especially by each night in the case you awarded two or more
nights and have a lot of targets with multiple filters/modes to observe.
Template OPE file
The template OPE file can be downloaded from here.
Please follow this template file and the description below to prepare your OPE file.
An OPE file is composed of three parts. All parts should be included in the OPE file.
Detailed information of parameters with "*" are described in the description below.
Note:
Filter | "EXPTIME" |
HSC-g | 21 |
HSC-r2 | 8 |
HSC-i2 | 6 |
HSC-z | 11 |
HSC-Y | 13 |
NB0718 | 73 |
NB0816 | 67 |
NB0921 | 58 |
Detailed information of parameters with "*" are described in the description below.
Note:
Typical combinations of appropriate dome lamp settings and exposure times are as follows. These configurations are
set to obtain flat frames with the peak count of 18000 ADU.
Filter | "VOLT" | "AMP" | "EXPTIME" | "LAMP" |
NB0387 | 100.0 V | 5.10 A | 12 sec | 600 W |
NB0391 | 60.0 V | 5.10 A | 16 sec | 600 W |
NB0395 | 60.0 V | 5.10 A | 36 sec | 600 W |
NB0400 | 100.0 V | 5.10 A | 11 sec | 600 W |
NB0430 | 100.0 V | 5.10 A | 15 sec | 600 W |
NB0468 | 60.0 V | 5.10 A | 23 sec | 600 W |
NB0497 | 60.0 V | 5.10 A | 17 sec | 600 W |
NB0506 | 60.0 V | 5.10 A | 8 sec | 600 W |
NB0515 | 60.0 V | 5.10 A | 9 sec | 600 W |
NB0527 | 60.0 V | 5.10 A | 10 sec | 600 W |
NB0656 | 6.0 V | 6.33 A | 26 sec | 10 W |
EB-gri | 3.0 V | 4.34 A | 22 sec | 10 W |
Note:
In general, popular standard stars (such as Landolt's stars or typical spectrophotometric stars) are generally too bright for on-focus imaging with HSC to obtain reasonable photon counts in the linearity range even with a shortest exposure time. Therefore, defocusing is usually needed for standard star observations. Typically, reasonable defocusing on the order of 0.2–0.4 mm is needed for exposing 12–13 mag stars for "EXPTIME"=5–10s using broad band filters. Any stars brighter than 11 mag would be unavailable.
Note:
Filter | "GOODMAG" | "AG_EXP" |
HSC-g | 13.5 | 0.2 |
HSC-r2 | 14.5 | 0.2 |
HSC-i2 | 14.0 | 0.2 |
HSC-z | 13.0 | 0.3 |
HSC-Y | 14.0 | 0.3 |
NB0387 | 11.5 | 10.0 |
NB0515 | 12.5 | 0.5 |
NB0816 | 12.5 | 0.5 |
NB0921 | 12.5 | 0.5 |
NB0973 | 12.5 | 0.5 |
Detailed information of parameters with "*" are described in the description below.
Note:
Example:
Example:
Detailed information of parameters with "*" are described in the description below.
Parameters for "with auto-guiding" mode (see description "Auto-guiding" in section 4.2.1.)
Note:
Note:
SetupField $DEF_IMAGE $NEO1 OFFSET_RA=0 OFFSET_DEC=0 FILTER="HSC-r2" INSROT_PA=0 FOCUSOBE $DEF_IMAGE RA=!STATS.RA DEC=!STATS.DEC OBJECT="FOCUS TEST" EXPTIME=10
HSC-g, HSC-r2, HSC-i2, HSC-z, HSC-Y, NB0387, NB0391, NB0395, NB0400, NB0430, NB0468, NB0497, NB0506, NB0515, NB0527, NB0656, NB0718, NB0816, NB0872, NB0921, NB0926, NB0973, NB1010, IB0945, EB-gri
When we proceed your HSC observation, we would like to ask you some requirements and recommendations listed below, which may take some observation time from you.
*As the Pan-STARRS1 catalog is available in HSC pipeline from 2017/2, calibration frame does not have to be obtained with the SDSS fields.
The following expressions are not allowed or should be avoided in OPE file.
In the azimuthal direction, dome rotation takes 3 min per 90 deg (0.5 deg/s).
approx. 35s including wiping, readout, etc.
60s for changing the PA by 90 deg. Turning the instrument rotator can be done at the same time with CCD readout.
Auto-guiding works from 30s after the exposure starts, and ends 10s before the exposure finishes. Therefore auto-guiding is effective for long exposures (> 60s).
It is recommended to use auto-guiding for exposure longer than 240s.
approx. 30 min (incl. focus check).
To check the field-of-view with Aladin, please see HSC FoV Check with Aladin.