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AF2+WYFFOS Essential Observing Guide
Two main computers are used by the visiting astronomer when observing with AF2+WYFFOS:
The telescope control system (TCS) computers are instead ran by the Observing Support Assistant (OSA).
The commands generally used by visiting astronomers are listed below.
All Wyffos commands are run from the taurus machine. They can be executed via the WYFFOS Graphical User Interface (GUI), or typed as command lines in the WHTICS pink window (SYS> prompt). There, you can type and execute the commands listed below, or include them in Unix scripts to automatically execute sequences of commands (SYS> source script_file). A complete manual can be found here.
SYS> command_name -h
SYS> wcenwave xxxx y
SYS> wsetfocus xxxx
SYS> wslittran xxxx
SYS> wfilter A/B in/out
SYS> wchange -grating grating_name -offset
grating_offset_value -order grating_order
WYFFOS Calibration Unit Commands
SYS> wcallamp xx
SYS> wlamptime xx
Alternatively, all WYFFOS commands can be executed by means of a GUI in the taurus machine. The GUI for the visiting astronomer appears as
All AF2 commands are run from the WHTICS Observing System window in taurus. They consist of the string 'af2' followed by a space, another string specifying the action, and in some cases also a list of parameters needed by the action. By typing
the list of all AF2 commands is printed on the screen.
Copying fibre configuration files to the Observing System and check them
Before setting up a field, the corresponding configuration file (.cfg)
should be copied into the Taurus machine. In Taurus, within account whtobs,
enter subdirectory /home/whtobs/AF2, and copy there your .cfg file
from any other ING machine
SYS> af2 check name_of_file.cfg.x
SYS> af2 checkt name_of_file.cfg.x hh:mm:ss.s
Setting up a field
SYS> af2 wake
SYS> af2 setup name_of_file.cfg.x
Note that with the new AF2 software a complete setup usually takes less than 20 minutes.
SYS> af2 recover
SYS> af2 sleep
Note that the fibres configuration can be done at any telescope position, as fibres do not move on the plate when telescope is moved. So, it is safe to set in the afternoon the first configuration field used at night. However, as the xy plate coordinate system might have a general drift with large telescope movements, if the same field has to be reconfigured during the night, we suggest to run the AF2 command
SYS> af2 loadmoduleChecks and updates the positions of all the usable fibres (i.e. not dead or disabled) in the fibre module.
(this takes 2 min) before reconfiguring the field.
Other useful commands
SYS> af2 allcircle
SYS> af2 allpark
SYS> af2 park
UltraDAS commands (taurus)
The complete list of commands can be found in the UltraDAS dictionary. Some of the most important ones are listed below.
SYS> rspeed wyffos slow/fast
SYS> bin wyffos x y
SYS> bias wyffos
SYS> multbias wyffos n
SYS> run wyffos xxx "title" &
SYS> multrun wyffos nn xxx "title" &
SYS> abort wyffos
SYS> finish wyffos
SYS> newtime wyffos xxx
The same syntax as for the "run" command is used for the flat (flat fields), arc (arc lamps), sky (sky offsets), with the only difference that the corresponding FITS header is filled with the exposure type.
Observing a science field
When a field is setup for the correct Sidereal Time, just give the coordinates of its centre, equinox, and the sky Position Angle to the OSA, who will acquire the field and start guiding. Exposures are defined using the UltraDas commands in the previous section.
Acquiring a standard star
This requires knowing the offset between the gripper centre (where the fibre is) and the mobile probe sky viewing camera. To do it, you must have a field configured.
Step 1: Determine gripper centre
This step is carried out on the AF2/WYFFOS setup night by the OSA, with input from the support astronomer. From time-to-time it may need to be redone during a run by the OSA. It assumes the sequence rot centre, calibrate, aperture offset has been executed successfully by the OSA.
Move the telescope to a relatively bright star:
SYS> af2 wake
SYS> af2 viewsky 0 0
SYS> af2 offsettel SKYPA STARNAME FIDUCIALFIBRENR
SYS> af2 park
SYS> af2 viewobject FIDUCIALFIBERNR
Step 2: Acquire standard star in a science fibreThis step is carried out each time you want to observe a standard star.
Move the telescope to the standard star;
SYS> af2 offsettel SKYPA STARNAME SCIENCEFIBRENR
SYS> af2 park (or af2 sleep)
You can either bring your data home in a USB external hard drive if you have one, or by burning it to a DVD. There are detailed instructions on how to do both here.
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