Observing with TRISPEC at UKIRT
The page below describes how to observe with TRISPEC especially at UKIRT.
Please see also the other sections for independent parts on a telescope,
such as changing slits/filters/grisms and taking image. And please note
that the details given below are subject to change at any time.
Running up the Operating Software
The instrument control software run on a Sun workstation (named "demi")
at the operation room, and on a RT-Linux PC (named "trispec") on the surface
of the instrument. On demi, the array readout program and the communication
programs to the telescope and IRPOL run. And, on trispec, the motor control
program for the wheels, the internal focuses, and the wavelangth calibaration
unit (WCU) run. The observers usually operate both computers from a Windows
2000 PC (named "triview") by using X-server software. To running up the
operating software, do the following procedure.
Also, it is useful to open a web browser such as Netscape Communicator.
By connecting to the
running status page on trispec (local access only at the summit), you
can check the various status of the instrument, the telescope, and IRPOL.
Log in to triview as user trispec.
Double click on the "Tera Term Pro" icon, and log in demi as user trispec
Double click on the icon again, and log in trispec as user trispec
On demi, type "trispec_ukirt.sh". An image display and five xterm
windows will open.
On trispec, type "trispec_ukirt.sh". Two xterm windows will open.
In the MESSIA window, type "messia.sh". The array readout program
"messia" will start.
In the DEMI window, type "m Init".
After the TSS has informed you the serial line interface with the telescope
control system is ready, in the TELESCOPE window, type "tel.sh".
After the TSS has informed you the serial line interface with the IRPOL
controller is ready, in the IRPOL window, type "irpol.sh".
In the MC window, type "mc.sh". The motor control program will
In the DEMI window, type "fs all init".
In the DEMI window, type "wh all init".
In the DEMI window, type "wcu rst".
Running down the Operating Software
To running down the operating software, do the following procedure.
In the DEMI window, type "obsmode dark".
In the MESSIA, TELESCOPE, IRPOL, and MC windows, key in <Ctrl-C> individually.
Log out demi and trispec, and log out triview.
Operating the Telescope via the Instrument
The observers are able to operate the telescope from the instrument via
serial line interface. The following commands are available on demi. For
detail command description, see also the
description of the telescope serial line interface at UKIRT web site.
For convenient when you type command on console, the set_target
command usually accepts "hh:mm:ss.s" or "[+-]dd:mm:ss.s"
format strings as inputs for RA or Dec. And outputs of get_demand,
and get_tel_base commands are translate from radians to "hh:mm:ss.s"
or "[+-]dd:mm:ss.s" format. If you add '-t' option, the
inputs and outputs are not translated.
By connecting to here
(local access only at the summit), you can show the telescope current status.
The status is usually refresh every five seconds.
get_airmass - Get the airmass at current telescope
get_demand - Get the current telescope demand tracking
get_guiding - Return autoguiding status
get_image_scale - Return the image scale at the
current focal plane
get_observatory - Get observatory information
get_offsets - Get offsets from base in gnomonic
get_status - Refresh the telescope status on trispec
get_system - Get tracking coordinate system
get_target - Get the coordinates of a target object
get_tel_base - Get the virtual telescope base position
get_time - Get various sorts of time
nod - Nod telescope selected chopper beam
offset - Offset telescope from base
set_base_here - Set the virtual telescope base
position to its current position
set_guiding - Turn autoguiding on/off
set_target - Specify the coordinates of a target
toffset - Offset telescope from base whilst leaving
the crosshead fixed
xoffset - Offset crosshead from base
Operating the IRPOL via the Instrument
The observers are able to operate IRPOL from the instrument via serial
line interface. The following commands are available on demi.
By connecting to here
(local access only at the summit), you can show the IRPOL current status.
hwp_0 - Move plate to 0 degrees, also used for
hwp_22 - Move plate to 22.5 degrees
hwp_45 - Move plate to 45 degrees
hwp_67 - Move plate to 67.5 degrees
hwp_90 - Move plate to 90 degrees
hwp_135 - Move plate to 135 degrees
hwp_test - Move plate to 0, 22.5, 45, 67.5, 0,
hwp_step - Move plate to 0, then move by requested
steps (8000 steps is correspond to a 360 degrees rotation)
hwp_ang - Move plate to 0, then move by requested
retarder - Set retarder name (this is written in
Data Format and Location at UKIRT
Raw data files are currently saved to directory /tmp on our workstation
"demi" (is assigned as "trispec-sun.ukirt.jach.hawaii.edu" at JAC). Usually
the instrument operator will create directories ukirt<HSTdate>
(such as ukirt20010209) for each observing date in /tmp,
and move the files to individual directories for each objects or data types
(such as ngc7027_spec or dark) under each date directory.
At the summit, the directory /tmp on demi are usually mounted
the directory /trispec on kauwa. Therefore, the observers can find
the raw data files in directory /trispec or /trispec/ukirt<HSTdate>
on kauwa. However, since the directory /tmp on demi are no enough
to storage raw data files for every observing date, the operator will remove
them after back-up files for a few days.
The raw data files are saved as the standard FITS format.
The files are separated for each detector.
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Last Modification Date: 2001/03/16
Last Modification Author: Makoto