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Position Editor Window
| POSITION EDITOR WINDOW
COMPONENTS |
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Menu
Bar
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File Menu
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you won't need to use this unless loading an
image of your own
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View menu
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various options for controlling the display in
the image window; most useful is the "cut level" editor
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Go Menu
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for quick return to previously-displayed files
(but this does not cause the OT Program window to move to the
associated Observation - use this only for quickly having a look at a
previous field. You will notice that the image window informs you that
"base position is out of view".
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Graphics
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very little used.
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Catalog
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access to image servers and sky catalogues. The
JAC local DSS server is the quickest when located in Hawaii; otherwise
there is access to ESO, CADC and NOAO Kitt Peak servers.
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Status
Bar
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Zoom controls
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Click to expand and contract the image field of
view.
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Pixel coordinates
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Bottom left is zero,zero.
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Pixel value
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Possibly useful if using an infrared FITS file.
Otherwise ignore this.
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Sky coordinates
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Epoch indicated.
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Mode and View
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Mode
Section
Browse - when selected, you can
right click and drag to quantify offsets between two positions. Display
is in arcminutes and arcseconds.
Drag - when selected, dragging the base
position indicator
in the image window causes the target position in the OT target
component to update. The other two buttons in this section can be
ignored.
GUIDE - when selected, clicking on a star in the image
window will select a guide star. The other buttons in this section
can be ignored.
View Section
Base - causes the base position defined in the OT target
component to be displayed as a small cross within a circle.
Guide etc. - causes the guide position to be displayed.
Note that you will need to have this clicked in order to select a guide
star.
Sci Area - causes the science
area specified by the instrument component to be displayed.
Catalog - causes objects in the star
catalogue selected in the "Catalogs" menu to be displayed.
Acq Cam - causes the field of the
TSS's acquisition camera to be displayed. Not normally a useful
function
since most acquisition proceeds without using this camera.
Xhead - causes the range of motion
of the crosshead (on which the guider is mounted) to be displayed.
Dichroic - causes areas of the field
affected by the edges of the dichroic to be displayed.
Irpol - displays the
location of the IRPOL vignetting for polarimetry programmes
WFCAM AG - displays
the field of view of the WFCAM guider.
WFCAM Tile AG -
displays four guider chip images, situated where they would have to be
to generate a contiguous tile. Use this, in "drag" mode, to find an
appropriate base position which will include a guide star in each guide
chip when used in the "single tile" MSB in the WFCAM template library.
Offset - toggles
display of the positions of offset locations in your jitter pattern.
This button is only present when an offset iterator is highlighted in
the main science programme window.
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Main image
window - Cassegrain
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Image
Window Contents
[Purple] -
Crosshead limits
- These are approximate;
be conservative when choosing guide stars near the edges
of this circle. The radius of the circle is about 120 arcseconds. You
should also stay closer to the centre than the vertical and horizontal
purple lines near the edges. Programme validation will do a basic check
of your position (e.g. whether it is completly outside the circle) but
it is up to you to choose something sensible. If the TSS does not see
anything at your selected position, they will try to find an
alternative star; any time spent doing this will be charged to your
project.
[Green] - Dichroic edges -
Again approximate; stay away
from the thick green lines (these are the edges of the glass surface,
seen at 45 degrees inclination), and the thin green lines (these are
the edges of the dichroic coating on the glass).
[Green] - base position - In this
example, a hard to see circled cross, down in the centre.
[Green] - Guide star position. Click on a star to select. You need the
"GUIDE etc." button pressed to be able to see your selection (see the
table above).
[Cyan] - science field - in
this case, the 90-arcsecond CGS4 slit, oriented east-west.
[Yellow] - (i) IRPOL vignetting and (ii) science target offset
locations (see below)
Notes on guide-star brightness
limits are in the main preparation
document.
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[Blue] - offset
positions of the guide star (see plot to the left). To
display both the science target offset positions and guide star offset
positions, click on the offset iterator in your science programme.
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Main window - Wide Field
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[Blue] - chips 1 - 4 (from
bottom right, clockwise)
[Purple] - WFCAM
autoguider area
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Pan and Zoom
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Pan
and Zoom Window Contents
[Top] - Pan window - when zoomed in, moving the yellow box
causes the main window to pan around the image.
[Bottom] - Zoom window - A small subsection of the image,
centred on the cursor position. Use for finessing guide star selection.
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