Q: How can I change the parameters of individual slits such as width, slit length or orientation angle? This isĮspecially important in regions where there are few guide stars. Occur in the catalog more frequently than one would guess. Is always a good idea to use this feature, since non-stellar objects With North up, and your sky window may be oriented differently. Web browser, or if you prefer the ImageMagick "display" command if you Resulting GIF image or possible HTML error message.
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This command should accept a full URL as its argument and display the MYDISPLAY environment variable to select an alternate command, and Linux the "firefox" browser is used by default. For Mac-OS-X this uses the "open" command, and for Send a rquest for a 1.5 arc minute square picture centered on the Holding the control key and right clicking on a star will Instruction file (mginstr.txt) under the "Guide Star selection" There is a feature in the sky window to obtain an on-line sky survey Q: How can I tell if the guide stars I select in the sky window are actually stars rather than galaxies or other non-stellar objects? Of guide stars will still be required for a final design however. Will not generate a final slit mask definition file. Task to bypass the catalog star exit, since the quick look option The quick look option activated by the "MaskGen" button in the intgui Laptop systems without catalog data, it would be possible to allow If there is a demand by observers wishing to try mask designs on
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To guide the telescope in field rotation, and to allow the telescopeĬontrol system to update the mirror figure for optimal images. Which two guide stars have not been specified. To prevent this, the maskgen task will not process a mask design for Something you don't want to have happen when you get to the telescope. Some observers haveįound that it is possible to design a mask for a location and positionĪngle at which no suitably bright guide star is available. In the slits and the telescope figure corrected. Longer observations really need the guiders to keep your objects It is quite difficult to observe without them, and The IMACS instrument requires that guide stars be specified forīoth guiders.
Q: Why am I required to select guide stars? Can I get around this if I am designing masks on a system without the catalog files? Use the "MustHave"įeature only when you actually want the object to appear on the mask Is produced by maskgen for each such conflict. Such objectsĪre never removed for conflicts, only for spectra not being on theĭetector or the slit falling off the allowed cutting area of the (numerically less than) the "MustHave" priority value. You probably had some objects for which the priority was over With the selection of the high priority targets. Then be selected to maximize the number of them, and yet not interfere This will ensure that all the high priority targets are on the mask, andĬonflicts between them are decided by priority. Set the priorities from highest (numerically least) to lowest as: Q: I have some high priority targets which I definitely want, and some filler targets which I would like to add as many as possible, but not bump any of the high priority targets. Spectra may be seen which meet that test, but their total conflictable Specify a more restrictive wavelength range for the detector bound test, Also, if you use the detector range feature to
Its spectrum is computed to find conflicts with program object spectra,īut the spectrum of an alignment star is allowed to fall off the detector,Īnd you will see those. Hole image falls on the detector in direct mode, it is allowed. Is no such requirement for alignment stars.
While spectra of program objects whichĮxceed the detector bounds cause those objects to be removed, there The plot shows the expected spectra in the detector space forĪll the features on the mask.
Q: On the debug plot for "maskgen" some spectra fall off the detector boundary shown on the plot. If extra orders is used, slit images willĬonflict with themselves if the ratio of low to high wavelength endsĮxceeds the ratio of adjacent spectral orders, which removes all objects. Have the objects appearing, change your wavelength range and slit sizes Your slit dimensions, or use the default slit sizes to start. Option, and you should see some objects selected. Use a greatly reduced wavelength range, and turn off the extra orders Is that you have too large a wavelength range, or too high dispersion. Objects to see that they are in the field) then the next probable thing The field center (look at the sky window, and enable plotting of the If you have checked for the obvious things such as an error in entering Q: I don't get any objects for my mask, they all seem to be removed for conflicts.
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IMACS (and LDSS) mask generation software support. Here are some of the things which are most frequently asked for
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