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In the four sections of this form, select the appropriate astronomical source, telescope and instrument configuration, observing conditions, and observation parameters. Click on the calculate button (calculate button) at the bottom of any section to submit the parameters from all the sections to the server or the reset button (reset button) to reset all parameters to their defaults. The results are reported in a separate web page that can be resized and printed.

See the ITC Help for general guidance on use of the Integration Time Calculators, and the (more info) links for specific help on each section of the form.

Important Notes:

  • For a discussion of the effect of slit width on sensitivity in the JHK bands see here.
  • The atmospheric transmission and extinction files used in the ITC only extend down to 0.9 um, therefore the ITC plots artificially cut off at 0.9 um, even though the instrument itself is somewhat sensitive to shorter wavelengths (but dropping off rapidly). The Sensitivity Table gives approximate sensitivities for orders 7 (0.93um), 8 (0.83um), and 9 (0.75um) for the 32 and 111 l/mm gratings and short camera only, as those orders are automatically observed in cross-dispersed mode.
  • Very high values of signal-to-noise ratio (>several hundred) are usually not realistic, as the values actually achieved depend on many factors besides those included in the ITC. See here for more information.

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