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NIRI is only available for imaging due to problems with the focal plane mask and beam splitter mechanisms. The spectroscopic setups are provided in the ITC for use in archival data reduction.

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.

WARNING: A bug has been reported in the NIRI ITC when performing calculations on extended sources with uniform surface brightness and using Altair for guiding and the "optimum S/N" software aperture size. Until the problem is resolved, please manually select the software aperture size (under "Analysis method") when using extended sources with uniform surface brightness and Altair.

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