E-ELT Imaging Exposure Time Calculator
Note: These tools are provided for the technical assessment of feasibility of the observations and instrument configurations only.
See also: Frequently Asked Questions
There are two E-ELT ETCs: Imaging and Spectroscopy. Both are generic Exposure Time Calculators, which can be used to simulate different instrument setups. The interface allows to set the simulation parameters and examine interactively the model generated graphs. The ETC programs allow easy comparison of the different options relevant to an observing program and instrument development, including target information, instrument configuration, variable atmospheric conditions and observing parameters.
These programs provide an HTML/Java based interface and consist of two pages. The observation parameters page presents the entry fields and widgets for the target information, expected atmospheric conditions, instrument configuration, observation parameters such as exposure time or signal-to-noise, and output selection. An "Apply" button submits the parameters to the model executed on the ESO Web server. The results page presents the computed results, including number of counts for the object and the sky, signal-to-noise ratios, instrument efficiencies, PSF size etc..
The optional graphs are displayed within Java applets allowing interactive manipulation. The results are also provided in ASCII and GIF formats for further analysis and printing. Finally a summary of the input parameters is appended to the result page.
U = 21.88 mag/arcsec2 B = 22.43 mag/arcsec2 V = 21.62 mag/arcsec2 R = 20.95 mag/arcsec2 I = 19.71 mag/arcsec2
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