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The visual STELLA echelle spectrograph (SES-VIS) is a new instrument for theSTELLA-II telescope at the Iza\~na observatory on Tenerife. Together with theoriginal SES spectrograph - which will still be used in the near IR - and a newH&K-optimized spectrograph, which is currently in the design phase, it willextend the capabilities of STELLA with the follow up of planetary candidatesfrom space missions (TESS, PLATO2). SES-VIS is optimized for precise radialvelocity determinations and long term stability. We have developed a ZEMAXbased software package to create simulated spectra, which are then extractedusing our new data reduction package developed for the PEPSI spectrograph. Thefocus in this paper has been put on calibration spectra, and the full range ofavailable calibration sources (flat field, Th-Ar, and Fabry-Perot etalon),which can be compared to actual commissioning data once they are available.Furthermore we tested for the effect of changes of the environmental parametersto the wavelength calibration precision.

Using raytracing to derive the expected performance of STELLA's SES-VIS spectrograph