Malls Exposure Time Calculator

These calculations are based on the following conditions.

==Star spectral data==
HD 161817
star spectral type A2V

==observation conditions==
seeing size: 1.5 arcsec
slit width = 0.8 sec
slit filter = Clear
recommended order cut filter --See this page
Calculate S/N ratio

Grating
Center Wevelength
AB mag
Exposure time sec





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last update : 21 July 2024