Malls Exposure Time Calculator

These calculation are based on the following conditions.

==Star spectral type B1==

seeing size = 1.5 arcsec
slit width = 1.0 sec
slit filter = Clear
recommended order cut filter "GG475" --See this page

Calculate S/N ratio

Grating
Wevelength
V mag
Expsure time sec





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Calculate Exposure time

Grating
Wevelength
V mag
S/N ratio





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last update : 16 July 2019