Spectrometer sensitivity

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Can someone estimate how sensitive a spectrometer has to be in order to measure the velocity spectra of Io through a 0.7m focal lenght refractor telescope (radius 70mm) of during optimal conditions? :smile:

[SpaceTiger]

Can someone estimate how sensitive a spectrometer has to be in order to measure the velocity spectra of Io through a 0.7m focal lenght refractor telescope (radius 70mm) of during optimal conditions?

What do you mean by sensitivity? Do you mean resolution? What absorption/emission line are you planning to observe to measure the velocity?

[Link]

I was thinking of the Magnesium and Hydrogen emission bands...

By sensitivity I mean for the spectrometer to produce a spectra sufficient to compare the emission lines :smile: