Nordic Optical Telescope
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FIES exposure-meter count calculator
Stellar input
Spectral type
     
Orion nebula
FIES setup
Fiber CCD gain [e-/ADU] CCD bin mode
                 
Signal to Noise
Required S/N
   
Needed peak counts on FIES CCD: 17600 ADU

Needed exposure-meter counts: 5950000   ( 5.95 million )

  • The S/N is that in the reduced spectrum per (binned) wavelength bin.

  • The CCD linearity limit is 1100000 ADU.

    John Telting
    jht not.iac.es