ANDES Exposure Time Calculator

Computing S/N ratio for extended source

version 1.1

 

Program description

 

Main Input Parameters

λ (μm) [0.35-2.5]
Exposure Time (sec)
NDIT (number of separate read outs to reach the exposure time)
Surface Brightness (AB mag/arcsec2)
R
Diameter of spectrograph aperture (arcsec on sky) (use -1 for default values)
 

Other Input Parameters

Instrument Efficiency
Telescope Efficiency (use -1 for values released by ESO)
Airmass
Sky Background (AB mag/arcsec2) (use -1 for default values)
Telescope and optics temperature (K)
Telescope and optics emissivity
Telescope Diamater (m)
Central obscuration fractional diameter
Pixel size (μm)
Focal aperture of camera
On-chip binning (total number of pixels, only for λ <0.95 μ m)
Detector Read Out Noise (e-/px)
Detector Dark Current [e-/px/hr]