CUBES Exposure Time Calculator

(Cassegrain U-Band Efficient Spectrograph)

Reference doc

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Input Flux Distribution

Spectrum type:

Synthetic stellar spectrum
Quasar spectrum
SCI-Template spectrum
Custom spectrum

Choose spectrum: Select spectrum type

Object type:

Point source
Extended source

Target magnitude:

U (Vega)
V (Vega)

Target magnitude: (per arcsec² for extended source)
Wavelength (A): Redshift:

Sky Conditions

U/V Sky Mag. (mag/arcs2):
Seeing (5000 A):
Airmass:

Instrument Setup

Configuration:

2 Arms

Resolution:

High
Low

Efficiency case

GOAL
WORST
EXTRAP

Binning X: Binning Y:

Exposure:

Set exposure time (s)
Set SNR

Value:

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Advanced Settings

Slicer Slit Width (arcsec): Slicer Slit Height (arcsec):
Slit Width (arcsec): Slit Height (arcsec):
Number of slices:
Groove density in ch. 1 (grooves/mm): Groove density in ch. 2 (grooves/mm) :
Angle of incidence for ch. 1 (deg): Angle of incidence for ch. 2 (deg):
Collimator focal length (mm): Collimator focal number:
Camera focal length (mm): Camera focal number:
Diffraction order: Full Well Capacity (e):
Central wavelength for ch. 1 (A): Central wavelength for ch. 2 (A):
Dark current in electron pixel^-1 s^-1 (goal case):
Pixel size (microns): Readout noise (e rms) (goal case):
Number of detector pixels in the dispersion direction (X): Number of detector pixels in the spatial direction (Y):
Telescope diameter (mm): Telescope obstruction epsilon:

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...or upload a JSON file (see example) :