FEROS Exposure Time Calculator
Optical Echelle Spectroscopy Mode Version Version P115.0 (September 03, 2024)
Description
FAQ
 
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Target Input Flux Distribution

Template Spectrum Redshift
z = 		Target Magnitude and Mag.System:   
= Vega
AB
Magnitudes are given per arcsec2 for extended sources
MARCS Stellar Model
Upload Spectrum
Blackbody Temperature: K
Power Law Index:           F(λ) ∝ λindex
Emission Line
Lambda: nm
Flux: 10-16 ergs/s/cm2 (per arcsec2 for extended sources)
FWHM: nm


Spatial Distribution: Point Source

Sky Conditions

Moon FLI: Airmass:
Almanac
Time
Time step forward/back


Target
Target coordinates Name or ID:  
α      δ     
UT rise
culm.
set		 Hour Angle azimuth altitude zenith distance airmass FLI moon/sun
phase angle		 moon/target
separation
Target
Moon
Sun
An advanced almanac is available in the ESO SkyCalc sky model calculator
PWV:     mm     Probability % of realising the PWV ≤ 10.00 mm
Seeing/Image Quality:
Turbulence Category:   (FWHM of the atmospheric PSF outside the telescope at zenith at 500 nm)
IQ: arcsec FWHM at the airmass and reference wavelength
              The corresponding seeing and turbulence category will be indicated in the output page
Image Quality is not a parameter in AO modes

Instrument Setup

ADC enable ADC
Note: In the current model, the ADC transmission curve is included when ADC is enabled, but the only airmass dependency is the reduction of object flux due to the atmospheric extinction. The airmass dependency of the fiber aperture loss due to the differential atmospheric diffraction (which the ADC is correcting for) is currently not considered.
CCD mode:

In the binning, the second value refers to the direction of the dispersion in the spectra

Exposure Time:

Results

Include exposure times for S/N:


Tables:  Toggle All / No Tables
Spectral Format
Expected Counts
       
Graphs:  Toggle All / No Graphs
Input Spectrum
Efficiency
Obj
Sky
Maximum Intensity
S/N