KMOS Exposure Time Calculator

Infrared Mode Version P106.3
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Target Input Flux Distribution

Template Spectrum Redshift
z =
Target Magnitude and Mag.System:   
= Vega
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
Extended Source (per pixel)
Extended Source, area Ω: arcsec2

Sky Conditions

Moon FLI: Airmass:
Time step forward/back

Target coordinates Name or ID:  
α      δ     
UT rise
Hour Angle azimuth altitude zenith distance airmass FLI moon/sun
phase angle
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

Grating: Range to plot: - nm
Reference wavelength: nm   The numeric results will refer to this wavelength.


S/N ratio: S/N = DIT = s
Exposure Time: NDIT =

The total exposure time is the product of DIT (Detector Integration Time) by NDIT (number of DITs). Instrument and telescope overheads are not taken into account.

Plots: Toggle All / No Plots

Resultant spectrum including background
Object spectrum in referece area
Background emission spectrum
Sky radiance spectrum in physical units (ph/s/m2/micron/arcsec2)
Sky transmission spectrum
S/N as a function of wavelength
Total efficiency and wavelength range
Input spectrum in physical units