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KMOS Exposure Time Calculator

Infrared Mode Version 6.0.0
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Target Input Flux Distribution

Uniform (constant with wavelength) Target Magnitude and Mag.System:   
= Vega
Blackbody: Temperature: K
Template Spectrum: Spectral Type: Redshift
z =
Upload Spectrum:
Supported formats: FITS images and two-column ASCII, with
wavelength unit
nm and a flux unit proportional to erg/cm2/s/A
Single 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
The magnitude (or flux) is given per arcsec2 for extended sources.

Sky Conditions

Moon phase: days from new Moon
PWV: mm Probability 55% for a PWV smaller or equal to the requested value
Seeing: arcsec FWHM in V-band at zenith (use this value in the proposal). The seeing is irrelevant for extended sources.
Probability 60% for a seeing smaller or equal to the requested value
For point sources, the resulting Image Quality FWHM is modeled by the ETC considering the transfer functions of the atmosphere, telescope and instrument. For details see the helpfile.

Instrument Setup

Grating: Range to plot: - nm
Reference wavelength: nm
    The numeric results will refer to the Reference wavelength.
To revert the three fields to the default values, press here: .


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

The total exposure time is the product of DIT (Detector Integration Time) by NDIT (number of DITs). This exposure time does not take into account instrument and telescope overheads.

Plots: Toggle All / No Plots

Resultant spectrum including background
Object spectrum only
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
Details of Image Quality Calculations (only for pointsources)

Detailed S/N info

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