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KMOS Exposure Time Calculator


Legacy version P95-phase2 (December 2014)
Provided for reference only!

This is not the normal ETC version www.eso.org/observing/etc

Infrared Mode Version 5.0.2
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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
Precipitable Water Vapor PWV = mm  (Paranal median ≈ 2.5mm)
Airmass: X= (X ≥ 1)
Seeing FWHM
in V-band
Seeing(at X)= arcsec. -Use this seeing in the phase I proposal and the OB constraints.
Seeing(at Zenith)= arcsec.
The seeing is assumed to scale with the airmass X like this: Seeing(X) = Seeing(Zenith) * X3/5.
The values in the two Seeing fields are mutually updated when one of the values changes. The field "Seeing(at Zenith)" also depends dynamically on the airmass value.
To force an update of the dynamic fields, press here: . To revert the three fields to the default values, press here: .

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.

On submission the model can generate the following graphs:

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

Detailed S/N info

Legacy version P95-phase2 (December 2014)
Provided for reference only!

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