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GIRAFFE Exposure Time Calculator

Optical Multi-Object Spectroscopy Mode Version 6.0.0
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Source Model

Input Flux Distribution:
Uniform (constant with wavelength) Target Magnitude and System:
=  Vega
Magnitudes are given per arcsec2
for extended sources.
Template Spectrum:
Redshift z =
Blackbody: Temperature : K
Source Geometry: Point Source  
Extended Source The magnitude (or flux) is given per arcsec2 for extended sources

Sky Conditions

Moon phase: days from new Moon
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 and telescope. See the helpfile for details.

Instrument Setup

Fiber Mode (Sky Sampling):

MEDUSA mode only: Object-fiber displacement: arcsec (range: [ 0.00 ; 0.60 ]).
In other modes, this value is irrelevant and has no effect.

High resolution: Setup (λc):
Low resolution: Setup (λc):
Detector: Carreras CCD mode:


 S/N:			Value    Plotting range  %
 Exposure Time (s):	Value    Plotting range  %

Plots: Toggle All / No Plots Object Spectrum Sky Spectrum Input spectrum in physical units Signal-to-noise Total Efficiency and Wavelength Range Details of Image Quality Calculations (only for pointsources)

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