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

Sky Conditions

Moon phase: days from new Moon
Seeing/Image Quality:
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.
Seeing: arcsec FWHM in V-band at zenith (use this value in the proposal)
              Probability ---% of realising the seeing ≤ 0.80 arcsec
IQ: arcsec (to be used for the OB constraint set)
              The corresponding seeing and probability will be indicated in the ETC output page
Image Quality is not a parameter in AO modes

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:



Exposure Time: s

Plots: Toggle All / No Plots

Object Spectrum
Sky Spectrum
Input spectrum in physical units
Total Efficiency and Wavelength Range