FORS Exposure Time Calculator

Optical Spectroscopy Mode Version 6.2.0
Description
FAQ
 
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Target Input Flux Distribution

Template Spectrum Redshift
z =
Target Magnitude and Mag.System:   
= Vega
AB
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

Sky Conditions

Moon phase: days from new Moon
Airmass:
Seeing/Image Quality:
For point sources, the resulting Image Quality FWHM is approximated by a gaussian in the ETC considering the transfer functions of the atmosphere, telescope and instrument. 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 FWHM at the airmass and wavelength of observation (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

Instrumental Setup

Resolution: Standard
High
Grism:
Slit: arcsec
Detector: MIT red-optimized CCD
E2V blue-optimized CCD

Readout mode:
Polarimetry: No Polarimetry
Linear or Circular Polarisation

Results

S/N:
Exposure Time: s

Plots: Toggle All / No Plots

Observed Object+Sky Spectrum
Observed Object Spectrum
Sky Radiance Spectrum in physical units (ph/s/m2/micron/arcsec2)
Observed Sky Spectrum
Sky Transmission spectrum
Total Efficiency and Wavelength Range
Signal-to-noise
Input spectrum in physical units
2D simulated image