[ ESO ]  

FORS Exposure Time Calculator

Optical Spectroscopy Mode Version 5.0.0
The page is loading... please wait!

Input Flux Distribution

 Uniform (constant with wavelength)
 Blackbody: T =		 Kelvin
 Template Spectra:	  Redshift Z = 

Object Magnitude (Vega System):    Band:
Magnitudes are given per square arcsec for extended sources. Note that some template spectra are 
defined over a limited wavelength range and may not allow calculations for all instrument configurations.
The object magnitude is not taken into account for the following single line source. Single line Wavelength: nm Flux: 10E-16 ergs/s/cm2 (per arcsec2 for extended sources) FWHM: nm (Minimum value: 0.50) Spatial Distribution: Point Source Extended Source

Sky Conditions

Days From New Moon: Airmass: Seeing: arcsec The sky brightness is determined by the moon phase according to this table

Instrumental Setup

Mirrors (2 aluminium coated mirrors): 80.00 % at 670 nm

Resolution:   Standard

Detector:     MIT Red -optimized CCD
              E2V Blue-optimized CCD

             Readout mode: 


Slit:          arcsec

Polarimetry:  No Polarimetry
              Linear or Circular Polarisation


 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 2D simulated image

[Observing Facilities and Operations] [ESO] [Index] [Help]