EFOSC2 Exposure Time Calculator

Optical Spectroscopy Mode Version P115
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 FLI: Airmass:
Almanac
Time
Time step forward/back



Target
Target coordinates Name or ID:  
α      δ     
UT rise
culm.
set
Hour Angle azimuth altitude zenith distance airmass FLI moon/sun
phase angle
moon/target
separation
Target
Moon
Sun
An advanced almanac is available in the ESO SkyCalc sky model calculator
PWV:     mm     Probability % of realising the PWV ≤ 10.00 mm
Seeing/Image Quality:
Turbulence Category:   (FWHM of the atmospheric PSF outside the telescope at zenith at 500 nm)
IQ: arcsec FWHM at the airmass and reference wavelength
              The corresponding seeing and turbulence category will be indicated in the output page
Image Quality is not a parameter in AO modes


Instrumental Setup

Slit width:
Grism:
Detector: CCD#40 Readout mode: Binning: (spectral)×(spatial)
Polarimetry Mode: No polarimetry Linear 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