SOFI Exposure Time Calculator

Infrared Short Wavelength Imaging Mode Version P105
Description
FAQ
 
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Input Flux Distribution

 Uniform (constant with wavelength)
 Blackbody: Temperature:  Kelvin

Object Magnitude:  Vega  AB

 Single line
	Wavelength:  nm
	Flux:        10-16 ergs/s/cm2 (per arcsec2 for extended sources)
	FWHM:        nm 
Spatial Distribution: Point Source    Extended Source
Magnitudes are given per square arcsec for extended sources

Sky Conditions

Moon FLI: Airmass:
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:
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


Instrument Setup

Filter:
Wide Band:
Narrow Band:

Selecting the filter sets the observation band

Objective:

Results

S/N ratio: S/N: DIT: s
The minimum DIT is 0.0032 s
Exposure Time: NDIT:
NINT:

The total exposure time is the product of DIT (Detector Integration Time) by NDIT (number of DITs). Instrument and telescope overheads are not taken into account.

Plots:Toggle All / No Plots

Detector Illumination
S/N as a function of Exposure Time
Total Efficiency
S/N as a function of seeing (only for point-source)
Input spectrum in physical units
Sky spectrum
Sky transmission spectrum

Debug text output