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SOFI Exposure Time Calculator

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Infrared Short Wavelength Imaging Mode Version 6.0.0
Description.
F.A.Q
 
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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

Airmass:
Seeing: arcsec FWHM in V-band at zenith (use this value in the proposal). The seeing is irrelevant for extended sources.
Probability 60% for a seeing smaller or equal to the requested value
For point sources, the resulting Image Quality FWHM is modeled by the ETC considering the transfer functions of the atmosphere, telescope and instrument. See the helpfile for details.

Instrument Setup


Filter:
Selecting the filter sets the observation band


	 Wide Band:   
	 Narrow Band: 

Objective:

	



Detector

DIT:  sec 
Minimum DIT is 0.0032 s.

Results


 S/N ratio:             Plotting range:  %  

The total exposure time is the product of DIT (Detector Integration Time), NDIT (number of DITs), and NINT (number of integrations). This exposure time does not take into account instrument and telescope overheads.

 Exposure Time settings:
                  NDIT:  Plotting range:  %
                  NINT: 

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
 Details of Image Quality Calculations (only for pointsources) 


      

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