SOFI Exposure Time Calculator

Infrared Short Wavelength Imaging Mode Version 6.0.0
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

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

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