Astronomical source definition

Spatial profile and brightness:(more info)
Choose one of point, extended or user-defined source profile and the brightness in any filter/wavelength
Point source (nominal PSF) with spatially integrated brightness (e.g. 19.3 mag or 2e-17 W/m²/µm)
Extended source having ...(When this option is selected the image quality selection in section 3 of the ITC is disabled.)
  Gaussian profile with full width half maximum of arcsec and spatially integrated brightness of (e.g. 19.3 mag or 2e-17 W/m²/µm)
  Uniform surface brightness (e.g. 21.6 mag/arcsec²)
with the above brightness normalisation applied in filter band


Spectral distribution: (more info)
Choose one SED, the redshift and extinction
Library spectrum of a non-stellar object
Library spectrum of a star with spectral type
Single emission line at wavelength micron with line flux and line width km/s on a flat (in wavelength) continuum of flux density
Model black body spectrum with temperature K
Model power-law spectrum (S_lambda = lambda ^ )
User-defined spectrum read from file (size < 1MB)
with the spectrum mapped to a redshift z = or a radial velocity v = km/s


Instrument (Acquisition Camera) and telescope configuration

Instrument optical properties:(more info)
Colour filter: Neutral density (ND) filter:
Detector properties:(more info)
CCD readout noise of 6 e-
CCD dark current of 20 e-/s
No CCD binning; camera plate scale is 0.12 arcsec/pixel
Telescope configuration:(more info)
M2 mirror coating: aluminium  silver
Instrument port: up-looking (2 reflections) (only)
Wavefront sensor for tip-tilt compensation: PWFS (only)


Observing condition constraints

Note: you should read the explanatory notes for the meaning of the percentiles and to ensure that your selected conditions are appropriate for the observing wavelength. Further details are available on the observing condition constraints pages.
Image quality: 20%/Best 70%/Good 85%/Poor Any
Sky transparency (cloud cover): 50%/Clear 70%/Cirrus 80%/Cloudy Any
Sky transparency (water vapour): 20%/Low 50%/Median 80%/High Any
Sky background: 20%/Darkest 50%/Dark 80%/Grey Any/Bright
Typical air mass during observation: <1.2 1.5 2.0


Details of observation

Calculation method:(more info)
Total S/N ratio resulting from exposures each having an exposure time of secs and with a fraction of exposures that observe the source
Total integration time to achieve a S/N ratio of using an exposure time for each exposure of secs and with a fraction of exposures that observe the source
Analysis method: (more info)
Software aperture that gives 'optimum' S/N ratio and with a sky aperture times the target aperture
Software aperture of diameter (or slit length) arcsec and with a sky aperture times the target aperture