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 havings ... (When this option is selected the image quality selection in section 3 of the ITC is disabled.)
Gaussian profile with full width half maximum (including seeing) 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 (300 nm - 6 µm)
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 (GSAOI), telescope, and GeMS configuration

Instrument optical properties: (more info)
Detector properties: (more info)
Read mode:
Bright Objects (Low Noise Reads = 2, Read noise = 28e-)
Faint Objects / Broad band imaging (Low Noise Reads = 8, Read noise = 13e-)
Very Faint Objects / Narrow Band imaging (Low Noise Reads = 16, Read noise = 10e-)
Dark current:   0.01 e-/s/pix
Telescope configuration: (more info)
Mirror coating: silver
Wavefront sensor: Canopus WFS + GSAOI ODGW
The Strehl ratio is estimated from the selected filter and image quality. (more info)


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 arcsec
Cloud Cover: 50%/Clear 70%/Cirrus 80%/Cloudy Any mag
Water Vapor: 20%/Low 50%/Median 80%/High Any
Sky Background: 20%/Darkest 50%/Dark 80%/Grey Any/Bright
Airmass: <1.2 1.5 2.0


Details of observation

Calculation method: (more info)
Imaging calculation method (Spectroscopy not available here)
Total S/N ratio resulting from exposures each having coadds with 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 coadds, with a fraction of exposures that observe the source
Telescope offset:(more info)
Dither offset size: arcsec
Number of sky offsets >5 arcmin:
Analysis method: (more info)
Photometry in software aperture that gives 'optimum' S/N ratio
Photometry in sofware aperture of diameter arcsec