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VIRCAM Exposure Time Calculator

Infrared Imaging Mode Version 6.0.0
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Input Flux Distribution

Uniform (constant with wavelength) Target Magnitude and Mag.System:
= Vega
Magnitudes are given per arcsec2
for extended sources.
Stellar template spectrum: Spectral Type :
Blackbody : Temperature : K
Single Line :
Lambda: nm
Flux: 10-16 ergs/s/cm2 (per arcsec2 for extended sources)
FWHM: nm

Spatial Distribution:

Point Source  
Extended Source diameter (arcsec):  
Extended Source (per pixel)

Instrument Setup


Sky Conditions

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.

Observing Setup

Detector on-chip integration time DIT = sec (Note: minimum DIT is 1.0 sec)
Exposure Time:
S/N ratio:
Observation Strategy:
       Exposure coadds (Ndit):
       Exposure loops (Nexp):
       Microstepping pattern (NxM):
       Jitter pattern (Njitter):
       Number of pawprints (Npaw):

Plots: Toggle All / No Plots

Input spectrum in physical units
CCD Illumination, Object only
Sky Radiance Spectrum in physical units (ph/s/m2/micron/arcsec2)
Total Background Emission Spectrum
Sky Transmission Spectrum
System Efficiency
S/N as a function of Exposure Time
Details of Image Quality Calculations (only for pointsources)

Detailed S/N info

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