VIRCAM Exposure Time Calculator

Infrared Imaging Mode Version P104.1
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Target Input Flux Distribution

Template Spectrum Redshift
z =
Target Magnitude and Mag.System:   
= Vega
Magnitudes are given per arcsec2 for extended sources
MARCS Stellar Model
Upload Spectrum
Blackbody Temperature: K
Power Law Index:           F(λ) ∝ λindex
Emission 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

Override almanac sky parameters and use instead typical fixed sky model parameters except Moon phase and airmass
Moon FLI: Airmass:
Time step forward/back

Target coordinates Name or ID:  
α      δ     
UT rise
Hour Angle azimuth altitude zenith distance airmass FLI moon/sun
phase angle
An advanced almanac is available in the ESO SkyCalc sky model calculator
Seeing/Image Quality:
Seeing: arcsec FWHM in V-band at zenith (use this value in the proposal)
              Probability ---% of realising the seeing ≤ 1.00 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

Observing Setup

Detector on-chip integration time DIT = s (minimum DIT is 1.0 s)
Exposure Time: s
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
Debug text output
Show execution time details