VIRCAM Exposure Time Calculator
Infrared Imaging Mode
Version P103.2
Description
FAQ
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Target Input Flux Distribution
Template Spectrum
O9V (Pickles) (35900 K)
B0V (Pickles) (31500 K)
B3V (Pickles) (19000 K)
A0V (Pickles) (9480 K)
A2V (Pickles) ( 8810 K)
A5V (Pickles) ( 8160 K)
F0V (Pickles) ( 7020 K)
F2V (Pickles) ( 6750 K)
F5V (Pickles) ( 6530 K)
G0V (Pickles) ( 5930 K)
G2V (Pickles) ( 5830 K)
G5V (Pickles) ( 5560 K)
K0V (Pickles) ( 5240 K)
K2V (Pickles) ( 5010 K)
K4V (Pickles) ( 4560 K)
K5V (Pickles) ( 4340 K)
K7V (Pickles) ( 4040 K)
M0V (Pickles) ( 3800 K)
M2V (Pickles) ( 3530 K)
M3V (Pickles) ( 3380 K)
M4V (Pickles) ( 3180 K)
M5V (Pickles) ( 3030 K)
M6V (Pickles) ( 2850 K)
Redshift
z =
Target Magnitude and Mag.System:
V
Z
Y
J
H
K
=
Vega
AB
Magnitudes are given per arcsec
2
for extended sources
MARCS Stellar Model
==============================
Spherical Geometry (87 models)
==============================
Teff=4000 log(g)=-0.5 [Fe/H]= 0 M= 1
Teff=4000 log(g)= 0.0 [Fe/H]=-1 M= 1
Teff=4000 log(g)= 0.0 [Fe/H]=-1 M= 5
Teff=4000 log(g)= 0.0 [Fe/H]= 0 M= 1
Teff=4000 log(g)= 1.0 [Fe/H]=-4 M= 5
Teff=4000 log(g)= 1.0 [Fe/H]=-2 M= 1
Teff=4000 log(g)= 1.0 [Fe/H]=-2 M= 5
Teff=4000 log(g)= 1.0 [Fe/H]=-1 M= 1
Teff=4000 log(g)= 1.0 [Fe/H]=-1 M= 5
Teff=4000 log(g)= 1.0 [Fe/H]= 0 M= 1
Teff=4000 log(g)= 1.0 [Fe/H]= 0 M= 5
Teff=4000 log(g)= 2.0 [Fe/H]=-4 M= 1
Teff=4000 log(g)= 2.0 [Fe/H]=-4 M= 5
Teff=4000 log(g)= 2.0 [Fe/H]=-2 M= 1
Teff=4000 log(g)= 2.0 [Fe/H]=-1 M= 1
Teff=4000 log(g)= 2.0 [Fe/H]=-1 M= 5
Teff=4000 log(g)= 2.0 [Fe/H]= 0 M= 1
Teff=4000 log(g)= 2.0 [Fe/H]= 0 M= 5
Teff=4000 log(g)= 3.5 [Fe/H]=-4 M= 1
Teff=4000 log(g)= 3.5 [Fe/H]=-2 M= 1
Teff=4000 log(g)= 3.5 [Fe/H]=-1 M= 1
Teff=4000 log(g)= 3.5 [Fe/H]= 0 M= 1
Teff=4500 log(g)= 0.0 [Fe/H]=-1 M= 1
Teff=4500 log(g)= 0.0 [Fe/H]= 0 M= 1
Teff=4500 log(g)= 1.0 [Fe/H]=-2 M= 1
Teff=4500 log(g)= 1.0 [Fe/H]=-2 M= 5
Teff=4500 log(g)= 1.0 [Fe/H]=-1 M= 1
Teff=4500 log(g)= 1.0 [Fe/H]= 0 M= 1
Teff=4500 log(g)= 2.0 [Fe/H]=-2 M= 1
Teff=4500 log(g)= 2.0 [Fe/H]=-2 M= 5
Teff=4500 log(g)= 2.0 [Fe/H]=-1 M= 1
Teff=4500 log(g)= 2.0 [Fe/H]= 0 M= 1
Teff=4500 log(g)= 3.5 [Fe/H]= 0 M= 1
Teff=5000 log(g)= 0.0 [Fe/H]=-1 M= 1
Teff=5000 log(g)= 0.0 [Fe/H]=-1 M= 5
Teff=5000 log(g)= 0.0 [Fe/H]= 0 M= 1
Teff=5000 log(g)= 0.0 [Fe/H]= 0 M= 5
Teff=5000 log(g)= 1.0 [Fe/H]=-2 M= 1
Teff=5000 log(g)= 1.0 [Fe/H]=-2 M= 5
Teff=5000 log(g)= 1.0 [Fe/H]=-1 M= 1
Teff=5000 log(g)= 1.0 [Fe/H]=-1 M= 5
Teff=5000 log(g)= 1.0 [Fe/H]= 0 M= 1
Teff=5000 log(g)= 1.0 [Fe/H]= 0 M= 5
Teff=5000 log(g)= 2.0 [Fe/H]=-2 M= 1
Teff=5000 log(g)= 2.0 [Fe/H]=-1 M= 1
Teff=5000 log(g)= 2.0 [Fe/H]=-1 M= 5
Teff=5000 log(g)= 2.0 [Fe/H]= 0 M= 1
Teff=5000 log(g)= 2.0 [Fe/H]= 0 M= 5
Teff=5000 log(g)= 3.5 [Fe/H]= 0 M= 1
Teff=5500 log(g)= 0.0 [Fe/H]= 0 M= 1
Teff=5500 log(g)= 1.0 [Fe/H]=-2 M= 5
Teff=5500 log(g)= 1.0 [Fe/H]=-1 M= 1
Teff=5500 log(g)= 1.0 [Fe/H]= 0 M= 1
Teff=5500 log(g)= 2.0 [Fe/H]=-2 M= 1
Teff=5500 log(g)= 2.0 [Fe/H]=-1 M= 1
Teff=5500 log(g)= 2.0 [Fe/H]= 0 M= 1
Teff=5500 log(g)= 3.5 [Fe/H]= 0 M= 1
Teff=6000 log(g)= 1.0 [Fe/H]=-2 M= 1
Teff=6000 log(g)= 1.0 [Fe/H]=-2 M= 5
Teff=6000 log(g)= 1.0 [Fe/H]=-1 M= 1
Teff=6000 log(g)= 1.0 [Fe/H]=-1 M= 5
Teff=6000 log(g)= 1.0 [Fe/H]= 0 M= 1
Teff=6000 log(g)= 1.0 [Fe/H]= 0 M= 5
Teff=6000 log(g)= 2.0 [Fe/H]=-4 M= 1
Teff=6000 log(g)= 2.0 [Fe/H]=-1 M= 1
Teff=6000 log(g)= 2.0 [Fe/H]= 0 M= 1
Teff=6000 log(g)= 2.0 [Fe/H]= 0 M= 5
Teff=6000 log(g)= 3.5 [Fe/H]= 0 M= 1
Teff=6500 log(g)= 1.0 [Fe/H]=-2 M= 5
Teff=6500 log(g)= 1.0 [Fe/H]=-1 M= 1
Teff=6500 log(g)= 1.0 [Fe/H]= 0 M= 1
Teff=6500 log(g)= 2.0 [Fe/H]=-2 M= 1
Teff=6500 log(g)= 2.0 [Fe/H]= 0 M= 1
Teff=6500 log(g)= 3.5 [Fe/H]= 0 M= 1
Teff=7000 log(g)= 2.0 [Fe/H]=-1 M= 1
Teff=7000 log(g)= 2.0 [Fe/H]=-1 M= 5
Teff=7000 log(g)= 2.0 [Fe/H]= 0 M= 1
Teff=7000 log(g)= 2.0 [Fe/H]= 0 M= 5
Teff=7000 log(g)= 3.5 [Fe/H]=-1 M= 1
Teff=7500 log(g)= 2.0 [Fe/H]=-2 M= 1
Teff=7500 log(g)= 2.0 [Fe/H]=-1 M= 1
Teff=7500 log(g)= 2.0 [Fe/H]= 0 M= 1
Teff=7500 log(g)= 3.5 [Fe/H]=-1 M= 1
Teff=8000 log(g)= 2.0 [Fe/H]= 0 M= 1
Teff=8000 log(g)= 3.5 [Fe/H]=-2 M= 1
Teff=8000 log(g)= 3.5 [Fe/H]=-1 M= 1
Teff=8000 log(g)= 3.5 [Fe/H]= 0 M= 1
==============================
Plane Parallel Geometry,
log(g)=4.0 (50 models)
==============================
Teff=4000 [Fe/H]=-2
Teff=4000 [Fe/H]=-1
Teff=4000 [Fe/H]= 0
Teff=4000 [Fe/H]=0.5
Teff=4000 [Fe/H]= 1
Teff=4500 [Fe/H]=-4
Teff=4500 [Fe/H]=-2
Teff=4500 [Fe/H]=-1
Teff=4500 [Fe/H]= 0
Teff=4500 [Fe/H]=0.5
Teff=4500 [Fe/H]= 1
Teff=5000 [Fe/H]=-4
Teff=5000 [Fe/H]=-2
Teff=5000 [Fe/H]=-1
Teff=5000 [Fe/H]= 0
Teff=5000 [Fe/H]=0.5
Teff=5000 [Fe/H]= 1
Teff=5500 [Fe/H]=-4
Teff=5500 [Fe/H]=-2
Teff=5500 [Fe/H]=-1
Teff=5500 [Fe/H]= 0
Teff=5500 [Fe/H]=0.5
Teff=5500 [Fe/H]= 1
Teff=6000 [Fe/H]=-4
Teff=6000 [Fe/H]=-2
Teff=6000 [Fe/H]=-1
Teff=6000 [Fe/H]= 0
Teff=6000 [Fe/H]=0.5
Teff=6000 [Fe/H]= 1
Teff=6500 [Fe/H]=-4
Teff=6500 [Fe/H]=-2
Teff=6500 [Fe/H]=-1
Teff=6500 [Fe/H]= 0
Teff=6500 [Fe/H]=0.5
Teff=6500 [Fe/H]= 1
Teff=7000 [Fe/H]=-4
Teff=7000 [Fe/H]=-2
Teff=7000 [Fe/H]=-1
Teff=7000 [Fe/H]= 0
Teff=7000 [Fe/H]=0.5
Teff=7500 [Fe/H]=-1
Teff=7500 [Fe/H]= 0
Teff=7500 [Fe/H]=0.5
Teff=7500 [Fe/H]= 1
Teff=8000 [Fe/H]=-4
Teff=8000 [Fe/H]=-2
Teff=8000 [Fe/H]=-1
Teff=8000 [Fe/H]= 0
Teff=8000 [Fe/H]=0.5
Teff=8000 [Fe/H]= 1
===============================
Dwarfs (Plane Parallel Geometry):
===============================
Teff=6250 log(g)= +4.5 [Fe/H]=-3.00
Teff=6250 log(g)= +4.5 [Fe/H]=-4.00
Teff=6250 log(g)= +4.5 [Fe/H]=-5.00
===============================
Giants (Spherical Geometry):
===============================
Teff=5000 log(g)= +1.5 [Fe/H]=-3.00 M= 1.0
Teff=5000 log(g)= +1.5 [Fe/H]=-4.00 M= 1.0
Teff=5000 log(g)= +2.0 [Fe/H]=-3.00 M= 1.0
Teff=5000 log(g)= +2.0 [Fe/H]=-4.00 M= 1.0
Teff=5000 log(g)= +2.0 [Fe/H]=-5.00 M= 1.0
Upload Spectrum
Select...
Blackbody
Temperature:
K
Power Law
Index:
F(λ) ∝ λ
index
Emission Line
Lambda:
nm
Flux:
10
-16
ergs/s/cm
2
(per arcsec
2
for extended sources)
FWHM:
nm
Spatial Distribution:
Point Source
Extended Source
diameter:
arcsec
Extended Source (per pixel)
Instrument Setup
Filter:
Z
Y
J
H
Ks
NB118
Sky Conditions
Override almanac sky parameters and use instead typical fixed sky model parameters except Moon phase and airmass
Moon FLI:
Airmass:
Almanac
Time
UT
Time step forward/back
sec
min
hour
day
week
month
year
MJD
Target
Target coordinates
Name or ID:
α
°
δ
°
toggle units
UT rise
culm.
set
Hour Angle
azimuth
altitude
zenith distance
airmass
FLI
moon/sun
phase angle
moon/target
separation
Target
Moon
Sun
An
advanced almanac
is available in the ESO SkyCalc sky model calculator
Seeing/Image Quality:
The seeing and image quality are irrelevant for extended sources
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):
1x1
2x2
Jitter pattern
(Njitter):
Number of pawprints
(Npaw):
1
3
6
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
Send questions and comments to
usd-help@eso.org
