NACO Exposure Time Calculator
Infrared Adaptive Optics Spectroscopy Mode Version P98-phase1, 6.0.1, May 06 2016
Description
FAQ
 
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Target Input Flux Distribution

Template Spectrum Redshift
z = 		Target Magnitude and Mag.System:   
= Vega
AB
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 (per pixel)

Adaptive Optics Mode:

LGSLaser Guide Star
NGS

Natural Guide Star

 Target / Reference Source
Separation: arcsec 		Reference Source
V mag: Spectral Type

Sky Conditions

Moon FLI: Airmass:
Almanac
Time
Time step forward/back


Target
Target coordinates Name or ID:  
α      δ     
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
PWV:     mm     Probability % of realising the PWV ≤ 10.00 mm
Seeing/Image Quality:
Turbulence Category:   (FWHM of the atmospheric PSF outside the telescope at zenith at 500 nm)
IQ: arcsec FWHM at the airmass and reference wavelength
              The corresponding seeing and turbulence category will be indicated in the output page
Image Quality is not a parameter in AO modes

Instrument Setup

NAOS WFS/Dichroic:
Dichroic Name Reflected light to the WFS
(Efficiency)		 Transmitted light to CONICA
(Efficiency)		 Conditions of use
VIS V,R,I [0.45 - 0.95] microns
(90%) 		J,H,K,L,M [1.05 - 5.0] microns
(90%) 		Near-IR observations
with optical WF sensing
N20C80 V,R,I,J,K [0.45 - 2.55] microns
(20%) 		V,R,I,J,H,K [1.05 - 5.0] microns
(80%) 		WF sensing and
observing in the IR
N90C10 V,R,I,J,K [0.45 - 2.55] microns
(90%) 		V,R,I,J,H,K [1.05 - 5.0] microns
(10%) 		WF sensing and
observing in the IR
JHK I,J,H,K [0.8 - 2.55] microns
(90%) 		L,M [2.8 - 5.5] microns
(90%) 		Thermal-IR observations
with WF sensing in the near-IR
K K [1.9 - 2.55] microns
(90%) 		J,H [0.45 - 1.8] microns
(90%) 		V,R,I,J,H observations
with WF sensing in K
FREE The NAOS-PS will try to find an optimal Dicroic/WFS combination. Note
Slit:
Grism/Filter Mode:
Instrument mode : (select Double_RdRstRd for LW).

Results

S/N ratio: S/N = DIT = s Please note the relevant minimum DIT in the manual.
Exposure Time: NDIT =

The total exposure time is the product of DIT (Detector Integration Time) by NDIT (number of DITs). Instrument and telescope overheads are not taken into account.

Plots: Toggle All / No Plots

Resultant spectrum including sky
Object Spectrum only
Sky Emission Spectrum
Sky Transmission Spectrum
S/N as a function of wavelength
Total Efficiency and Wavelength Range
Input spectrum in physical units
Point Spread Function (point source only)
Enslitted Energy (point source only)