NACO Exposure Time Calculator

Infrared Adaptive Optics Spectroscopy Mode Version 6.0.0
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

Airmass:
Seeing/Image Quality:
A model of the AO-corrected PSF is used to define the S/N reference area. See the helpfile for details.
Seeing: arcsec FWHM in V-band at zenith (use this value in the proposal)
              Probability ---% of realising the seeing ≤ 0.80 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

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)