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SINFONI Exposure Time Calculator

Infrared Adaptive Optics Spectroscopy Mode Version 5.1.0
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Target Input Flux Distribution

Template Spectrum: Spectral Type:

Target Magnitude (Vega System):
Magnitudes are given per arcsec2 for extended sources.

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 (per pixel)
Extended Source, area Ω: arcsec2
The magnitude (or flux) is always given per arcsec2 for extended sources.

Reference Source Parameters

The ETC will not be able to compute performance estimates when the effective separation between the science target and the guide star is larger than 30"(NGS) or 60" (TTS in LGS), respectively.

Adaptive Optics:
noAO AO not enabled

Natural Guide Star

Target / Reference Source
Separation: arcsec. [0-30]
Reference Source
R mag: [9.3-16.3]
(Vega System)
B-R color:
(Vega System)
LGS Laser Guide Star LGS / TipTilt Star
Separation: arcsec [0-60]
TipTilt Star
R mag: [10-18 (in V)]
(Vega System)
B-R color:
(Vega System)
SE Seeing Enhanced

Sky Conditions

Airmass: X= (X ≥ 1)
Seeing FWHM
in V-band
Seeing(at X)= arcsec [0.4-1.4]. -Use this seeing in the phase I proposal and the OB constraints.
Seeing(at Zenith)= arcsec.
The seeing is assumed to scale with the airmass X like this: Seeing(X) = Seeing(Zenith) * X3/5.
The values in the two Seeing fields are mutually updated when one of the values changes. The field "Seeing(at Zenith)" also depends dynamically on the airmass value. To force an update of the dynamic fields, press here: . To revert the three fields to the default values, press here: .

Instrument Setup

Angular Resolution Scale: milliarcsec
Grating: Note for H+K (R=1500): The reference wavelength lies in a region with low atmospheric transmission and therefore the spectral plot should be activated in order to consult the spectral region of interest.


S/N ratio: S/N = DIT = sec
Exposure Time: NDIT =

The total exposure time is the product of DIT (Detector Integration Time) by NDIT (number of DITs). This exposure time does not take into account instrument and telescope overheads.

Plots: Toggle All / No Plots

Resultant spectrum including sky
Object Spectrum only
Sky Emission Spectrum
Sky Radiance Spectrum in physical units (ph/s/m2/micron/arcsec2)
Sky Transmission Spectrum
S/N as a function of wavelength
Total Efficiency and Wavelength Range
Input spectrum in physical units

Detailed S/N info

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