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SINFONI Exposure Time Calculator

Infrared Adaptive Optics Spectroscopy Mode Version 6.0.0
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Target Input Flux Distribution

Template Spectrum: Spectral Type:

Target Magnitude: = Vega AB
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] B-R color:
LGS Laser Guide Star LGS / TipTilt Star
Separation: arcsec [0-60]
TipTilt Star
R mag: [10-18 (in V)] B-R color:
SE Seeing Enhanced

Sky Conditions

Seeing: arcsec FWHM in V-band at zenith (use this value in the proposal). The seeing is irrelevant for extended sources.
Probability 60% for a seeing smaller or equal to the requested value
For non-AO instrument modes, the S/N reference area is defined by the Image Quality. For AO-modes, a model of the AO-corrected PSF is used instead. For details see the helpfile.

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
Details of Image Quality Calculations (only for non-AO pointsources)

Detailed S/N info

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