Infrared Exposure Time Calculator

SINFONI Exposure Time Calculator

HOME

INDEX

HELP

NEWS

Infrared Adaptive Optics Spectroscopy Mode Version 3.2.7

Description.

F.A.Q

Performance

Target Input Flux Distribution

Template Spectrum:

Spectral Type:

Target Magnitude: =
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
NGS	Natural Guide Star	Target / Reference Source Separation: arcsecs. [0-30]	Reference Source
			R mag: [9.3-16.3]	B-R color:
LGS	Laser Guide Star	LGS / TipTilt Star Separation: arcsecs [0-60]	TipTilt Star
			R mag: [10-18 (in V)]	B-R color:
SE	Seeing Enhanced	This mode is currently not explicitly supported by the ETC, but the perfomance can be approximated using the LGS mode with a faint TipTilt star (R=18.0, B-R=0.0) and the largest possible LGS / TipTilt star separation for the chosen airmass.

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) * X^3/5.

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.

Results

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

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 telecope overheads.

On submission the model can generate the following graphs:
(input parameters are replicated in the output page)

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