VLTI GRAVITY

VLTI Gravity Mode Version P101.3
Description
FAQ
 
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VLTI GRAVITY ETC

Mode:

Beam Combiner settings:
Scientific beam combiner spectral resolution:
Polarization splitting
Wavefront Sensor Type:

Fringe Tracking settings:
Fringe tracking frequency: Hz
Fringe tracking feasibility margin:

Science Object Properties


Target Spectrum:
Template Spectrum: Spectral Type: (only JHK) Target Magnitude and Mag.System:
= Vega
AB
Blackbody: Temperature: K
Upload Spectrum:
Supported formats: two-column ASCII, with wavelength unit nm
and a flux unit proportional to erg/cm2/s/A
Single Line:
Lambda: nm
Flux: 10-16 ergs/s/cm2
FWHM: nm

Target geometry:
Uniform Disc: Diameter: mas
Gaussian: FWHM: mas
Elliptical Gaussian: Major axis: mas
Minor axis: mas
Position Angle: deg (*)
Binary: Diameter, Primary: mas
Diameter, Secondary: mas
Separation: mas
Position Angle: deg (*)
Flux Fraction, Primary: (**)
Flux Fraction, Secondary: (**)
(*) angles counted from North to East
(**) Flux Fraction, Primary + Flux Fraction, Secondary = 1

Time constraints:
Start hour angle: hour
Duration: hours
Step: minutes

Fringe Tracking Object Properties


Spectrum:
Template Spectrum: Spectral Type: (only JHK) FT Object Magnitude and Mag.System:
= Vega
AB
Blackbody: Temperature: K
Upload Spectrum:
Supported formats: two-column ASCII, with wavelength unit nm
and a flux unit proportional to erg/cm2/s/A

Geometry:
Uniform disk angular diameter:mas
Distance from the science target:arcsec

Adaptive Optics Guide Star

The Strehl ratio set to a constant corresponding to the values below until COM1!
On-axis tracking (AO guide star is the same as FT object)
AO guide star/FT object separation: arcsec
AO guide star magnitude: in K-band

Sky Conditions

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
Override almanac sky parameters and use instead typical fixed sky model parameters except Moon phase and airmass
Moon FLI: Airmass:
Seeing/Image Quality:
Seeing: arcsec FWHM in V-band at zenith (use this value in the proposal)
              Probability ---% of realising the seeing ≤ 1.00 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

Baseline Configuration

Quadruplets: VLTI station layout
VLTI Station Positions

Results

Exposure Time: NDIT = DIT = sec Warning! NDIT and DIT are still experimental!!!

Plots: Toggle All / No Plots

Science object altitude Science object spectrum
Science object azimuth Science Spectrum in physical units
Visibility Science SED on the detector
Squared Visibility Fringe Tracking object spectrum
Airmass Sky Transmission Spectrum
Loss of Correlated Magnitude Sky Emission Spectrum
Baseline Length Science SNR as a function of wavelength(***)
Delay line limitations
Observability Constraints Fringe Tracking Feasibility (eta criterion)(***)
(***) Those results are still experimental and not fully verified.