VLTI GRAVITY

VLTI Gravity Mode Version P100.2
Description
FAQ
 
The page is loading... please wait!

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

Target coordinates:
HMS: Right Ascension: hh mm ss Declination: dd mm ss
Degrees Right Ascension: deg (decimal) Declination: deg (decimal)
Simbad: Target Name: Target coords found using Simbad Web App

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

Baseline Configuration

Quadruplets: VLTI station layout
VLTI Station Positions

Sky Conditions

Airmass:
Seeing: arcsec FWHM in V-band at zenith. (use this value in the proposal)
Probability 87% for a seeing smaller or equal to the requested value

Atmosheric Coherence Time: ms

Results

Exposure Time: NDIT = DIT = sec
S/N ratio:
(S/N option currently not available)
S/N = DIT = sec
Exposure Time: NDIT =


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.