VLTI Visibility Calculator

Interferometry VisCalc Call For Proposal Mode Version P114
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NOTE 1: GRAVITY and MATISSE users should use the dedicated GRAVITY and MATISSE ETC for visibility calculations and their feasibility.

NOTE 2: The Shadowing in VisCalc is not up-to-date compared to the one used in GRAVITY and MATISSE ETCs.

NOTE 3: The baseline configurations in VisCalc are those valid up to P110. For the latest configurations, please refer to the VLTI Configurations Overview and to the GRAVITY and MATISSE ETCs.

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Target Definition

Target Coordinates: Epoch: 2000

Declination: deg min sec   Start: HOUR ANGLE    Timespan: hours   Simbad Web App

Target Spectrum:

Uniform: Constant over wavelength range Blackbody Temp: kelvin

Target Geometry:

Single Disc: Diameter: mas Gaussian: FWHM: mas Binary Discs: Angle: deg Angles counted from North to East Separation: mas Diameter, Primary: mas Diameter, Secondary: mas Brightness Ratio: Fits: Pixel Scale: mas
Supported formats: FITS images. Bits per pixel must be 32, Maximum pixel size 1000x1000. Angles counted from North to East.

Observation Setup

  Offered configurations:         

VLTI Station Positions

VLTI station layout


 All results 

 Show Input Parameters
 Show Input Target Image (fits file upload required)

 Delay lines 

 Observation Time Window
 Target altitude
 Target Azimuth

 UV Tracks
 UV Tracks (Over Fourier Transform)
 UV Tracks (Constant Shape vs Wavelength)

 Visibility Squared
 Loss of Correlated Magnitude
 Baseline Length
 UV Azimuth

 Phase - Map 2D
 Phase - Baseline Specific
 Phase - Triplet Closure

 Finito (AMBER only)

This software has been prepared in collaboration between ESO and the Jean-Marie Mariotti Centre