Optical Exposure Time Calculator

VLTI Visibility Calculator

HOME

INDEX

HELP

NEWS

Optical Interferometry Mode Version 4.1.3

Description.

F.A.Q

Performance

Expert Mode Switch to 'Call for Proposals' Mode

Target Definition

Target Coordinates:

  
  
  
  
 Declination:        deg min sec      Start:   HOUR ANGLE              Timespan:  hours

	
	
    
      
      *Date & Time information required ->
   
 Right Ascension:    hr min sec   Declination:  deg min sec
 Target Name:        Target name is passed to the Simbad Web App

      
      
      Observation Date & Time Start (UT):
Year:    Month:  Day:  
Hour:      Min:    Sec: 
Timespan:  hours
      
    
  

  
  Epoch: 2000 


Target Spectrum:
   Uniform:                       Constant over wavelength range
   Blackbody Temp:                 kelvin
   Stellar Template Spectra:        (* not suitable for Midi)
   Spectrum User Defined:          (ascii file .dat / .txt)
      Upload a spectrum file, verify upload, manually enter filename.
           
            



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:         
            Angles counted from North to East  
            BitsPerPixel must be -32, Maximum pixel size = 1000x1000.
            Upload a fits file, verify upload, manually enter filename & pixel scale below.
                 
            
                 Pixel Scale:   mas     Midi(5mas)

Observation Setup



Wavelength Domain:
   Filter:           
   Bandpass:         Central Wavelength  nm  FWHM:  nm
   MultiWavelength:        nm

Observatory Location:
   Location Paranal:      Latitude: -24.62794830      Longitude: -70.40479659
Offered configurations: 
 Maximum of 2 Triplet configurations or 1 Quadruplet 
     



All stations:

            



 


VLTI Station Positions


    



 



 

   Location UserDefined:   Latitude:     Longitude:  

Note - angles are counted positively from North to East

Baseline Length:         metres 
Baseline Angle:          degrees


Altitude:
  Min. Target Altitude:              degrees  
  Max. Sun Altitude:                 degrees

Special:
  Time between UV points:            mins  
  Max delay line difference:       ± metres

Results




 Input Parameters
 Input Fits Image (user upload required)

 Shadowing
 Delay Lines 

 Observation Time Window
 Target Altitude
 Target Azimuth
 Airmass
    
 UV Tracks
 UV Tracks (Over Fourier Transform)

 Visibility
 Visibility Squared
 Loss of Correlated Magnitude
 Baseline Length
 UV Azimuth

 Finito

 Illumination

 Process Executable Time

This software has been prepared in collaboration between ESO and the Jean-Marie Mariotti Centre (Grenoble, France) and written by Bruce Wiseman.