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VLTI Calibrator Selector

General description

The VLTI Calibrator Selector Tool is a tool intended to assist in the selection of suitable interferometric calibrators for VLTI observations with PIONIER and GRAVITY. It uses a model of the VLTI and its instruments to assess the fringe visibility, given the observed bandpass, the geometry, spectrum, and coordinates of the target and the time at which the observations are to be made. It also takes into account shadowing by telescope structures and the maximum available stroke of the delay lines for the feasibility assessment of the observations.

The tool offers an HTML/Java based interface and consists of two pages. The observation parameters page presents the entry fields and widgets for the target spectrum and geometry, time of observation, instrument configuration and results selection. A "Submit" button submits the parameters to the model executed on the ESO Web server. The results page presents the computed results. The optional graphs are displayed within Java applets allowing interactive manipulation. The results are also provided in ASCII and GIF formats for further analysis and printing. Finally, a summary of the input parameters is appended to the result page.


In this section, the instrument and mode must be selected. Instrument description and additional information is available for VLTI.

Target Definition

In this section, the spectrum and geometry of the target to be observed must be defined.

Observation Setup

User Search Criteria


Using the default values in the html input page an example of the calculations can be seen using the 'MAPLE' application

Send comments and questions to usd-help@eso.org