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PIONIER, developed at LAOG/IPAG in Grenoble, France, is a visiting instrument at the ESO's Paranal Observatory.[1]

The Precision Integrated-Optics Near-infrared Imaging ExpeRiment (PIONIER) is an instrument for the VLTI astronomical observatory. It combines the light from four telescopes simultaneously and provide the equivalent angular resolution of a 100 m telescope.

PIONIER has been built at LAOG and has been installed at VLTI in November 2010. After few nights of commissioning, it is now routinely delivering science data.


  1. ^ "All Four VLT Unit Telescopes Working as One". ESO Picture of the Week. Retrieved 15 November 2011. 

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