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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.
References
PIONIER (VLTI) Wikipedia(Text) CC BY-SA