The Precision Integrated-Optics Near-infrared Imaging ExpeRiment (PIONIER) is a visiting instrument at the ESO's Paranal Observatory,[1] part of the VLTI astronomical observatory. It combines the light from four telescopes simultaneously and provide 0.002 arc seconds of angular resolution, the equivalent angular resolution of a 100 m telescope.[citation needed]
PIONIER has been built at LAOG and has been installed at VLTI in November 2010.[citation needed]
Original source: https://en.wikipedia.org/wiki/PIONIER (Very Large Telescope).
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