Pionier (Very Large Telescope)

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]}

• Lists of telescopes

• ipag.osug.fr/twiki/bin/view/Ipag/Projets/Pionier/WebHome IPAG (Grenoble) - PIONIER project home
• http://www.osug.fr OSUG Grenoble – PIONIER instrument
• www.eso.org/sci/facilities/paranal/instruments/pionier.html ESO PIONIER – instrument description
• www.eso.org/sci/facilities/paranal/telescopes/vlti/index.html ESO VLTI – about the interferometer at the VLT

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