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NEAT is an astrometric mission proposed to ESA with the objectives ofdetecting Earth-like exoplanets in the habitable zone of nearby solar-typestars. NEAT requires the capability to measure stellar centroids at theprecision of 5e-6 pixel. Current state-of-the-art methods for centroidestimation have reached a precision of about 2e-5 pixel at two times Nyquistsampling, this was shown at the JPL by the VESTA experiment. A metrology systemwas used to calibrate intra and inter pixel quantum efficiency variations inorder to correct pixelation errors. The European part of the NEAT consortium isbuilding a testbed in vacuum in order to achieve 5e-6 pixel precision for thecentroid estimation. The goal is to provide a proof of concept for theprecision requirement of the NEAT spacecraft. In this paper we present themetrology and the pseudo stellar sources sub-systems, we present a performancemodel and an error budget of the experiment and we report the present status ofthe demonstration. Finally we also present our first results: the experimenthad its first light in July 2013 and a first set of data was taken in air. Theanalysis of this first set of data showed that we can already measure the pixelpositions with an accuracy of about 1e-4 pixel.

First experimental results of very high accuracy centroiding measurements for the neat astrometric mission