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Proceedings Paper

First experimental results of very high accuracy centroiding measurements for the neat astrometric mission
Author(s): A. Crouzier; F. Malbet; O. Preis; F. Henault; P. Kern; G. Martin; P. Feautrier; E. Stadler; S. Lafrasse; A. Delboulbé; E. Behar; M. Saint-Pe; J. Dupont; S. Potin; C. Cara; M. Donati; E. Doumayrou; P. O. Lagage; A. Léger; J. M. LeDuigou; M. Shao; R. Goullioud
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Paper Abstract

NEAT is an astrometric mission proposed to ESA with the objectives of detecting Earth-like exoplanets in the habitable zone of nearby solar-type stars. In NEAT, one fundamental aspect is the capability to measure stellar centroids at the precision of 5 × 10-6 pixel.

Current state-of-the-art methods for centroid estimation have reached a precision of about 2 × 10-5 pixel at two times Nyquist sampling, this was shown at the JPL by the VESTA experiment.1 A metrology system was used to calibrate intra and inter pixel quantum efficiency variations in order to correct pixelation errors.

The European part of the NEAT consortium is building a testbed in vacuum in order to achieve 5 × 10-6 pixel precision for the centroid estimation. The goal is to provide a proof of concept for the precision requirement of the NEAT spacecraft. In this paper we present the metrology and the pseudo stellar sources sub-systems, we present a performance model and an error budget of the experiment and finally we describe the present status of the demonstration.


Paper Details

Date Published: 26 September 2013
PDF: 15 pages
Proc. SPIE 8864, Techniques and Instrumentation for Detection of Exoplanets VI, 88641C (26 September 2013); doi: 10.1117/12.2025004
Show Author Affiliations
A. Crouzier, IPAG, CNRS, Univ. Joseph Fourier (France)
F. Malbet, IPAG, CNRS, Univ. Joseph Fourier (France)
O. Preis, Institut de Planétologie et d’Astrophysique de Grenoble (France)
F. Henault, IPAG, CNRS, Univ. Joseph Fourier (France)
P. Kern, IPAG, CNRS, Univ. Joseph Fourier (France)
G. Martin, IPAG, CNRS, Univ. Joseph Fourier (France)
P. Feautrier, IPAG, CNRS, Univ. Joseph Fourier (France)
E. Stadler, IPAG, CNRS, Univ. Joseph Fourier (France)
S. Lafrasse, IPAG, CNRS, Univ. Joseph Fourier (France)
A. Delboulbé, IPAG, CNRS, Univ. Joseph Fourier (France)
E. Behar, IPAG, CNRS, Univ. Joseph Fourier (France)
M. Saint-Pe, IPAG, CNRS, Univ. Joseph Fourier (France)
J. Dupont, IPAG, CNRS, Univ. Joseph Fourier (France)
S. Potin, IPAG, CNRS, Univ. Joseph Fourier (France)
C. Cara, Commissariat à l'Énergie Atomique et aux Energies Alternatives (France)
M. Donati, Commissariat à l'Énergie Atomique et aux Energies Alternatives (France)
E. Doumayrou, Commissariat à l'Énergie Atomique et aux Energies Alternatives (France)
P. O. Lagage, Commissariat à l'Énergie Atomique et aux Energies Altlernatives (France)
A. Léger, Institut d'Astrophysique Spatiale, Ctr. Univ. d'Orsa (France)
J. M. LeDuigou, Ctr. National d'Études Spatiales (France)
M. Shao, Jet Propulsion Lab. (United States)
R. Goullioud, Jet Propulsion Lab. (United States)


Published in SPIE Proceedings Vol. 8864:
Techniques and Instrumentation for Detection of Exoplanets VI
Stuart Shaklan, Editor(s)

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