Nearby Earths Astrometric Telescope = NEAT F. Malbet, A. Léger, M. Shao, R. Goullioud Poster 4.15.

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Presentation transcript:

Nearby Earths Astrometric Telescope = NEAT F. Malbet, A. Léger, M. Shao, R. Goullioud Poster 4.15

Differential astrometry Specifications: 0.30uas → 0.05 uas rms ==> ~ 0.8 uas/hr x 200 visits upsilon And (4.6) TYC2 2067(10.4) TYC (12.8) TYC (12.0) TYC (11.3) TYC2 478 (11.7) TYC (12.0) TYC (12.1) TYC (11.6) TYC2 352 (12.7) TYC (10.0) TYC2 707(12.2) TYC2 454(9.8) TYC2 602(10.1) TYC2 560 (11.6) TYC2 286 (11.1) TYC (12.0) TYC (12.0) TYC (11.5) TYC (10.2) TYC (10.8) TYC (11.3) TYC (10.6) TYC (10.0) 0.3°

Concept Metrology Off-axis parabolic mirror (D~1m) Focal plane array (FOV~0.6°, ∅ ~0.5m) Telescope spacecraft Detector spacecraft Focal length (~40m) Sun shades Free flyers

Metrology 1 fixed CCD 0.6° FOV, ~0.5m Focal plane 8 movable CCDs  calibrate the stellar image positions Metrology Young’s interference fringes Telescope spacecraft Detector spacecraft

Radial 1m/s Transit Ground-based Imaging Microlensing 50pc Astrometry 10pc DARWIN V E M J S U N M2 K2 G2 F2