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

2. Differential astrometry Specifications: 0.30uas → 0.05 uas rms ==> ~ 0.8 uas/hr x 200 visits upsilon And (4.6) TYC2 2067(10.4) TYC2 2176 (12.8) TYC2 1302 (12.0) TYC2 2188 (11.3) TYC2 478 (11.7) TYC2 1396 (12.0) TYC2 1969 (12.1) TYC2 1474 (11.6) TYC2 352 (12.7) TYC2 2010 (10.0) TYC2 707(12.2) TYC2 454(9.8) TYC2 602(10.1) TYC2 560 (11.6) TYC2 286 (11.1) TYC2 1424 (12.0) TYC2 1182 (12.0) TYC2 1246 (11.5) TYC2 1542 (10.2) TYC2 1867 (10.8) TYC2 1880 (11.3) TYC2 1716 (10.6) TYC2 1668 (10.0) 0.3°

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

4. 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

5. Radial velocities @ 1m/s Transit Ground-based Imaging Microlensing GAIA @ 50pc Astrometry 0.05uas @ 10pc DARWIN V E M J S U N M2 K2 G2 F2