Neat astrometry6/15/2023 The geometry of the focal plane (the location of all the pixels) will be measured to ~0.1nm, with a SIM derived metrology system. Also 1 uas over a ~2000 arcsec field means the geometry of the focal plane needs to be accurate/stable to 5e-10. To do this we need to calibrate the detector and the optical PSF to much higher accuracy than previously done. The NEAT (Nearby Earth Astrometric Telescope) mission is a proposition submitted to ESA for its 2010 call for M-size mission within the Cosmic Vision 2015-2025 plan 1. NEAT will centroid a star's position to 1e-5 pixels. Astrometry with the Hubble telescope CCD cameras has been demonstrated to 1/300 pixel. Conventional star trackers can centroid a star's image to 1/100 of a pixel. This talk describes the concept and the techniques used to advance the state of the art in a few areas by 2-3orders of magnitude. This level of performance is needed to search and detect an Earth twin around the nearest ~100 stars. NEAT is a long focus 1m telescope that does relative astrometry over ~0.6 deg field of view with an accuracy of ~0.8 uas (microarcsec) in 1 hr and a mission accuracy of 0.04 uas. The metrology technology developed for SIM however gave rise to the NEAT concept that can detect an Earth twin around ~100 of the nearest stars for potentially 1/4 of the cost of SIM-Lite. One of these SIM (Space Interferometry Mission) was recommended by two US astronomy decadal reports, but SIM-Lite at a cost of $1.2~1.6 B was not recommended in the 2010 decadal report. Many concepts have been proposed, most of them costing many billions of dollars. One of the most ambitious goals in early part of the 21 century is the detection of an Earth-twin planet in the habitable zone of a nearby star. Title: Nearby Exo-Earth AstrometricTelescope (NEAT) Speaker: Michael Shao(Jet Propulsion Laboratory, California Institute of Technology) Nearby Exo-Earth AstrometricTelescope (NEAT) DRAST (Division of Radio Astronomy Science and Technology )ĭRAST (Division of Radio Astronomy Science and Technology ).Selected planetary systems around nearby targets of specific interest (low-mass ![]() Might be allocated to improve the characterization of the architecture of Science program will encompass an astrometric survey of our 200 closest F-, G-Īnd K-type stellar neighbors, with an average of 50 visits. Reconfigurations (alternative option uses deployable boom). The proposed missionĪrchitecture relies on the use of two satellites operating at L2 for 5 years,įlying in formation and offering a capability of more than 20,000 Metrology fibers located at the primary mirror. With a large field of view made of small movable CCDs located around a fixedĬentral CCD, and an interferometric calibration system originating from The NEAT instrumentĭesign consists of an off-axis parabola single-mirror telescope, a detector Targets and a set of suitable reference stars in the field. Limits can be achieved by carrying out differential astrometry between the Planetary masses and the full orbital geometry for all the components of theĭetected planetary systems down to the Earth-mass limit. Such a survey mission would provide the actual NEAT is designed to carry out space-borneĮxtremely-high-precision astrometric measurements sufficient to detectĭynamical effects due to orbiting planets of mass even lower than Earth'sĪround the nearest stars. Thisįundamental goal can be achieved with a mission concept such as NEAT - the Several AUs would be a major milestone in extrasolar planets astrophysics. Sensitivity down to Earth-mass planets within their Habitable Zones out to ![]() Sample of solar-type stars (FGK dwarfs) in the Solar neighborhood with uniform ![]() Download a PDF of the paper titled High precision astrometry mission for the detection and characterization of nearby habitable planetary systems with the Nearby Earth Astrometric Telescope (NEAT), by Fabien Malbet and 51 other authors Download PDF Abstract: (abridged) A complete census of planetary systems around a volume-limited
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