An accuracy of 3e-4 pixel was obtained for the relative positions of artificial stars and we have determined that measures of pixel positions by the metrology is currently limited by stray light. I am going to present the testbed itself, the data analysis methods and the results. The second aspect of the PhD is relative to the testbed, which mimics the NEAT telescope configuration. Regarding the scientific case, I compiled a catalog of mission target stars and reference stars (needed for the differential astrometric measurements) and I estimated the scientific return of NEAT-like missions in terms of number of detected exoplanets and their parameter distributions. The NEAT performance limits can be achieved by carrying out differential astrometry between the targets and a set of suitable reference stars in the field. Also possibility to enter Triton orbit (similar to JUICE at Ganymede) with a v300 m/s. Flyby altitudes between 1 km with sufficient v to raise or lower as necessary. During my PhD, my activities were related to astrophysical aspects as well as instrumental aspects of the mission. Neptune planetary tour 24/32 Triton flyby ground tracks and orbit 25/32 Tour includes phases where the spacecraft orbits in Triton’s orbital plane. A laboratory testbed called NEAT-demo was assembled at IPAG, its main goal is to demonstrate CCD detector calibration to the required accuracy. A mission called NEAT (Nearby Earth Astrometric Telescope) has been proposed to ESA in 2010. A scientific consortium has formed to promote this kind of astrometric space mission. Finding habitable Earths in the Solar neighborhood would be a major step forward for exoplanet detection and these planets would be prime targets for attempting to find life outside of the Solar System, by searching for bio-markers in their atmospheres. From space, it is possible to use differential astrometry around nearby Solar-type stars to detect exoplanets down to one Earth mass in habitable zone, where the sensitivity of the technique is optimal. This technique is used frequently and is very successful to determine the masses and the orbits of binary stars. Astrometry, by measuring the reflex effect of planets on their central host stars, lead us to the mass of planets and to their orbit determination. Measurements can be obtained by the optical ground terminals for navigation.With the present state of exoplanet detection techniques, none of the rocky planets of the Solar System would be discovered, yet their presence is a very strong constraint on the scenarios of formation of planetary systems. Spacecraft while they are downlinking data via their high rate opticalĬommunication laser beams, our approach shows precision plane-of-sky Tracking of near-Earth asteroids as a proxy for observations of future Resulting in higher astrometric precision than the 100 mas level astrometryįrom traditional approach of using long exposure images. Technique avoids the trailing loss and keeps the jitter effects from atmosphereĪnd telescope pointing common between the asteroid and reference stars, Track both target asteroid and reference stars across the field of view. ESA for its 2010 call for M-size mission within the Cosmic Vision 2015-2025. ASTROMETRIC OBSERVATIONS OF MINOR PLANETSThis is our third paper in a. We used the technique of synthetic tracking, in which many shortĮxposure (1 second) images are acquired and then combined in post-processing to The NEAT (Nearby Earth Astrometric Telescope) mission is a proposition submitted to. Key words:minor planets, asteroids: search, near-Earth objects, astrometry,orbits1. Using the Pomona College 40 inch telescope, at the JPL's Table Mountainįacility. This paper reports on aĭemonstration of 10 milliarcsecond-level astrometric precision on a dozen NEAs (NEAs) and therefore better tracking them. Download a PDF of the paper titled Accurate Ground-based Near-Earth-Asteroid Astrometry using Synthetic Tracking, by Chengxing Zhai and 15 other authors Download PDF Abstract: Accurate astrometry is crucial for determining orbits of near-Earth-asteroids
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