Physics – Optics
Scientific paper
Jan 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005esasp.576..487y&link_type=abstract
"Proceedings of the Gaia Symposium "The Three-Dimensional Universe with Gaia" (ESA SP-576). Held at the Observatoire de Paris-Me
Physics
Optics
Jasmine, Optics, Astrometry
Scientific paper
We have investigated the optical design for the Japanese astrometry satellite mission (JASMINE). In order to accomplish measurements of astrometric parameters with high accuracy, optics with a long focal length and a wide focal plane for astrometry is required. In 1977, Korsch proposed a three mirror system with a long focal length and a wide focal plane. The Korsch system is one of the convincing models. However, the centre of the field is totally vignetted because of the fold mirror. Therefore we consider the improved Korsch system in which the centre of the field is not vignetted. Finally we obtain the diffraction limited optical design with small distortion. Our project needs a common astrometric technique to obtain precise positions of star images on solid state detectors to accomplish the objectives. In order to determine the centres of stars, an image of the point source must be focused onto the CCD array with a spread of a few pixels. The distribution of photons (photoelectrons) over a set of pixels enables us to estimate positions of stars with subpixel accuracy. We modify the algorithm to estimate the real positions of stars from the photon weighted mean, which is originally developed by the FAME (Full-Sky Astrometric Mapping Explorer) group. Finally, we obtain the results from the experiment that the accuracy of estimation of distance between two stars is about a variance of 1/300 pixel, that is, the error for one measurement is about 1/300 pixel, which is almost an ideal result given by Poisson noise of photons. We also investigate the accuracy of estimation of positions with a different size of PSF. In this case also, we obtain that the accuracy of estimation is about a variance of 1/300 pixel.
Araki Huzihiro
Asari Kazuyoshi
Gouda Naoteru
Hanada Yamada Y. H.
Kawano Naomi
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