28 August 2014 Evaluation of centroiding algorithm error for Nano-JASMINE
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Abstract
The Nano-JASMINE mission has been designed to perform absolute astrometric measurements with unprecedented accuracy; the end-of-mission parallax standard error is required to be of the order of 3 milli arc seconds for stars brighter than 7.5 mag in the zw-band(0.6μm-1.0μm) .These requirements set a stringent constraint on the accuracy of the estimation of the location of the stellar image on the CCD for each observation. However each stellar images have individual shape depend on the spectral energy distribution of the star, the CCD properties, and the optics and its associated wave front errors. So it is necessity that the centroiding algorithm performs a high accuracy in any observables. Referring to the study of Gaia, we use LSF fitting method for centroiding algorithm, and investigate systematic error of the algorithm for Nano-JASMINE. Furthermore, we found to improve the algorithm by restricting sample LSF when we use a Principle Component Analysis. We show that centroiding algorithm error decrease after adapted the method.
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Takuji Hara, Takuji Hara, Naoteru Gouda, Naoteru Gouda, Taihei Yano, Taihei Yano, Yoshiyuki Yamada, Yoshiyuki Yamada, } "Evaluation of centroiding algorithm error for Nano-JASMINE", Proc. SPIE 9143, Space Telescopes and Instrumentation 2014: Optical, Infrared, and Millimeter Wave, 914354 (28 August 2014); doi: 10.1117/12.2054850; https://doi.org/10.1117/12.2054850
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