Dr. Ding Chen Profile

Dr. Ding Chen

at National Space Science Ctr CAS

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Proceedings Article | 5 August 2015 Paper

Preliminary results of centroiding experiment for the STEP mission

Haitao Li, Baoquan Li, Yang Cao, Ding Chen, Ligang Li

Proceedings Volume 9622, 96221A (2015) https://doi.org/10.1117/12.2193363

KEYWORDS: Stars, Calibration, Planets, Sensors, Metrology, Space telescopes, Detection and tracking algorithms, Detector arrays, Quantum efficiency, Heterodyning

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Search for Terrestrial Exo-Planet (STEP)[1] was originally proposed in 2013 by the National Space Science Center, Chinese Academy of Sciences, which is currently being under background engineering study phase in China. The STEP mission is a space astrometry telescope working at visible light wavelengths. The STEP aims at the nearby terrestrial planets detection through micro-arcsecond-level astrometry. Determination of the separation between star images on a detector with high precision is very important for astrometric exoplanets detection through the observation of star wobbles due to planets. The requirement of centroiding accuracy for STEP is 1e-5 pixel. A centroiding experiment have been carried out on a metrology testbed in open laboratory. In this paper, we present the preliminary results of determining the separations between star images. Without calibration of pixel positions and intra-pixel response, we have demonstrated that the standard deviation of differential centroiding is below 7.4e-3 pixel by the algorithm of linear corrected photon weighted means(LCPWM)[2,3]. For comparison, the photon weighted means(PWM) and Gauss fitting are also used in the data reduction. These results pave the way for the geometrical calibration and the intra-pixel quantum efficiency(QE) calibration of detector array equipment for micro-pixel accuracy centroiding.

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