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Preliminary results of centroiding experiment for the STEP mission
Li, Haitao; Li, Baoquan; Cao, Yang; Chen, Ding; Li, Ligang; Li, HT (reprint author), Chinese Acad Sci, Natl Space Sci Ctr, Beijing, Peoples R China.
Department空间环境部
Source Publication2015 INTERNATIONAL CONFERENCE ON OPTICAL INSTRUMENTS AND TECHNOLOGY: OPTOELECTRONIC IMAGING AND PROCESSING TECHNOLOGY
2015
Pages96221A
Language英语
ISSN0277-786X
ISBN978-1-62841-803-3
AbstractSearch 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.
KeywordStep Exoplanets Centroiding Linear Corrected Photon Weighted Means Gauss Fitting
Conference NameInternational Conference on Optical Instruments and Technology - Optoelectronic Imaging and Processing Technology
Conference DateMAY 17-19, 2015
Conference PlaceBeijing, PEOPLES R CHINA
Indexed ByEI ; CPCI
Document Type会议论文
Identifierhttp://ir.nssc.ac.cn/handle/122/4551
Collection空间环境部
Corresponding AuthorLi, HT (reprint author), Chinese Acad Sci, Natl Space Sci Ctr, Beijing, Peoples R China.
Recommended Citation
GB/T 7714
Li, Haitao,Li, Baoquan,Cao, Yang,et al. Preliminary results of centroiding experiment for the STEP mission[C]:SPIE-INT SOC OPTICAL ENGINEERING,2015:96221A.
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