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Astrometric calibration of the Xuyi Schmidt Telescope Photometric Survey of the Galactic Anti-center (XSTPS-GAC)
Zhang, Hui-Hua1; Liu, Xiao-Wei1,2; Yuan, Hai-Bo2; Zhao, Hai-Bin3; Yao, Jin-Sheng3; Zhang, Hua-Wei1; Xiang, Mao-Sheng1; Huang, Yang1
2014-04-01
Source PublicationRESEARCH IN ASTRONOMY AND ASTROPHYSICS
ISSN1674-4527
Volume14Issue:4Pages:456-470
AbstractWe present astrometric calibration of the Xuyi Schmidt Telescope Photometric Survey of the Galactic Anti-center (XSTPS-GAC). XSTPS-GAC is the photometric part of the Digital Sky Survey of the Galactic Anti-center (DSS-GAC), which is a photometric and spectroscopic sky survey, in combination with LAMOST. In order to select an astrometric reference catalog, we made comparisons between the four widely used astrometric catalogs, GSC2.3, USNO-B1.0, UCAC3 and PPMXL. PPMXL shows relatively small systematic errors in positions and more homogeneous proper motion distributions toward the Galactic Anti-center (GAC), and was selected as the reference catalog. Based on the high quality and bright reference stars that were picked out from PPMXL, we performed a 4th-order polynomial fitting in image units, to construct the transformation relation between coordinates used by XSTPS-GAC and standard coordinates, and to simultaneously correct the image distortions in the CCD. Then we applied the derived relation to all sources to obtain their mean celestial coordinates based on the International Celestial Reference System. For bright point sources with r < 17.0 mag, the accuracy of astrometric calibration could reach about 80 mas for each of the g, r, i bands, with systematic errors being less than 10 mas. But for the faint sources at the brightness limit of the survey, which was r similar to 19.0 mag, the accuracy can still reach 200 mas. After combining all observations, the final weighted average coordinates could reach an accuracy of less than 70 mas for bright stars. For faint stars, the rms residuals of weighted coordinates decrease to similar to 110 mas. The final combined XSTPS-GAC coordinates show a good consistency with the Sloan Digital Sky Survey.
KeywordAstrometry Methods: Data Analysis Surveys
WOS HeadingsScience & Technology ; Physical Sciences
DOI10.1088/1674-4527/14/4/007
WOS KeywordDIGITAL SKY SURVEY ; USNO-B CATALOG ; SURVEY 2MASS ; BATC SURVEY ; PROGRAM ; UCAC3
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Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000333689000007
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Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/10666
Collection盱眙天文观测站
Affiliation1.Peking Univ, Dept Astron, Beijing 100871, Peoples R China
2.Peking Univ, Kavli Inst Astron & Astrophys, Beijing 100871, Peoples R China
3.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Peoples R China
Recommended Citation
GB/T 7714
Zhang, Hui-Hua,Liu, Xiao-Wei,Yuan, Hai-Bo,et al. Astrometric calibration of the Xuyi Schmidt Telescope Photometric Survey of the Galactic Anti-center (XSTPS-GAC)[J]. RESEARCH IN ASTRONOMY AND ASTROPHYSICS,2014,14(4):456-470.
APA Zhang, Hui-Hua.,Liu, Xiao-Wei.,Yuan, Hai-Bo.,Zhao, Hai-Bin.,Yao, Jin-Sheng.,...&Huang, Yang.(2014).Astrometric calibration of the Xuyi Schmidt Telescope Photometric Survey of the Galactic Anti-center (XSTPS-GAC).RESEARCH IN ASTRONOMY AND ASTROPHYSICS,14(4),456-470.
MLA Zhang, Hui-Hua,et al."Astrometric calibration of the Xuyi Schmidt Telescope Photometric Survey of the Galactic Anti-center (XSTPS-GAC)".RESEARCH IN ASTRONOMY AND ASTROPHYSICS 14.4(2014):456-470.
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