摘要
Expected to be of the highest survey power telescope in the northern hemisphere,the Wide Field Survey Telescope(WFST)will begin its routine observations of the northern sky since 2023.WFST will produce a lot of scientific data to support the researches of time-domain astronomy,asteroids and the solar system,galaxy formation and cosmology and so on.We estimated that the 5σlimiting magnitudes of WFST with 30 s exposure are u=22.31mag,g=23.42 mag,r=22.95 mag,i=22.43 mag,z=21.50 mag,w=23.61 mag.The above values are calculated for the conditions of airmass=1.2,seeing=075,precipitable water vapor=2.5 mm and Moon-object separation=45°at the darkest New Moon night of the Lenghu site(V=22.30 mag,Moon phaseθ=0°).The limiting magnitudes in different Moon phase conditions are also calculated.The calculations are based on the empirical transmittance data of WFST optics,the vendor provided CCD quantum efficiency,the atmospherical model transmittance and spectrum of the site.In the absence of measurement data such as sky transmittance and spectrum,we use model data.
作者
雷磊
朱青峰
孔旭
王挺贵
郑宪忠
师冬冬
范璐璐
刘伟
Lei Lei;Qing-Feng Zhu;Xu Kong;Ting-Gui Wang;Xian-Zhong Zheng;Dong-Dong Shi;Lu-Lu Fan;Wei Liu(School of Astronomy and Space Science,University of Science and Technology of China,Hefei 230026,China;Purple Mountain Observatory,Chinese Academy of Sciences,Nanjing 210023,China;Deep Space Exploration Laboratory/Department of Astronomy,University of Science and Technology of China,Hefei 230026,China)
基金
supported by the Strategic Priority Research Program of Chinese Academy of Sciences(grant Nos.XDB 41000000 and XDB 41010105)
the National Science Foundation of China(NSFC,grant Nos.12233008,12173037 and 11973038)
the China Manned Space Project(No.CMS-CSST-2021-A07)
the Cyrus Chun Ying Tang Foundations。
