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Post Info TOPIC: Xinglong Observatory
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RE: Xinglong Observatory
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Title: Moon night sky brightness simulation for Xinglong station
Authors: Song Yao, Hao-Tong Zhang, Hai-Long Yuan, Yong-Heng Zhao, Yi-Qiao Dong, Zhong-Rui Bai, Li-Cai Deng, Ya-Juan Lei

With a sky brightness monitor in Xinglong station of National Astronomical Observatories of China (NAOC), we collected data from 22 dark clear nights and 90 lunar nights. We first measured the sky brightness variation with time in dark nights, found a clear correlation between the sky brightness and human activity. Then with a modified sky brightness model of moon night and data from moon night, we derived the typical value for several important parameters in the model. With these results, we calculated the sky brightness distribution under a given moon condition for Xinglong station. Furthermore, we simulated the moon night sky brightness distribution in a 5 degree field of view telescope (such as LAMOST). These simulations will be helpful to determine the magnitude limit, exposure time as well as the survey design for LAMOST at lunar night.

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Blobrana


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Title: The Development of Single Star Scidar for Tibet and Dome A
Authors: Li-Yong Liu, Yong-Qiang Yao, Jean Vernin, Hong-Shuai Wang, Jia Yin, Xuan Qian

A Single Star Scidar system(SSS) has been developed for remotely sensing atmospheric turbulence profiles. The SSS consists of computing the spatial auto/cross-correlation functions of short exposure images of the scintillation patterns produced by a single star, and provides the vertical profiles of optical turbulence intensity C2n(h) and wind speed V(h). The SSS needs only a 40 cm aperture telescope, so that can be portable and equipped easily to field candidate sites. Some experiments for the SSS have been made in Beijing last year, successfully retrieving atmospheric turbulence and wind profiles from the ground to 30 km. The SSS observations has recently been made at the Xinglong station of NAOC, characterising atmospheric parameters at this station. We plan to automatise SSS instrument and run remote observation via internet; a more friendly auto-SSS system will be set up and make use at the candidate sites in Tibet and Dome A.

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Blobrana


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Posts: 131433
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Guo Shou Jing Telescope
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Title: The site conditions of the Guo Shou Jing Telescope
Authors: Song Yao, Chao Liu, Haotong Zhang, Licai Deng, Heidi Jo Newberg, Yueyang Zhang, Jing Li, Nian Liu, Xu Zhou, Jeffrey L. Carlin, Li Chen, Norbert Christlieb, Shuang Gao, Zhanwen Han, Jinliang Hou, Hsu-Tai Lee, Xiaowei Liu, Kaike Pan, Hongchi Wang, Yan Xu, Fan Yang

The weather at Xinglong Observing Station, where the Guo Shou Jing Telescope (GSJT) is located, is strongly affected by the monsoon climate in north-east China. The LAMOST survey strategy is constrained by these weather patterns. In this paper, we present a statistics on observing hours from 2004 to 2007, and the sky brightness, seeing, and sky transparency from 1995 to 2011 at the site. We investigate effects of the site conditions on the survey plan. Operable hours each month shows strong correlation with season: on average there are 8 operable hours per night available in December, but only 1-2 hours in July and August. The seeing and the sky transparency also vary with seasons. Although the seeing is worse in windy winters, and the atmospheric extinction is worse in the spring and summer, the site is adequate for the proposed scientific program of LAMOST survey. With a Monte Carlo simulation using historical data on the site condition, we find that the available observation hours constrain the survey footprint from 22h to 16h in right ascension; the sky brightness allows LAMOST to obtain the limit magnitude of V = 19.5mag with S/N = 10.

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Blobrana


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Posts: 131433
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Xinglong Observatory
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Title: The Photometric System of Tsinghua-NAOC 80-cm Telescope at NAOC Xinglong Observatory
Authors: Fang Huang, Jun-Zheng Li, Xiao-Feng Wang, Ren-Cheng Shang, Tian-Meng Zhang, Jing-Yao Hu, Yu-Lei Qiu, Xiao-Jun Jiang

Tsinghua-NAOC (National Astronomical Observatories of China) Telescope (hereafter, TNT) is an 80-cm Cassegrain reflecting telescope located at Xinglong observatory of NAOC, with main scientific goals of monitoring various transients in the universe such as supernovae, gamma-ray bursts, novae, variable stars, and active galactic nuclei. We present in this paper a systematic test and analysis of the photometric performance of this telescope. Based on the calibration observations on twelve photometric nights, spanning the period from year 2004 to year 2012, we derived an accurate transformation relationship between the instrumental ubvri magnitudes and standard Johnson UBV and Cousins RI magnitudes. In particular, the colour terms and the extinction coefficients of different passbands are well determined. With these data, we also obtained the limiting magnitudes and the photometric precision of TNT. It is worthwhile to point out that the sky background at Xinglong Observatory may become gradually worse over the period from year 2005 to year 2012 (e.g., ~21.4 mag vs. ~20.1 mag in the V band).

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