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Testing and Data Reduction
of CSTAR
ZHOU, Xu
Chinese Center for Antarctic Astronomy
2009.7.17 beijing NAOC

Chinese Small Telescope Array (CSTAR)
• 4 telescopes with diameter 15cm, 1Kx1K CCD
each, 5x5 square degrees view, all point to the
south pole (near the zenith ).
• With g, r, i and none filters, without any
mechanical moveable instrument.
• Constant observation for more than 4 months,
take pictures every 20s.

Science Purposes
• Site Testing: Transparency, background light,
cloud, etc.
• Statistic of the variables in this area.
• Variables with photometer and color, etc.
• Light curves of variables
• SNe, Novae, Orphan afterglows of γoutburst.
• Search for extrasolar planets.

The CSTAR enclosure in
Xnglong Station of NAOC
The optical Design of
CSTAR

The transmission curve of CSTAR filters

The Quantum Efficiency of the CCD

低 温 测 试 CCD 相 机 和 两 种 宽 温 工 控 机 组 合
( 国 家 天 文 台 空 间 实 验 室 2007 年 2 月 1 日 )
陈 志 远
蒋 兆 基
周 旭
吴 江 华
李 奇 生

Andor CCD 相 机 可 以 在 ‐80.0 摄 氏 度 工 作
该 工 空 机 组 合 在 ‐30 度 低 温 下 无 法 启 动

高 原 低 压 低 温 数 据 采 集 系 统 整 体 测 试
地 点 : 卡 拉 苏 ( 中 国 哈 萨 克 斯 坦 边 境 )
中 午 将 相 机 对 准 北 极
交 换 工 控 机 组 合
数 据 采 集 系 统 室 外 部 分
数 据 采 集 系 统 室 内 部 分

The CSTAR Control Computers

CSTAR 试 观 测
江 苏 盱 眙

CSTAR 试 观 测
河 北 兴 隆

The Flat‐fields of the four CSTAR telescopes

The further Flat‐fields correction of the four CSTAR telescopes

An Image of North pole and the variables detected

The Andor DV435 1kx1k frame transfer CCD

The images of the Bias of four CSTAR Cameras

Astronomical Instruments at Departure Station

CSTAR installed at Dome A

2009 年 1 月

An Image from CSTAR

The comparison of the USNO‐B1 i magnitudes and the CSTAR
i‐band instrument magnitude of 25 stars. We can use the
mean subtraction to do the flux calibration for the CSTAR
images.

The magnitude differences between two images. The error
bar represent dispersion in RMS. The two lines represent the
mag=0.1, which is corresponding to the limiting magnitude at
S/N=10.

The limiting magnitude distribution for one whole day
images on May 12, 2008

The integrated exposure time of the CSTAR for each month.

The
position
of
variable
objects

A Binary !

10 days variation of sky brightness

The variation of atmospheric extinction

The Statistics of the Atmospheric Extinction

The Statistics of Sky Background brightness

Relation between Sky brightness and Moon
sky = 20.23 ‐ 10^(‐1.386 + 1.065*m)

Relation between Sky Brightnes and Sun level:
sky = 20.29 ‐ 10^(‐0.6421 + 0.01931*s