鱼眼夜空成像仪:测量夜空亮度的校准工具

IF 3.3 3区 物理与天体物理 Q2 ASTRONOMY & ASTROPHYSICS
Li-Wei Hung, Jeremy White, Damon Joyce, Sharolyn J Anderson, Benjamin Banet
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引用次数: 0

摘要

美国国家公园管理局(NPS)夜空小组开发了一种配备鱼眼镜头的新型相机系统,用于测量夜空亮度。美国国家公园管理局的鱼眼夜空成像仪由安装在 ZWO ASI6200MM 相机中的背照式索尼 IMX455 CMOS 传感器、Johnson V 滤光片和 Sigma 8 mm F3.5 鱼眼镜头组成。所有部件均可在市场上买到。鱼眼镜头使我们能够在单幅画面中捕捉整个天空。广角镜头也带来了校准方面的挑战。为了解决这个问题,我们定制了工具,并设计了创新的方法来校准系统,包括平场校正、像素比例确定和视场特征描述。此外,我们还使用标准星进行精确的位置和光度校准。此外,我们还创建了一个开源 Python 管道来处理这些鱼眼图像,并利用 Git 和 GitHub 进行源代码版本控制和分发。生成的图像提供了位置和亮度校准的鱼眼夜空视图,光度校准不确定性为 0.12 等。将我们的鱼眼夜空成像仪测量结果与其他校准系统拍摄的图像进行比较时,我们在黑暗和明亮的天空下都能可靠地获得一致的结果。我们的鱼眼夜空成像仪不仅能快速评估天空质量,还能支持建立永久性监测点的可行性。由于认识到自然黑夜是自然、文化、教育和游客体验的关键因素,这一新的相机系统增强了我们评估资源状况的能力,并履行了国家公园管理局的使命,即保护资源不受破坏,供今世后代享用。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Fisheye Night Sky Imager: A Calibrated Tool to Measure Night Sky Brightness
The Night Skies Team of the U.S. National Park Service (NPS) has developed a new camera system equipped with a fisheye lens to measure night sky brightness. This NPS Fisheye Night Sky Imager comprises a back-illuminated Sony IMX455 CMOS sensor housed in the ZWO ASI6200MM camera, a Johnson V filter, and a Sigma 8 mm F3.5 fisheye lens. All of the components are commercially available. The fisheye lens allows us to capture the entire sky in a single frame. The wide-angle view also introduces calibration challenges. To address this, we have customized tools and devised innovative methods for calibrating the system, including flat-field correction, pixel scale determination, and field of view characterization. Additionally, we use standard stars for precise positional and photometric calibration. Furthermore, we create an open-source Python pipeline to process these fisheye images and leverage Git and GitHub for source code version control and distribution. The resulting images provide a positionally and brightness-calibrated fisheye view of the night sky, with a photometric calibration uncertainty of 0.12 mag. When comparing our Fisheye Night Sky Imager measurements to images taken with other calibrated systems, we reliably achieve consistent results under both dark and bright skies. Our Fisheye Night Sky Imager not only enables rapid assessment of sky quality but also supports the feasibility of establishing permanent monitoring locations. Recognizing that the natural dark sky is a critical element for natural, cultural, educational, and visitor experiences, this new camera system enhances our ability to assess resource conditions and fulfill the NPS mission of conserving resources unimpaired for the enjoyment of this and future generations.
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来源期刊
Publications of the Astronomical Society of the Pacific
Publications of the Astronomical Society of the Pacific 地学天文-天文与天体物理
CiteScore
6.70
自引率
5.70%
发文量
103
审稿时长
4-8 weeks
期刊介绍: The Publications of the Astronomical Society of the Pacific (PASP), the technical journal of the Astronomical Society of the Pacific (ASP), has been published regularly since 1889, and is an integral part of the ASP''s mission to advance the science of astronomy and disseminate astronomical information. The journal provides an outlet for astronomical results of a scientific nature and serves to keep readers in touch with current astronomical research. It contains refereed research and instrumentation articles, invited and contributed reviews, tutorials, and dissertation summaries.
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