天文学进展2024，Vol.42Issue(2)：362-370,9.DOI:10.3969/j.issn.1000-8349.2024.02.12
上海天文馆双焦点可切换一米望远镜主焦点的天体测量精度评估
Evaluation of Astrometric Performance at the Prime Focus of the Double-focus One-meter Telescope at the Shanghai Astronomy Museum
摘要
Abstract
The Double-focus One-meter Telescope,located at the Wangshu Observatory of the Shanghai Astronomy Museum,is currently the largest aperture telescope dedicated to popular science in China.The telescope adopts a dual-focus design scheme that allows manual switching between the prime and Nasmyth focus.The Nasmyth focus primarily serves visual observations for popular science,while the prime focus is equipped with a scientific-grade CMOS sensor,offering a field of view of 1.5° × 1.1°.The larger field of view is suitable not only for live broadcast events but also for extensive research on various topics such as surveys of novae and supernovae,investigations of small celestial bodies in the solar system,and monitoring of artificial satellites.The astrometric precison at the prime focus of the telescope was analyzed and evaluated based on actual observation data.The results indicate that for star images with a signal-to-noise ratio greater than 5,the repeatability of measured coordinates is better than 0.1 pixel.When the signal-to-noise ratio is 30,the repeatability improves to better than 0.05 pixel.Using the high-precision Gaia DR3 catalog as the reference,the analysis reveals the presence of significant non-linear characteristics in the observation images obtained at the prime focus of the telescope.Consequently,a 3-order model(20-parameter)is necessary for data reduction.For the test observation data,the observational precision for stars brighter than 15th magnitude is approximately 0.05",with the precision decreasing gradually as the magnitude becomes fainter.The observational precision for 17.5th magnitude is around 0.1".关键词
望远镜/底片参数模型/精度分析Key words
telescope/plate parameter model/accuracy analysis分类
天文与地球科学引用本文复制引用
方文奉,杜芝茂,姚迦文,姚嵩,于涌,王磊,单星美,慎露润,王琦,陈振东,林清..上海天文馆双焦点可切换一米望远镜主焦点的天体测量精度评估[J].天文学进展,2024,42(2):362-370,9.基金项目
国家重点研发计划(2022YFE0116800) （2022YFE0116800）
国家自然科学基金(12073062) （12073062）
