当前位置: X-MOL 学术LEUKOS › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
On the Relation between the Astronomical and Visual Photometric Systems in Specifying the Brightness of the Night Sky for Mesopically Adapted Observers
LEUKOS ( IF 3.6 ) Pub Date : 2021-06-25 , DOI: 10.1080/15502724.2021.1921593
Irena Fryc 1 , Salvador Bará 2 , Martin Aubé 3 , John C. Barentine 4, 5 , Jaime Zamorano 6
Affiliation  

ABSTRACT

Due to the typical ambient light levels in inhabited places and light pollution of the night sky, most naked-eye astronomical observations are performed nowadays under mesopic conditions. The luminance (cd/m2) associated with the brightness of the night sky specified in the astronomical logarithmic scale of magnitudes per square arcsecond (mag/arcsec2) is strongly dependent on the spectrum of the sky, because the spectral sensitivity of the human visual system is not coincident with the standard photometric bands used in astronomy. The conversion between these two families of photometric systems was previously analyzed for observers presumed to be either fully photopically or scotopically adapted. In this work, we deduce the transformation equations between the astronomical and visual photometric systems for specifying and reporting the sky brightness in the mesopic range, within the framework of the MES-2 system for visual performance-based mesopic photometry. It is shown that the dependence of the conversion factors on the correlated color temperature of the night sky reaches a minimum spread for adaptation luminances of 0.5–1.0 cd/m2. The sky luminances corresponding to 22.0 mag/arcsec2 in the Johnson-Cousins V band (the assumed brightness of a natural night sky devoid of light pollution) span, for 1.0 cd/m2 adaptation, a relatively small range of ~195–215 μcd/m2 in the absolute (AB) magnitude system and ~210–225 μcd/m2 in the Vega-referenced one.



中文翻译:

天文光度系统与视觉光度系统在确定中观观测者夜空亮度中的关系

摘要

由于有人居住地的典型环境光照水平和夜空的光污染,现在大多数肉眼天文观测都是在中间条件下进行的。与夜空亮度相关的亮度 (cd/m 2 ),以每平方弧秒 (mag/arcsec 2 ) 星等的天文对数标度指定) 强烈依赖于天空的光谱,因为人类视觉系统的光谱灵敏度与天文学中使用的标准光度波段不一致。这两个测光系统家族之间的转换先前已针对假定完全适应光或暗适应的观察者进行了分析。在这项工作中,我们在用于基于视觉性能的中间光度测量的 MES-2 系统的框架内,推导出了天文和视觉光度系统之间的转换方程,用于指定和报告中间范围内的天空亮度。结果表明,对于 0.5–1.0 cd/m 2的适应亮度,转换因子对夜空相关色温的依赖性达到最小扩展. 对应于 Johnson-Cousins V 波段中 22.0 mag/arcsec 2的天空亮度(假定没有光污染的自然夜空的亮度)跨度为 1.0 cd/m 2适应,相对较小的范围约为 195-215 μcd/m 2在绝对(AB)幅度系统中,在 Vega 参考系统中约为 210–225 μcd/m 2

更新日期:2021-06-25
down
wechat
bug