论文标题
走向可见星数的地图集
Toward an atlas of the number of visible stars
论文作者
论文摘要
大气中光污染传播的建模技术允许在天空的任何方向上计算人造夜空亮度的地图，涉及来自卫星数据的大量细节。 Cinzano等。 （2001a）引入了一种基于卫星辐射度测量值和光污染传播的GARSTANG模型，在大面积的天顶绘制肉眼可见性。它考虑了从数字高程数据，基于Garstang进近的天空方向的自然天空亮度，基于Garstang方法，Garstang和Schaefer之后的眼睛能力以及在视觉光度频段中的大气灭绝的每个土地区域的高度。在这里，我们讨论了如何使用这些方法在看夜空半球时获得平均可见星数的地图，最后通过现场回答，即在天空中可见多少颗星的问题。这并不是微不足道的，因为可见的恒星数取决于天空中每个方向的限制幅度，这取决于在该方向上的天空亮度，在那个天顶距离处的大气消失以及观察者的视力和经验。例如，我们向意大利的一张可见恒星数量的图表显示给平均观察者，在晴朗的夜晚，分辨率约为1 km。
Modelling techniques for the propagation of light pollution in the atmosphere allow the computation of maps of artificial night sky brightness in any direction of the sky, involving a large number of details from satellite data. Cinzano et al. (2001a) introduced a method of mapping naked eye star visibility at the zenith from large areas based on satellite radiance measurements and Garstang models of the propagation of light pollution. It takes into account the altitude of each land area from digital elevation data, natural sky brightness in the chosen sky direction based on the Garstang approach, eye capability after Garstang and Schaefer, and atmospheric extinction in the visual photometric band. Here we discuss how to use these methods to obtain maps of the average number of visible stars when looking at the night sky hemisphere, finally answering, site by site, the question of how many stars are visible in the sky. This is not trivial, as the number of stars visible depends on the limiting magnitude in each direction in the sky, and this depends on sky brightness in that direction, atmospheric extinction at that zenith distance and the observer's visual acuity and experience. We present, as an example, a map of the number of visible stars in Italy to an average observer on clear nights with a resolution of approximately 1 km.
