托勒密、Al Sufi和Tycho星表中的千星星等都被修正为大气消光
The Thousand Star Magnitudes in the Catalogues of Ptolemy, Al Sufi, and Tycho Are All Corrected For Atmospheric Extinction
摘要：
三个望远镜前的星表各包含约1000个星等（星等分别为1、2、3、4、5和6），这些亮度被作为现代星等标度的原始基础。这些目录是托勒密（C。137，从亚历山大在31.2纬度），Al苏菲（c. 960，从伊斯法罕在纬度32.6），和第谷布拉赫（c. 1590年，从Hven岛在纬度55.9）。在此之前，人们对星表中恒星的位置做了大量的工作，但对所报道的星等却很少关注。这些星等将受到各种过程的影响，包括地球大气层的光变暗（大气消光），亮度量化到星等箱中，以及复制或影响先前的星表。本文提供了一个详细的检查这些影响。事实上，我发现所有三个星表都报告了消光效应接近于零的星等，所以旧的观测者以某种方式修正了他们的观测结果。
英文摘要：
Three pre-telescopic star catalogues contain about a thousand star magnitudes each (with magnitudes 1, 2, 3, 4, 5, and 6), with these reported brightnesses as the original basis for what has become the modern magnitude scale. These catalogues are those of Ptolemy (c. 137, from Alexandria at a latitude of 31.2), Al Sufi (c. 960, from Isfahan at a latitude of 32.6), and Tycho Brahe (c. 1590, from the island of Hven at a latitude of 55.9). Previously, extensive work has been made on the positions of the catalogued stars, but only scant attention has been paid to the magnitudes as reported. These magnitudes will be affected by a variety of processes, including the dimming of the light by our Earth's atmosphere (atmospheric extinction), the quantization of the brightnesses into magnitude bins, and copying or influence from prior catalogues. This paper provides a detailed examination of these effects. Indeed, I find all three catalogues to report magnitudes that have near-zero extinction effects, so the old observers in some way extinction corrected their observations.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
