Data set for "Case study of developing an affordable undergraduate observatory" and image of M51 galaxy

A series of photographs taken of Messier object M51 the Whirlpool galaxy that can be combined to produce a final astro-photograh of M51 as shown in the associated research paper.一系列对梅西耶天体M51，即漩涡星系的摄影作品，这些照片可组合生成最终的天文摄影图像，正如相关研究论文中所展示。